Safety assembly for oil storage tank

Abstract

The present application relates to oil and gas storage and transportation technology field, it is a kind of oil storage tank safety assembly, including main valve body, flow guide, rain cap, fire barrier core, oil seal box and oil seal pipe.The present application is reasonable and compact in structure, when using, add the existing known liquid seal oil, such as aviation hydraulic oil, in oil seal box, the liquid level of liquid seal oil is above the lower end of oil seal pipe, then the lower end of main valve body is fixedly installed on oil storage tank.In the present application, the oil seal box is arranged inside the main valve body, which is beneficial to heat preservation and improves the anti-freezing and anti-spray performance of the oil seal box.The rain cap is beneficial to rain prevention and can prevent foreign matter from entering the fire barrier core to affect performance.The present application can realize the breathing function of safety valve, solve the liquid seal spatter of hydraulic safety valve and the freezing of fire barrier that cannot be checked, ensure the safe operation of storage tank, reduce oil and gas loss, reduce air pollution, reduce atmospheric corrosion of storage tank, and eliminate safety hazards.The present application has the characteristics of safety, labor saving, simplicity, high efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil and gas storage and transportation technology, and is a safety component for oil storage tanks. Background Technology

[0002] Hydraulic safety valves and flame arresters are crucial accessories in petroleum storage and transportation systems, protecting the safety of oil storage tanks. Belonging to the category of automatic valves, hydraulic safety valves and flame arresters work in conjunction with mechanical safety valves. Hydraulic safety valves can control higher pressure values ​​than mechanical safety valves. They are normally closed under external force. Installed at the top of the oil tank, the hydraulic safety valve acts as a substitute for the mechanical breather valve, regulating the pressure balance within the tank and providing overpressure protection. The mechanical breather valve, located at the top of the tank, automatically controls the opening and closing of the oil and gas passages, thus protecting the tank from overpressure and reducing oil evaporation losses. A flame arrester is safely installed below the hydraulic safety valve. In winter, condensation can cause the flame arrester to freeze and become clogged, making it impossible to inspect and potentially leading to equipment accidents.

[0003] The current installation of flame arresters below hydraulic safety valves is unscientific. In winter, it is impossible to check for freezing blockages in the flame arresters, which can easily cause equipment failure.

[0004] In actual production, when hydraulic safety valves are used on oil storage tanks instead of mechanical breather valves to allow the tanks to breathe, liquid sealing oil from the liquid seal cylinder is used. This oil is typically colorless transformer oil, kerosene, diesel oil, low-viscosity lubricating oil, ethylene glycol, etc. (liquids with high boiling points, low volatility, and low freezing points are used as liquid seals). The tank breathes by changing the liquid level difference in the liquid seal cylinder due to the interaction between the internal and external pressures. When the internal pressure of the tank increases sharply, it can cause the liquid seal oil to splash, contaminating the tank. The contaminated tank top is difficult to clean and can lead to environmental pollution accidents. Summary of the Invention

[0005] This invention provides a safety component for oil storage tanks that overcomes the shortcomings of the prior art and effectively solves the problems of liquid seal splashing and flame arrestor freezing that cannot be checked in existing hydraulic safety valves.

[0006] The technical solution of the present invention is achieved through the following measures: a safety component for an oil storage tank, comprising a main valve body, a guide fluid, a rain cap, a flame arrestor, an oil seal box, and an oil seal pipe. The main valve body has an oil storage tank that is vertically connected and wider at the top than at the bottom. A guide fluid is detachably and fixedly installed on the upper end of the main valve body. The guide fluid has a cylindrical structure with an open top and a closed bottom. Several interconnecting holes are evenly distributed around the circumference on the outer side of the upper end of the guide fluid. A rain cap is provided on the outer side of the upper end of the guide fluid. A flame arrestor is fixedly installed on the inner side of the upper part of the guide fluid corresponding to the position below the interconnecting holes. An oil seal box is fixedly installed on the inner side of the upper part of the oil storage tank. A vertically connected mounting hole is provided in the center of the lower end of the guide fluid. An oil seal pipe with its lower end located on the inner side of the lower part of the oil seal box is fixedly installed on the lower end of the guide fluid corresponding to the mounting hole.

[0007] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0008] After the upper end of the oil seal tube passes through the mounting hole, it can be located on the lower inner side of the guide fluid. A support cylinder is fixedly installed on the upper end of the oil seal tube. The upper end of the support cylinder is in contact with the lower end of the flame arrestor core. Several vent holes with internal and external communication are discretely distributed on the outer side of the support cylinder.

[0009] The upper outer side of the oil seal pipe corresponding to the inner side of the guide fluid position can be provided with several oil return holes that are connected internally and externally at intervals along the circumference.

[0010] The aforementioned flame arrestor core can be annular with a sealing ring installed between its lower end and the upper end of the support cylinder. The flame arrestor core is equipped with a fixing rod whose lower end is fixedly installed together with the upper end of the support cylinder. The upper center of the rain cap is provided with a through-hole fixing hole. A fixing screw with a cap nut screwed into it is fixedly installed at the upper end of the fixing rod after passing through the fixing hole.

[0011] The lower inner side of the main valve body has several support blocks evenly distributed around the circumference. Each support block has a fixing groove with the opening facing upward, and each fixing groove has a mounting plate fixed to the lower outer side of the oil seal box.

[0012] The lower end of the aforementioned fluid guide may be provided with a connecting screw hole, and an oil dipstick with its lower end located between the outer side of the oil seal tube and the inner side of the oil seal is screwed into the connecting screw hole. The lower end of the oil dipstick is located below the lower end of the oil seal tube.

[0013] A mounting flange can be fixedly installed on the lower outer side of the main valve body.

[0014] This invention features a reasonable and compact structure. In use, a known liquid sealing oil, such as aviation hydraulic oil, is added to the oil seal box, with the oil level above the lower end of the oil seal pipe. The lower end of the main valve body is then fixedly installed on the oil storage tank. The oil seal box is positioned inside the main valve body, which facilitates heat preservation and improves its antifreeze and anti-spray performance. The rain cap not only protects against rain but also prevents debris from entering the flame arrestor core and affecting its performance. This invention achieves the breathing function of the safety valve and solves the problems of liquid seal splashing in hydraulic safety valves and the inability to inspect frozen flame arrestors, ensuring safe operation of the storage tank, reducing oil and gas loss, reducing air pollution, reducing atmospheric corrosion of the storage tank, and eliminating safety hazards. It is characterized by safety, labor-saving, simplicity, and high efficiency. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the front sectional view of Embodiment 1.

[0016] Appendix Figure 2 This is a top sectional view of the structure of Example 1.

[0017] Appendix Figure 3 This is a three-dimensional structural diagram of Example 1.

[0018] The codes in the attached diagram are as follows: 1 is the main valve body, 2 is the fluid guide, 3 is the rain cap, 4 is the flame arrestor core, 5 is the oil seal box, 6 is the oil seal pipe, 7 is the oil storage tank, 8 is the connecting hole, 9 is the support cylinder, 10 is the vent hole, 11 is the oil return hole, 12 is the sealing ring, 13 is the fixing rod, 14 is the fixing screw, 15 is the cap nut, 16 is the support block, 17 is the mounting plate, 18 is the oil dipstick, and 19 is the mounting flange. Detailed Implementation

[0019] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0020] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0021] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0022] Example 1: As shown in the attached document Figure 1 , 2As shown in Figure 3, the safety components of the oil storage tank include a main valve body 1, a guide fluid 2, a rain cap 3, a flame arrestor core 4, an oil seal box 5, and an oil seal pipe 6. The main valve body 1 has an oil storage tank 7 that is vertically connected and wider at the top than at the bottom. The guide fluid 2 is detachably and fixedly installed on the upper end of the main valve body 1. The guide fluid 2 has a cylindrical structure with an open top and a closed bottom. Several connecting holes 8 are evenly distributed around the circumference of the upper outer side of the guide fluid 2. The upper outer side of the guide fluid 2 is covered with a rain cap 3. The flame arrestor core 4 is fixedly installed on the upper inner side of the guide fluid 2 corresponding to the position below the connecting holes 8. The oil seal box 5 is fixedly installed on the upper inner side of the oil storage tank 7. The lower center of the guide fluid 2 has a vertically connected mounting hole. The lower end of the guide fluid 2 with the lower end located on the lower inner side of the oil seal box 5 is fixedly installed at the position corresponding to the mounting hole.

[0023] According to requirements, the flame arrestor core 4 uses existing known technologies, such as metal mesh filter cores and corrugated filter cores. The rain cap 3 is umbrella-shaped, and the upper end of the connecting hole 8 can extend to the upper surface of the guide fluid 2. The lower end of the guide fluid 2 and the upper end of the main valve body 1 are detachably fixed together by flanges, bolts, and nuts. In use, existing known liquid sealing oil, such as aviation hydraulic oil, is added to the oil seal box 5. The liquid level of the liquid sealing oil is located above the lower end of the oil seal pipe 6. Then, the lower end of the main valve body 1 is fixedly installed on the oil storage tank. In this invention, the oil seal box 5 is set inside the main valve body 1, which is beneficial for heat preservation and improves the antifreeze and anti-spray performance of the oil seal box 5. The rain cap 3 is beneficial for rain protection and can also prevent debris from entering the flame arrestor core 4 and affecting its performance. This invention can realize the breathing function of the safety valve and solve the problems of liquid seal splashing of hydraulic safety valves and the inability to inspect the flame arrestor when frozen. It ensures the safe operation of the storage tank, reduces oil and gas loss, reduces air pollution, reduces atmospheric corrosion of the storage tank, and eliminates safety hazards. The present invention has a reasonable and compact structure and features safety, labor-saving, simplicity and high efficiency.

[0024] The above-mentioned safety components for oil storage tanks can be further optimized and / or improved according to actual needs:

[0025] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, the upper end of the oil seal pipe 6 passes through the mounting hole and is located on the lower inner side of the guide fluid 2. A support cylinder 9 is fixedly installed on the upper end of the oil seal pipe 6. The upper end of the support cylinder 9 is in contact with the lower end of the flame arrestor core 4. Several vent holes 10 with internal and external communication are discretely distributed on the outer side of the support cylinder 9. During use, the support cylinder 9 can reduce the external spraying of liquid seal oil when the pressure inside the storage tank changes, and prevent the liquid seal oil from splashing and affecting the flame arresting effect of the flame arrestor core 4.

[0026] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1As shown, several internally and externally connected oil return holes 11 are arranged circumferentially on the outer side of the upper end of the oil seal pipe 6 corresponding to the inner position of the guide fluid 2. Depending on the requirements, the oil return holes 11 are semi-circular. During use, when the pressure inside the storage tank fluctuates, the liquid sealing oil in the oil seal box 5 flows into the guide fluid 2 through the oil seal pipe 6 and the oil return holes 11. After the pressure inside the storage tank stabilizes, it can flow back into the oil seal box 5 through the oil return holes 11, preventing the liquid sealing oil in the oil seal box 5 from leaking out and losing its sealing effect. Simultaneously, when liquid sealing oil is added to the guide fluid 2, the liquid sealing oil can also flow into the oil seal box 5 through the oil return holes 11, making operation convenient.

[0027] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figure 3, the flame-arresting core 4 is annular, with a sealing ring 12 installed between its lower end and the upper end of the support cylinder 9. Inside the flame-arresting core 4, a fixing rod 13 is fixedly installed with its lower end to the upper end of the support cylinder 9. A through-hole is provided in the center of the upper end of the rain cap 3. A fixing screw 14, with its upper end passing through the fixing hole and screwed with a cap-shaped nut 15, is fixedly installed on the upper end of the fixing rod 13. Depending on the requirements, the sealing ring 12 is fitted onto the outside of the fixing rod 13. The outer diameter of the fixing screw 14 is smaller than the outer diameter of the fixing rod 13. The upper end of the fixing rod 13 provides support for the rain cap 3. The cap-shaped nut 15 and the fixing rod 13 fix the rain cap 3. Simultaneously, the cap-shaped nut 15 prevents rainwater or impurities from entering the flame-arresting core 4 and affecting its flame-arresting function.

[0028] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, several support blocks 16 are evenly distributed along the circumference of the lower inner side of the main valve body 1. Each support block 16 has a fixing groove with its opening facing upwards, and a mounting plate 17 fixed to the lower outer side of the oil seal box 5 is fixedly installed in each fixing groove. As required, each mounting plate 17 and the corresponding support block 16 are fixed together by connecting bolts. This arrangement can improve the stability of the oil seal box 5.

[0029] Example 6: As an optimization of the above examples, as shown in the appendix Figure 1 , 2 As shown, the lower end of the guide tube 2 is provided with a connecting screw hole, and an oil dipstick 18 is screwed into the connecting screw hole. The lower end of the dipstick 18 is located between the outer side of the oil seal tube 6 and the inner side of the oil seal. The lower end of the oil dipstick 18 is located below the lower end of the oil seal tube 6. During use, this setting allows for checking the oil level in the oil seal box 5, ensuring that the oil level in the oil seal box 5 is at the lower end of the oil seal tube 6. This prevents flames from entering the tank through the oil seal tube 6 and the oil seal box 5, thus avoiding accidents. It also facilitates inspection and maintenance during use.

[0030] Example 6: As an optimization of the above examples, as shown in the appendix Figure 1 , 3 As shown, a mounting flange 19 is fixedly installed on the outer side of the lower end of the main valve body 1. This design facilitates installation with the tank during use.

[0031] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A safety component for an oil storage tank, characterized in that... The system includes a main valve body, a guide tube, a rain cap, a flame arrestor, an oil seal box, and an oil seal pipe. The main valve body has an oil storage tank that runs vertically and is wider at the top than at the bottom. A guide tube is detachably and fixedly installed on the upper end of the main valve body. The guide tube has a cylindrical structure that is open at the top and closed at the bottom. Several connecting holes that connect the inside and outside are evenly distributed along the circumference on the outer side of the upper end of the guide tube. A rain cap is installed on the outer side of the upper end of the guide tube. A flame arrestor is fixedly installed on the inner side of the upper part of the guide tube below the connecting holes. An oil seal box is fixedly installed on the inner side of the upper part of the oil storage tank. A vertically and horizontally through mounting hole is provided in the center of the lower end of the guide tube. An oil seal pipe with its lower end located on the inner side of the lower part of the oil seal box is fixedly installed on the lower end of the guide tube corresponding to the mounting hole. After the upper end of the oil seal tube passes through the mounting hole, it is located on the lower inner side of the guide fluid. A support cylinder is fixedly installed on the upper end of the oil seal tube. The upper end of the support cylinder is in contact with the lower end of the flame arrestor core. Several vent holes with internal and external communication are discretely distributed on the outer side of the support cylinder. Several oil return holes with internal and external connections are arranged at intervals along the circumference on the outer side of the upper end of the oil seal pipe corresponding to the inner side of the guide fluid. The flame arrestor core is circular and a sealing ring is installed between the lower end and the upper end of the support cylinder. The flame arrestor core is equipped with a fixing rod whose lower end is fixedly installed together with the upper end of the support cylinder. The upper center of the rain cap is equipped with a through fixing hole. The upper end of the fixing rod is fixedly installed with a fixing screw rod whose upper end passes through the fixing hole and is screwed with a cap nut. A mounting flange is fixedly installed on the outer side of the lower end of the main valve body.

2. The oil storage tank safety component according to claim 1, characterized in that... Several support blocks are evenly distributed along the circumference on the lower inner side of the main valve body. Each support block has a fixing groove with the opening facing upward. Each fixing groove has a mounting plate fixed to the lower outer side of the oil seal box.

3. The oil storage tank safety component according to claim 1 or 2, characterized in that... The lower end of the guide tube is provided with a connecting screw hole, and an oil dipstick is screwed into the connecting screw hole. The lower end of the oil dipstick is located between the outer side of the oil seal tube and the inner side of the oil seal. The lower end of the oil dipstick is located below the lower end of the oil seal tube.

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