Pressure relief device with conductive trace sensor formed thereon

Abstract

An overpressure relief device includes a pressure relief member and a rupture indicator. The pressure relief member includes a central rupturable section and an outer flange section surrounding the central section. The rupture indicator includes an electrically insulating substrate and an electrically conductive trace. The substrate is operatively associated with the outer flange section and includes a cantilevered tab that extends above and is spaced apart from a surface of the central section. The trace is located on the substrate and extends onto a portion of the tab. The trace defines an electrical circuit capable of conducting an electrical signal and is operable to detect a process condition associated with the overpressure relief device.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 597,805, filed November 10, 2023, which is incorporated herein by reference in its entirety. Background of the Invention Technical Field

[0003] The present invention generally relates to a pressure relief device including circuitry for sensing operating conditions associated with the device. Specifically, the circuitry includes a conductive trace extending over and spaced from a central portion of the pressure relief device. The conductive trace is positioned on a fractured substrate, which is capable of fracture and thus at least partially affects the continuity of the trace. Background Technology

[0004] Burst indicators are typically used in conjunction with fragmentation monitoring systems to alert operators when a fragmentation device (FCD) bursts, allowing investigation of the overpressure condition leading to the burst and subsequent FCD replacement. Traditionally, burst indicators consist of a simple circuit encapsulated in a non-conductive material, such as a Kapton film, and placed directly against the FCD. When the FCD bursts, the circuitry is interrupted, causing the monitoring system to alert the operator. U.S. Patent No. 8,354,934 discloses one such conventional burst indicator.

[0005] These traditional rupture indicator designs have drawbacks that limit their use in certain systems. First, when installing the rupture indicator along with the rupture disc, traditional designs require multiple installation steps and several installation technicians. For example, installing the rupture disc into a piping system requires a plumber, while installing the rupture indicator requires an electrician. Second, traditional rupture indicators are typically constructed as laminates using adhesives. These adhesives are often temperature-sensitive and can begin to degrade when exposed to slightly elevated temperatures. For example, some traditional rupture indicators include circuitry sandwiched between multiple layers of Kapton film held together by adhesives. At temperatures of 200°F or higher, the adhesives constituting the rupture indicator may decompose, causing the Kapton film to delaminate and exposing the conductive material that makes up the circuitry. Furthermore, when used in low-pressure systems, the energy delivered by the rupture disc flaps may not be sufficient to tear the Kapton film rupture indicator and signal its breakage.

[0006] Some traditional blast indicators include thin-trace circuitry that can be applied directly to a non-conductive film on a vent. When the vent is opened, the film tears, cutting off the circuitry within the blast indicator and triggering an alarm. However, such blast indicators operate in a temperature range of approximately 150-250°C. This is incompatible with explosion-proof vents that can withstand high temperatures (400-600°C). Therefore, an integrated blast indicator capable of operating at extremely high temperatures is needed. Summary of the Invention

[0007] According to one embodiment of the present invention, an overpressure relief device is provided, including a pressure relief member and a burst indicator. The pressure relief member includes a central burstable section and an outer flange section surrounding the central section. The burst indicator includes an electrically insulating substrate and a conductive trace. The substrate is operatively associated with the outer flange section and includes an overhanging tab extending from and spaced from the surface of the central section. The trace is located on the substrate and extends onto a portion of the tab. The trace defines circuitry capable of conducting electrical signals and is operable to detect process conditions associated with the overpressure relief device.

[0008] According to another embodiment of the invention, a rupture indicator is provided for detecting a process condition associated with an overpressure relief device having a central ruptureable section and an outer flange section surrounding the central section. The rupture indicator includes an electrically insulating substrate and conductive traces. The electrically insulating substrate is configured to be operatively associated with the outer flange section and includes an overhanging tab configured to extend from the substrate over and spaced from a surface of the central section. The conductive traces are located on the substrate and extend onto a portion of the tabs. The traces define circuitry capable of conducting electrical signals and are operable to detect a process condition associated with the overpressure relief device.

[0009] According to another embodiment of the present invention, a method for detecting the opening of a pressure relief device is provided. The method includes installing the pressure relief device within a structure to be protected against an overpressure condition. The pressure relief device includes a pressure relief member and a rupture indicator. The pressure relief member includes a central ruptureable section and an outer flange section surrounding the central section. The rupture indicator includes an electrically insulating substrate and a conductive trace. The electrically insulating substrate is operatively associated with the outer flange section and includes an overhanging tab extending from and spaced from the surface of the central section. The conductive trace is located on the substrate and extends onto a portion of the tab. The trace defines a circuit capable of conducting electrical signals and is operable to detect a process condition associated with the overpressure relief device. The method further includes: detecting a circuit break when an overpressure condition reaching a predetermined threshold causes the central section to rupture and form a flap that contacts and breaks the tab on the rupture indicator, thereby cutting off the circuit; and issuing an alarm.

[0010] According to another embodiment of the invention, an overpressure relief device is provided, including a pressure relief member and a rupture indicator. The pressure relief member includes a central ruptureable section and an outer flange section surrounding the central section. The rupture indicator includes a flexible substrate, a conductive trace, and a rigid member. The substrate is operatively associated with the outer flange section and includes an overhanging end extending over and spaced from a surface of the central section. The trace is located on the substrate and extends over at least a portion of the overhanging end, defining a circuit capable of conducting electrical signals. The rigid member is operatively associated with the substrate and extends over that portion of the overhanging end, covering the trace, such that when the central section ruptures to form a flap, the flap contacts and deforms the overhanging end, causing the rigid member to contact the trace, thereby affecting the circuit.

[0011] According to another embodiment of the invention, a rupture indicator is provided for detecting process conditions associated with an overpressure relief device having a central ruptureable section and an outer flange section surrounding the central section. The rupture indicator includes a flexible substrate, a conductive trace, and a rigid member. The substrate is configured to be operatively associated with the outer flange section and includes an overhanging end configured to extend over and spaced from a surface of the central section. The trace is located on the substrate and extends over at least a portion of the overhanging end, defining a circuit capable of conducting electrical signals. The rigid member is operatively associated with the substrate and extends over that portion of the overhanging end to cover the trace, such that when the central section ruptures to form a flap, the flap contacts and deforms the overhanging end, causing the rigid member to contact the trace, thereby affecting the circuit.

[0012] According to another embodiment of the present invention, a method for detecting the opening of a pressure relief device is provided. The method includes installing the pressure relief device within a structure to be protected against an overpressure condition. The pressure relief device includes a pressure relief member and a rupture indicator. The pressure relief member includes a central ruptureable section and an outer flange section surrounding the central section. The rupture indicator includes a flexible substrate, a conductive trace, and a rigid member. The substrate is operatively associated with the outer flange section and includes an overhang extending over and spaced from a surface of the central section. The trace is located on the substrate and extends over at least a portion of the overhang, defining a circuit capable of conducting an electrical signal. The rigid member is operatively associated with the substrate and extends over that portion of the overhang, covering the trace. The method further includes: detecting a circuit breakage when an overpressure condition reaching a predetermined threshold causes the central section to rupture and form a flap that contacts and deforms the overhang, causing the rigid member to contact the trace, thereby breaking the circuit; and issuing an alarm. Attached Figure Description

[0013] Figure 1 This is a top perspective view of a pressure relief device according to an embodiment of the present invention; Figure 2 yes Figure 1 A bottom-view perspective view of the device shown. Figure 3 yes Figure 1 An enlarged cross-sectional view of the device shows the relative positioning of the rupture indicator and the pressure relief component; Figure 4 yes Figure 3 A perspective view of the crack indicator is shown, with its top cover removed, revealing the conductive traces of the crack indicator. Figure 5 yes Figure 3 An exploded view of the selected components of the fracture indicator shown; Figure 6 yes Figure 3 An exploded view of a selected component of the pressure relief mechanism shown. Figure 7 yes Figure 1 An enlarged sectional view showing the operably associated equipment and piping assembly illustrates the equipment in normal operating condition. Figure 8 yes Figure 1 An enlarged cross-sectional view of the equipment and piping assembly shown indicates that the equipment is in a rupture operation state. Figure 9 This is an enlarged cross-sectional view of a pressure relief device with a rupture indicator according to another embodiment of the present invention; Figure 10 yes Figure 9 A perspective view of the fracture indicator is shown, with its top cover removed, revealing the rigid components of the fracture indicator. Figure 11 yes Figure 9 An exploded perspective view of the optional components of the fracture indicator shown; Figure 12 yes Figure 9 The cross-sectional view of the pressure relief device shown illustrates the relative positioning of the tongue of the rigid member and the overhanging end of the rupture indicator base. Figure 13 yes Figure 9 The enlarged view of the pressure relief device shown indicates that the device is in normal operating condition. Figure 14 yes Figure 9 An enlarged view of the pressure relief device shown indicates that the device is in a rupture operation state; and Figure 15 This is a flowchart illustrating exemplary steps of a method according to an embodiment of the present invention. Detailed Implementation

[0014] In one embodiment of the present invention, an overpressure relief device 10 is provided, such as... Figure 1As shown. The device includes circuitry operable to detect conditions associated with the overpressure relief device, including but not limited to the rupture or non-rupture of a rupture disc or vent plate. In some embodiments, conditions associated with the overpressure relief device can be detected by at least partially disconnecting the circuit, for example by a change in circuit resistance, or by a complete disconnection resulting in an open circuit. Any change in resistance (including an open circuit) can alter the electrical signal carried by the circuit, which can be detected by appropriate signal detection equipment.

[0015] Go to Figure 1 The overpressure relief device 10 includes a pressure relief member 12 and a burst indicator 14. The pressure relief member 12 includes a central fracturing section 16 and an outer flange section 18. In one or more embodiments, the pressure relief member 12 may be formed of any suitable metal or alloy suitable for a particular application. In some embodiments, the overpressure relief device 10 will be used in high-temperature or highly corrosive applications. In these applications, the member 12 may be formed of a heat-resistant alloy, such as stainless steel, INCONEL, or HASTALLOY. The member 12 is depicted as a positively acting fracturing disc, wherein the fracturing central section 16 includes a raised region 20. In such embodiments, the opposite face of the central section 16 includes a concave surface 22 (e.g., Figure 2 (as shown) and convex surface 24. However, it should be understood that other types of overpressure relief devices may be used without departing from the concept of the invention. For example, in some embodiments, component 12 may be a raised positive-acting rupture disc or ventilation plate, a flat rupture disc or ventilation plate, etc.

[0016] Go to Figure 6 In one or more embodiments, component 12 includes a rupture disc 28 and a rupture indicator holder 40. The rupture disc 28 includes a central ruptureable segment 16 and a rupture disc flange 42 surrounding the central segment 16. The rupture disc 28 includes an opening line 44 formed in a convex surface 24, which defines a bursting area of ​​the central ruptureable segment 16. The opening line 44 includes an opening line recess extending from surface 24 toward surface 22. The opening line 44 can include virtually any desired configuration. However, in some embodiments, the opening line 44 may be substantially C-shaped, thereby forming a single flap when component 12 is opened. Component 12 may optionally include an opening initiation point 46 disposed along or near the opening line 44 and generally opposite a hinge region 48 defined between the ends 50, 52 of the opening line 44. The opening line 44 can be formed by any process known to those skilled in the art, including die stamping, chemical electropolishing, mechanical milling, or laser processing. Preferably, the opening line 44 is formed in the central fractured section 16 after at least a pre-protrusion or final protrusion operation.

[0017] The breakage indicator retainer 40 is part of the flange section 18 and defines a slot 60 operable to receive the breakage indicator 14. The breakage indicator retainer 40 includes a first section 62 having two mating ends 64, 66 that mate with a second section 68. The second section includes two parts 70, 72, each including complementary ends 74, 76 that mate with the mating ends 64, 66 of the first section 62. The two parts 70, 72 of the second section 68 also include slot ends 78, 80 defining the slot 60 and including female mating structures 82, 84, such as a bearing, recess, indentation, hole, etc., for partially mating with and retaining the breakage indicator 14. The slot ends 78, 80 also include tabs 86, 88 projecting radially outward from the central breakable section 16 (e.g., Figure 3 (As shown). The two parts 70 and 72 in the second section enable quick replacement of the crack indicator 14. Specifically, the crack indicator 14 can be replaced simply by removing the fasteners used to secure the two parts 70 and 72.

[0018] Go to Figure 3 The fracture indicator 14 is operable to be placed within the slot 60 of the member 12 such that the outer top surface 90 of the fracture indicator 14 is flush with the top surface 92 of the fracture indicator holder 40 (e.g., Figure 1 and Figure 7 (As shown). The breakage indicator 14 includes male mating structures 94, 96, such as tabs, knobs, keys, etc., which are complementary to the mating structures 82, 84 of the retainer 40. In one or more embodiments, the mating structures 94, 96 of the breakage indicator 14 may be male and / or female, and the mating structures 82, 84 of the retainer 40 may be male and / or female.

[0019] Go to Figure 4 and Figure 5The breakage indicator 14 includes a substrate 100 and conductive traces 122 located on the substrate 100. In one or more embodiments, the breakage indicator 14 includes a housing assembly 98 encapsulating at least a portion of the substrate 100. The housing assembly 98 includes a bottom cover 102, one or more spacers 104, 106, and a top cover 108. The bottom cover 102 supports the substrate 100 and includes one or more flexible tabs 110 operable to engage one or more conductors 112, 114. The bottom cover 102 may be made of metal, such as stainless steel. The spacers 104, 106 are positioned on the bottom cover 102 and abut at least a portion of the substrate 100. In one or more embodiments, the housing assembly 98 includes a substrate clip 116 that holds the substrate 100 against the bottom cover 102. The clip 116 may include an electrically insulating material and may adhere to the bottom cover 102 above the substrate 100. The top cover 108 covers the spacers 104 and 106 to enclose a portion of the base 100. Similar to the bottom cover 102, the top cover 108 can be made of metal, such as stainless steel.

[0020] The base 100 is operatively associated with the outer flange section 18 via the housing assembly 98 and the retainer 40, and includes a tab 118. Go to Figure 7 When the device 10 is installed within a structure 11 to be protected from overpressure conditions, the tab 118 is overhanging and extends over and spaced from the surface 24 of the central section 16. The structure 11 may be one or more walls or roofs of a piping system, ventilation duct, facility, or chamber. The overpressure condition may be related to a predetermined threshold, which may be the pressure at which the pressure relief member 12 is configured to rupture.

[0021] In one or more embodiments, the tab 118 extends radially inward from the flange section 18 along the central axis toward the central fractured section 16. The tab 118 extends across the opening line 44. In one or more embodiments, the tab 118 extends inward from the opening line from about 3 mm to about 6 mm, and in a preferred embodiment, from about 4 mm to about 5 mm. In one or more embodiments, the substrate 100 is made of a brittle material, such as ceramic or glass, such that when the central section 16 breaks to form a flap 120, the breaking action of the flap breaks the tab 118 from the rest of the substrate 100, such as... Figure 8 As shown.

[0022] Back Figure 5Conductive trace 122 is located on substrate 100 and extends onto at least a portion of tab 118. Trace 122 defines circuitry capable of conducting electrical signals and operable to detect process conditions associated with overpressure relief device 10. Wires 112, 114 are electrically connected to trace 122 via pads. However, wires 112, 114 can be connected to trace 122 in various ways without departing from the scope of the invention. In one or more embodiments, trace 122 is disposed on upper surface 124 of substrate 100. Trace 122 can be made of any transition metal, such as silver, gold, copper, aluminum, iron, titanium, platinum, or tungsten. In addition to these materials, trace 122 may also comprise conductive nonmetals, such as carbon particles or semiconductive metals, such as silicon or doped silicon. Trace 122 may also comprise conductive polymer ink.

[0023] In one or more embodiments, a non-conductive coating is applied to at least a portion of the surface of substrate 100. For example, the non-conductive coating may be applied to trace 122. In some embodiments, the non-conductive coating is applied in liquid or paste form and cured in situ without an intermediate binder composition. The non-conductive coating may include a non-conductive paint, primer, or ink. In some embodiments, the coating may include a non-conductive etching primer. In other embodiments, the non-conductive coating includes a UV-curable material that is applied and cured in situ by exposure to UV radiation. The non-conductive coating may be formulated to maximize adhesion to the surfaces of substrate 100 and / or trace 122. Exemplary non-conductive coatings may include non-conductive metal oxides (such as titanium dioxide compounds), non-conductive polymers, ceramics, epoxy components, silicone rubber, or PARYLENE (parylene polymer). In some embodiments, the non-conductive coating is applied using inkjet printing technology, although other types of printing technologies, such as screen printing, photolithography, etc., may also be used. Because the substrate 100 and the trace 122 are spaced apart from the heated surface 24 of the central section 16, and because they are preferably made of a high-melting-point material, the crack indicator 14 is capable of withstanding extremely high temperatures. As used herein, "withstanding" means that the trace 122 maintains a certain level of conductivity at the required maximum operating temperature. Specifically, the crack indicator 14 can operate at temperatures from at least 400°C to 700°C. In one or more embodiments, the crack indicator 14 can operate at temperatures from at least 500°C to up to 700°C. In a preferred embodiment, the crack indicator 14 can operate at temperatures from at least above 600°C to up to 700°C.

[0024] A rupture indicator 14A constructed according to another embodiment of the present invention is shown in Figure 9The fracture indicator 14A may include components substantially similar to those in the fracture indicator 14; therefore, components in the fracture indicator 14A corresponding to similar components in the fracture indicator 14 are marked with 'A' after their reference numerals.

[0025] The rupture indicator 14A is similarly operable to be positioned within the slot 60 of the member 12 such that the outer surface 90A of the rupture indicator 14A is flush with the top surface 92 of the rupture indicator holder 40. The rupture indicator 14A also includes mating structures 94A, 96A for engaging with the holder 40.

[0026] Go to Figure 10 The rupture indicator 14A includes a flexible substrate 102A, a trace 122A disposed on the substrate 102A, and a rigid member 100A positioned on the substrate 102A for contacting the trace 122A when the substrate 102A is bent by the action of the flap 120. In one or more embodiments, the rupture indicator 14A further includes a housing assembly comprising spacers 104A, 106A and a top cover 108A, which cooperatively encapsulate at least a portion of the trace 122A and / or the rigid member 100A.

[0027] Go to Figure 11 The base 102A includes a cantilever end 126 that extends over and is spaced apart from the surface 24 of the central section 16 (e.g., Figures 12 to 14 (As shown). In one or more embodiments, the overhang 126 includes a lip 128 that extends downward toward the surface 24 of the central fractured section 16 (as shown). Figure 12 (As best shown). The lip 128 helps ensure that the overhanging end 126 is contacted by the flap 120 (as shown). Figure 14 (as shown) and bend upwards (as shown) Figure 12 (As indicated by the middle arrow) to ensure that the rigid member 100A contacts the trace 122A. In one or more embodiments, the lip 128 extends orthogonally relative to the remainder of the substrate 102A.

[0028] In one or more embodiments, the overhang 126 includes one or more weakened regions, such as orifices 130, 132, which are operable to help the rigid member 100A influence the trace 122A and / or help ensure that the overhang 126 bends in a desired manner. While the weakened regions are depicted as orifices 130, 132, they can be thinned regions, recesses, slits, etc., without departing from the scope of the invention. The orifices 130, 132 may be sized to accommodate at least a portion of the rigid member 100A. Specifically, the orifices 130, 132 may have a width corresponding to a portion of the rigid member 100A operable to contact the overhang 126, such that in some embodiments, when the overhang 126 bends, that portion of the rigid member 100A extends through the orifices 130, 132.

[0029] In one or more embodiments, orifices 130, 132 may be located on opposite sides of a length of trace 122A to define bridging portion 134. Bridging portion 134 may include one or more laterally extending portions 136, 138 operable to be partially contacted by rigid member 100A when flap 120 bends overhang end 126. Rigid member 100A engages laterally extending portions 136, 138, causing bridging portion 134 to rotate relative to the remainder of overhang end 126, resulting in trace 122A and / or at least a portion of bridging portion 134 being sheared off from the remainder of overhang end 126.

[0030] In one or more embodiments, the substrate 102A comprises a metal, such as copper, aluminum, stainless steel, etc. The substrate 102A may also include an electrically insulating film on which the trace 122A is disposed. The non-conductive coating may be any of the aforementioned non-conductive coatings and may be applied to at least a portion of at least one surface of the substrate 102A and / or the trace 122A.

[0031] Conductive trace 122A is located on substrate 102A and extends to at least a portion of overhang end 126. In one or more embodiments, trace 122A extends through bridging portion 134 on overhang end 126. Trace 122A may also extend along a path outside the area supported by rigid member 100A and spacers 104A, 106A on substrate 102A.

[0032] A rigid member 100A is operatively associated with a substrate 102A and extends over a cantilever end 126 to cover a trace 122A, such that when the central segment 16 breaks to form a flap 120, the flap 120 contacts and bends the cantilever end 126, causing the rigid member 100A to contact the trace 122A, thereby affecting the circuit defined by the trace 122A. This effect on the circuit can include a variety of effects without departing from the scope of the invention. For example, it can affect the continuity, resistance, capacitance, inductance, or reflectivity of the circuit. The rigid member 100A includes a body portion 140 and a tongue 142 extending from the body portion 140 across a portion of the trace 122A. In one or more embodiments, the body portion 140 is positioned on the substrate 102A, and the tongue 142 extends across a portion of the trace 122A such that the tongue 142 is spaced apart from that portion of the trace 122A. This prevents the tongue 142 from rubbing against this portion of the trace 122A when installed in a vibration-prone system, which could otherwise cause the trace 122A to wear, creating an open circuit and triggering a false alarm.

[0033] Go to Figure 12 In one or more embodiments, the tongue 142 extends from the body portion 140 at an angle relative to the overhanging end 126 (in the normal operating position), such that the tongue 142 is positioned above the bridging portion 134 and the trace 122A portion on the bridging portion 134. This ensures that the tongue 142 only contacts the trace 122A when the overhanging end 126 is pushed upward by the flap 120 in the direction indicated by the arrow. Figure 13 As shown, under normal operating conditions, the cantilever end 126 extends beyond the central fractured section 16, and the tongue 142 is positioned above a portion of the cantilever end 126. Figure 14 As shown, when the central segment 16 ruptures and the flap 120 forms, the flap 120 forces the overhanging end 126 to bend upward relative to the remainder of the base 102A, causing the tongue 142 to contact the bridging portion 134 and cut off a portion of the trace 122A on the bridging portion 134. This results in an open circuit that can be detected by appropriate signal detection equipment.

[0034] A rupture indicator 14B constructed according to another embodiment of the present invention is shown in Figure 15 The fracture indicator 14B may include components substantially similar to those in the fracture indicator 14A; therefore, components in the fracture indicator 14B corresponding to similar components in the fracture indicator 14A are marked with 'B' after their reference numerals.

[0035] Similarly, the fracture indicator 14B is operable to be positioned within the slot 60 of the member 12 such that the outer surface 90B of the fracture indicator 14B is flush with the top surface 92 of the fracture indicator holder 40. (Go to...) Figure 16The breakage indicator 14B is basically the same as the breakage indicator 14A, except that the bottom cover 102B has a single opening 130B (as shown in the image). Figure 17 As shown), the tongue 142B includes a tip 144, and the breakage indicator 14B also includes a fragile base 146 covering the bottom cover 102B. Figure 16 The image depicts the situation after the top cover 108B has been removed from the remainder of the breakage indicator 14B. Rigid member 100B and spacers 104B, 106B cover the base 146. Rigid member 100B is arranged such that the tip 144 of the tongue 142B is spaced apart from a portion 134B of the trace 122B and extends beyond that portion. Tip 144 is depicted as having a triangular prism shape; however, tip 144 may have various shapes without departing from the scope of the invention.

[0036] Go to Figure 17 A fragile base 146 is fixed to a bottom cover 102B. A trace 122B is disposed on the base 146. The base 146 is arranged relative to the bottom cover 102B such that a portion 134B of the trace 122B below the tip 144 extends over the orifice 130B of the bottom cover 102B. The tip 144 of the tongue 142B is operable to respond to a breakage event (such as...) Figure 20 (As shown) When the tongue 142B extends into the orifice 130B of the base cover 102B, it tears a portion 134B of the trace 122B. In one or more embodiments, the base 146 includes a pair of orifices 148, 150 on either side of the portion 134B of the trace 122B, for assisting the tip 144 in tearing the base 146 and thus the portion 134B of the trace 122B between the orifices 148, 150. This results in an open circuit in the trace 122B, thereby triggering an alarm. Although Figure 17 A pair of circular apertures 148, 150 are depicted, but without departing from the scope of the invention, the substrate 146 may include any number of apertures of any shape. In one or more embodiments, the substrate 146 does not include any apertures.

[0037] Go to Figure 18 Similarly, the tongue 142B of the rigid member 100B is angled relative to the rest of the rigid member 100B, such that under normal operating conditions (e.g. Figure 19As shown), it is spaced apart from a portion 134B of the trace 122B below. During a rupture event, the bottom cover 102B bends upward (as indicated by the arrow), causing the base 146 to strike the tip 144 of the tongue 142B. When the base 146 strikes the tip 144, the base 146 and / or the portion 134B of the trace 122B are altered to indicate a rupture event. In some embodiments, when the base 146 strikes the tip 144, the tip 144 of the tongue 142B pierces the base 146 and / or the trace 122B and extends into the orifice 130B of the bottom cover 102B (as shown by the arrow). Figure 20 (As shown).

[0038] Figure 21 The flowchart depicts the steps of an exemplary method 200 for detecting the opening of a pressure relief device. In some alternative embodiments, the functions indicated in the various boxes may be related to... Figure 15 The different sequences of events described in the text occur. For example, Figure 21 The two boxes shown consecutively can actually be executed substantially simultaneously, or these boxes can sometimes be executed in reverse order depending on the functions involved. Furthermore, some steps can be optional.

[0039] For ease of reference, method 200 is described below as a combination of Figures 1 to 20 The exemplary devices and components described in the illustrated embodiments are used for execution. Some steps of method 200 can be performed using signal detection equipment with one or more control panels having circuitry, a processor, a transceiver, hardware, software, firmware, or a combination thereof. However, some of these actions may be distributed differently among such devices or other devices without departing from the spirit of the invention.

[0040] Referring to step 201, the pressure relief device is installed within the structure to be protected from overpressure conditions. This structure may be one or more walls or roofs of a piping system, ventilation duct, facility, or chamber. In one or more embodiments, the structure to be protected involves exposure to extremely high temperatures, such as at least 400°C to 700°C, at least 500°C and up to 700°C, or at least above 600°C and up to 700°C. The pressure relief device may include embodiments of pressure relief device 10 discussed above, having one or more rupture indicators, such as rupture indicators 14, 14A, 14B. The pressure relief device may be installed such that the overhanging tab 118 or overhanging end 126 is located on one side of the device, in the direction in which the flap is pushed outward during an overpressure condition.

[0041] Referring to step 202, a break in the circuit trace of the rupture indicator of the pressure relief device is detected. The circuit break can be caused by a ruptured flap breaking the tab 118 of the base 100, or by the flap bending the overhanging end 126 of the base 102A (or bottom cover 102B), causing the rigid members 100A, 100B to tear the bridging portion 134 (or portion 134B of the trace 122B on the base 146). Without departing from the scope of the invention, the circuit break can be detected in various ways. For example, a suitable signal detection device electrically connected to a wire (which in turn is electrically connected to the trace of the rupture indicator) can be used to check the continuity, resistance, capacitance, inductance, reflectivity, or other electrical characteristics of the trace.

[0042] Refer to step 203 to issue an alarm. The alarm can be triggered by signal detection equipment.

[0043] Method 200 may include additional, fewer, or alternative steps and / or (one or more) devices, including those discussed elsewhere in this document.

Claims

1. An overpressure relief device, comprising: A pressure relief member, the pressure relief member comprising a central fracturing section and an outer flange section surrounding the central section; as well as A fracture indicator, the fracture indicator comprising: An electrically insulating substrate, operatively associated with the outer flange segment and including an overhanging tab extending over and spaced from the surface of the central segment; as well as A conductive trace is located on the substrate and extends to at least a portion of the tab, the trace defining a circuit capable of conducting electrical signals, the circuit being operable to detect process conditions associated with the overpressure relief device.

2. The overpressure relief device according to claim 1, characterized in that, The substrate includes at least one of ceramic or glass.

3. The overpressure relief device according to claim 1, characterized in that, The rupture indicator also includes a casing assembly that encapsulates at least a portion of the substrate, the casing assembly having an outer surface flush with the surface of the outer flange segment.

4. The overpressure relief device according to claim 3, characterized in that, The outer flange section includes a rupture indicator retainer configured to cover the pressure relief member and includes a slot configured to receive the rupture indicator.

5. The overpressure relief device according to claim 3, characterized in that, The enclosure assembly includes: A bottom cover that supports the base and includes one or more flexible tabs operable to engage one or more wires; One or more spacers, said spacers being positioned on the bottom cover and adjacent to at least a portion of the base; and A top cover that covers the one or more spacers.

6. The overpressure relief device according to claim 1, characterized in that, The traces include silver.

7. The overpressure relief device according to claim 1, characterized in that, The substrate and the traces are capable of withstanding temperatures of at least 400°C.

8. The overpressure relief device according to claim 7, characterized in that, The substrate and the traces are capable of withstanding temperatures of at least 500°C.

9. The overpressure relief device according to claim 1, characterized in that, The tabs of the substrate extend radially inward from the flange section along the central axis toward the central fractured section.

10. The overpressure relief device according to claim 9, characterized in that, The central fractured section includes an opening line formed thereon, and the tab includes a portion extending beyond the opening line.

11. The overpressure relief device according to claim 10, characterized in that, The opening line is formed on the outer edge of the central fractured section, and the portion extends inward from the opening line by about 3 mm to about 6 mm.

12. The overpressure relief device according to claim 1, characterized in that, The central section is convex and includes a pair of opposing surfaces, the pair of opposing surfaces being a convex surface and a concave surface.

13. The overpressure relief device according to claim 1, characterized in that, The pressure relief component is a ventilation plate.

14. A burst indicator for detecting a process condition associated with an overpressure relief device, the overpressure relief device having a central burstable section and an outer flange section surrounding the central section, the burst indicator comprising: An electrically insulating substrate, the electrically insulating substrate being configured to be operatively associated with the outer flange segment and including an overhanging tab, the tab being configured to extend from the substrate to and be spaced apart from the surface of the central segment; as well as A conductive trace is located on the substrate and extends to at least a portion of the tab, the trace defining a circuit capable of conducting electrical signals, the circuit being operable to detect process conditions associated with the overpressure relief device.

15. The rupture indicator according to claim 14, characterized in that, The substrate includes at least one of ceramic or glass.

16. The rupture indicator according to claim 14, characterized in that, Also includes: A bottom cover that supports the base and includes one or more flexible tabs operable to engage one or more wires; One or more spacers, said one or more spacers being positioned on the bottom cover and adjacent to at least a portion of the base; as well as A top cover that covers the one or more spacers.

17. The rupture indicator according to claim 14, characterized in that, The traces include silver.

18. The rupture indicator according to claim 14, characterized in that, The tab includes a first surface configured to face the central segment and a second surface opposite to the first surface, and the trace is disposed on the second surface.

19. A method for detecting the opening of a pressure relief device, the method comprising: The pressure relief device is installed within a structure to be protected from overpressure conditions, and the pressure relief device includes: A pressure relief member, the pressure relief member comprising a central fracturing section and an outer flange section surrounding the central section; and A fracture indicator, the fracture indicator comprising: An electrically insulating substrate, operatively associated with the outer flange segment and including an overhanging tab extending from the substrate over and spaced from the surface of the central segment; and A conductive trace is located on the substrate and extends to at least a portion of the tab, the trace defining a circuit capable of conducting electrical signals, the circuit being operable to detect process conditions associated with the pressure relief device; When an overvoltage condition reaching a predetermined threshold causes the central section to rupture and form a flap, a circuit break is detected. The flap contacts and breaks the tab on the rupture indicator, thereby cutting off the circuit. Issue an alarm.

20. The method according to claim 19, characterized in that, The trace includes a first terminal and a second terminal electrically connected to the first terminal.

21. The method according to claim 20, characterized in that, Detecting the circuit's disconnection includes sending a signal to the first terminal.

22. The method according to claim 21, characterized in that, The signal includes a first voltage, and detecting the interruption of the circuit includes comparing the first voltage with a second voltage at the second terminal.

23. The method according to claim 19, characterized in that, Detecting the interruption of the circuit includes detecting the electrical characteristics of the circuit.

24. The method according to claim 23, characterized in that, The electrical characteristics include at least one of resistance, capacitance, inductance, reflectivity, open circuit indication, or closed circuit indication.

25. An overpressure relief device, comprising: A pressure relief member, the pressure relief member comprising a central fracturing section and an outer flange section surrounding the central section; as well as A fracture indicator, the fracture indicator comprising: A flexible substrate, operatively associated with the outer flange segment and including an overhanging end that extends over and is spaced apart from the surface of the central segment; A conductive trace, the conductive trace being located on the substrate and extending to at least a portion of the overhang, the trace defining a circuit capable of conducting electrical signals; and A rigid member operatively associated with the substrate and extending over at least a portion of the overhanging end to cover the trace, such that when the central segment breaks to form a flap, the flap contacts and deforms the overhanging end, causing the rigid member to contact the trace, thereby affecting the circuit.

26. The overpressure relief device according to claim 25, characterized in that, The substrate includes stainless steel.

27. The overpressure relief device according to claim 25, characterized in that, The rigid member includes a main body portion positioned on the base and a tongue portion extending from the main body portion across the trace, such that the tongue portion maintains a spaced relationship with the trace.

28. The overpressure relief device according to claim 27, characterized in that, The tongue extends from the body portion at an angle relative to the trace and the base.

29. The overpressure relief device according to claim 25, characterized in that, The overhang includes one or more weakened regions that are operable to help the rigid member influence the circuit.

30. The overpressure relief device according to claim 29, characterized in that, The one or more weakened regions include one or more apertures extending through the substrate.

31. The overpressure relief device according to claim 30, characterized in that, The one or more weakened regions include a first orifice and a second orifice, the first orifice being sized to accommodate a portion of the rigid member and located on a first side of the trace, and the second orifice being sized to accommodate the portion of the rigid member and located on a second side of the trace opposite to the first side.

32. The overpressure relief device according to claim 31, characterized in that, The first orifice and the second orifice define a bridging portion, which is positioned below the portion of the rigid member and supports a length of the trace.

33. The overpressure relief device according to claim 32, characterized in that, The bridging portion includes a laterally extending portion operable to contact the portion of the rigid member when the flap bends the overhanging end, such that the contact between the laterally extending portion and the portion of the rigid member causes the bridging portion to rotate relative to the remainder of the substrate.

34. The overpressure relief device according to claim 25, characterized in that, The substrate includes an electrically insulating film, and the trace is supported on the electrically insulating film.

35. The overpressure relief device according to claim 25, characterized in that, The rupture indicator also includes: One or more spacers, said one or more spacers being positioned on the base and adjacent to at least a portion of said rigid member; and A top cover that covers the one or more spacers.

36. The overpressure relief device according to claim 35, characterized in that, The outer flange section includes a rupture indicator retainer configured to cover the pressure relief member and includes a slot configured to receive the rupture indicator.

37. The overpressure relief device according to claim 36, characterized in that, The top cover includes an outer surface that is flush with the surface of the rupture indicator holder.

38. The overpressure relief device according to claim 25, characterized in that, The traces include silver.

39. The overpressure relief device according to claim 25, characterized in that, The substrate and the traces are capable of withstanding temperatures of at least 400°C.

40. The overpressure relief device according to claim 25, characterized in that, The substrate and the traces are capable of withstanding temperatures of at least 500°C.

41. The overpressure relief device according to claim 25, characterized in that, The overhanging end includes a lip that extends downward toward the top surface of the central fractured section.

42. The overpressure relief device according to claim 25, characterized in that, The central fractured section includes an opening line formed thereon, and the overhanging end includes a portion extending beyond the opening line.

43. The overpressure relief device according to claim 42, characterized in that, The opening line is formed on the outer edge of the central fractured section.

44. The overpressure relief device according to claim 25, characterized in that, The central section is convex and includes a pair of opposing surfaces, the pair of opposing surfaces including a convex surface facing the overhanging end and a concave surface opposite the convex surface.

45. A burst indicator for detecting a process condition associated with an overpressure relief device, the overpressure relief device having a central burstable section and an outer flange section surrounding the central section, the burst indicator comprising: A flexible substrate configured to be operatively associated with the outer flange segment and including an overhanging end configured to extend over and spaced apart from the surface of the central segment; A conductive trace located on the substrate and extending to at least a portion of the overhang, the trace defining a circuit capable of conducting electrical signals; as well as A rigid member operatively associated with the substrate and extending over at least a portion of the overhanging end to cover the trace, such that when the central segment breaks to form a flap, the flap contacts and deforms the overhanging end, causing the rigid member to contact the trace, thereby affecting the circuit.

46. ​​The rupture indicator according to claim 45, characterized in that, The substrate includes stainless steel.

47. The rupture indicator according to claim 46, characterized in that, The substrate includes a thin film made of an electrically insulating material disposed thereon, and the trace includes silver disposed on the electrically insulating material.

48. The rupture indicator according to claim 45, characterized in that, Also includes: One or more spacers, said one or more spacers being positioned on the base and adjacent to at least a portion of said rigid member; as well as A top cover that covers the one or more spacers.

49. The rupture indicator according to claim 45, Its characteristics are: The rigid member includes a main body portion positioned on the base and a tongue portion extending from the main body portion at an angle relative to the base, such that the tongue portion is positioned above and spaced apart from the trace line. The cantilever end includes: A first opening, the first opening being sized to accommodate the tongue and located on a first side of the trace; and A second opening, sized to accommodate the tongue and located on a second side of the trace opposite to the first side, defines a bridging portion positioned below the tongue and supporting the trace for a length of time.

50. The overpressure relief device according to claim 49, characterized in that, The bridging portion includes a laterally extending portion operable to contact the portion of the rigid member when the flap deforms the overhanging end, such that the contact between the laterally extending portion and the portion of the rigid member causes the bridging portion to rotate relative to the remainder of the substrate.

51. A method for detecting the opening of a pressure relief device, the method comprising: The pressure relief device is installed within a structure to be protected from overpressure conditions, and the pressure relief device includes: A pressure relief member, the pressure relief member comprising a central fracturing section and an outer flange section surrounding the central section; and A fracture indicator, the fracture indicator comprising: A flexible substrate, operatively associated with the outer flange segment and including an overhanging end that extends over and is spaced apart from the surface of the central segment; A conductive trace, the conductive trace being located on the substrate and extending to at least a portion of the overhang, the trace defining a circuit capable of conducting electrical signals; and A rigid member operatively associated with the base and extending over at least a portion of the overhanging end to cover the trace; When an overvoltage condition reaching a predetermined threshold causes the central section to rupture and form a flap, the circuit is detected to be cut off. The flap contacts and deforms the overhanging end, causing the rigid member to contact the trace, thereby cutting off the circuit. Issue an alarm.

52. The method according to claim 51, characterized in that, Detecting the interruption of the circuit includes detecting the electrical characteristics of the circuit.

53. The method according to claim 52, characterized in that, The electrical characteristics include at least one of resistance, capacitance, inductance, reflectivity, open circuit indication, or closed circuit indication.

54. An overpressure relief device, comprising: A pressure relief member, the pressure relief member comprising a central fracturing section and an outer flange section surrounding the central section; as well as A fracture indicator, the fracture indicator comprising: A flexible bottom cover, operably associated with the outer flange section and including an overhanging end that extends over and is spaced apart from the surface of the central section; A fragile, non-conductive substrate, the fragile, non-conductive substrate being positioned on the bottom cover; A conductive trace, situated on the non-conductive substrate and including a portion extending beyond at least a portion of the overhang, the trace defining a circuit capable of conducting electrical signals; and A rigid member operatively associated with the substrate and having a tip extending beyond the trace, such that when the central segment breaks to form a flap, the flap contacts and deforms the overhanging end, causing the tip to contact the trace, thereby affecting the circuit.

55. The overpressure relief device according to claim 54, characterized in that, The rigid member includes a main body portion positioned on the base and a tongue portion extending from the main body portion across the trace, such that the tongue portion maintains a spaced relationship with the trace.

56. The overpressure relief device according to claim 55, characterized in that, The tongue extends from the body portion at an angle relative to the trace and the base.

57. The overpressure relief device according to claim 54, characterized in that, The bottom cover includes a cover weakening region that is operable to accommodate at least a portion of the rigid member when the overhanging end deforms.

58. The overpressure relief device according to claim 57, characterized in that, The substrate includes one or more substrate weakening regions that are operable to help the rigid member influence the circuit.

59. The overpressure relief device according to claim 58, characterized in that, The cover weakening region includes an opening extending through the bottom cover, and the one or more base weakening regions include one or more openings extending through the base.

60. The overpressure relief device according to claim 58, characterized in that, The one or more substrate weakening regions include a first region located on a first side of the trace and a second region located on a second side of the trace opposite to the first side.

61. The overpressure relief device according to claim 54, characterized in that, The rupture indicator also includes: One or more spacers, said one or more spacers being positioned on the base and adjacent to at least a portion of said rigid member; and A top cover that covers the one or more spacers.

62. The overpressure relief device according to claim 61, characterized in that, The outer flange section includes a rupture indicator retainer configured to cover the pressure relief member and includes a slot configured to receive the rupture indicator.

63. The overpressure relief device according to claim 62, characterized in that, The top cover includes an outer surface that is flush with the surface of the rupture indicator holder.

64. The overpressure relief device according to claim 54, characterized in that, The traces include silver.

65. The overpressure relief device according to claim 54, characterized in that, The substrate and the traces are capable of withstanding temperatures of at least 400°C.

66. The overpressure relief device according to claim 54, characterized in that, The substrate and the traces are capable of withstanding temperatures of at least 500°C.

67. The overpressure relief device according to claim 54, characterized in that, The overhanging end includes a lip that extends downward toward the top surface of the central fractured section.

68. The overpressure relief device according to claim 54, characterized in that, The central fractured section includes an opening line formed thereon, and the overhanging end includes a portion extending beyond the opening line.

69. The overpressure relief device according to claim 68, characterized in that, The opening line is formed on the outer edge of the central fractured section.

70. The overpressure relief device according to claim 54, characterized in that, The central section is convex and includes a pair of opposing surfaces, the pair of opposing surfaces including a convex surface facing the overhanging end and a concave surface opposite the convex surface.

71. A burst indicator for detecting a process condition associated with an overpressure relief device, the overpressure relief device having a central burstable section and an outer flange section surrounding the central section, the burst indicator comprising: A flexible bottom cover, operably associated with the outer flange section and including an overhanging end operable to extend over and spaced apart from the surface of the central section; A fragile, non-conductive substrate, the fragile, non-conductive substrate being positioned on the bottom cover; A conductive trace, located on the non-conductive substrate and including a portion extending beyond at least a portion of the overhang, the trace defining a circuit capable of conducting electrical signals; as well as A rigid member operatively associated with the substrate and having a tip extending beyond the trace, such that when the central segment breaks to form a flap, the flap contacts and deforms the overhanging end, causing the tip to contact the trace, thereby affecting the circuit.

72. The rupture indicator according to claim 71, characterized in that, The rigid member includes a main body portion positioned on the base and a tongue portion extending from the main body portion across the trace, such that the tongue portion maintains a spaced relationship with the trace.

73. The rupture indicator according to claim 72, characterized in that, The tongue extends from the body portion at an angle relative to the base.

74. The rupture indicator according to claim 71, characterized in that, The bottom cover includes a cover weakening region that is operable to accommodate at least a portion of the rigid member when the overhanging end deforms.

75. The rupture indicator according to claim 74, characterized in that, The substrate includes one or more substrate weakening regions that are operable to help the rigid member influence the circuit.

76. The rupture indicator according to claim 75, characterized in that, The cover weakening region includes an opening extending through the bottom cover, and the one or more base weakening regions include one or more openings extending through the base.

77. The rupture indicator according to claim 75, characterized in that, The one or more substrate weakening regions include a first region located on a first side of the trace and a second region located on a second side of the trace opposite to the first side.

78. The rupture indicator according to claim 71, characterized in that, Also includes: One or more spacers, said one or more spacers being positioned on the base and adjacent to at least a portion of said rigid member; as well as A top cover that covers the one or more spacers.

79. The rupture indicator according to claim 78, characterized in that, The top cover includes an outer surface operable to be flush with the top surface of the flange section.

80. The rupture indicator according to claim 71, characterized in that, The traces include silver.

81. The rupture indicator according to claim 71, characterized in that, The substrate and the traces are capable of withstanding temperatures of at least 400°C.

82. The rupture indicator according to claim 71, characterized in that, The substrate and the traces are capable of withstanding temperatures of at least 500°C.

83. The rupture indicator according to claim 71, characterized in that, The overhanging end includes a lip that extends downward toward the top surface of the central fractured section.

84. The rupture indicator according to claim 71, characterized in that, The bottom cover is made of stainless steel.

85. A method for detecting the opening of a pressure relief device, the method comprising: The pressure relief device is installed within a structure to be protected from overpressure conditions, and the pressure relief device includes: A pressure relief member, the pressure relief member comprising a central fracturing section and an outer flange section surrounding the central section; and A fracture indicator, the fracture indicator comprising: A flexible bottom cover, operably associated with the outer flange section and including an overhanging end operable to extend over and spaced apart from the surface of the central section; A fragile, non-conductive substrate, the fragile, non-conductive substrate being positioned on the bottom cover; A conductive trace, situated on the non-conductive substrate and including a portion extending beyond at least a portion of the overhang, the trace defining a circuit capable of conducting electrical signals; and A rigid member operatively associated with the substrate and having a tip extending beyond the trace, such that when the central segment breaks to form a flap, the flap contacts and deforms the overhanging end, causing the rigid member to contact the trace, thereby affecting the circuit. When an overvoltage condition reaching a predetermined threshold causes the central section to rupture and form a flap, the circuit is detected to be cut off. The flap contacts and deforms the overhanging end, causing the rigid member to contact the trace, thereby cutting off the circuit. Issue an alarm.

86. The method according to claim 85, characterized in that, Detecting the interruption of the circuit includes detecting the electrical characteristics of the circuit.

87. The method according to claim 86, characterized in that, The electrical characteristics include at least one of resistance, capacitance, inductance, reflectivity, open circuit indication, or closed circuit indication.

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