Method for measuring wall thickness of sulfuric acid storage tank in alpine region
By setting measurement points and holes on the outer insulation layer of sulfuric acid storage tanks in high-altitude areas, combined with the use of insulation plugs, the problem of difficult to measure the wall thickness of sulfuric acid storage tanks under the insulation layer is solved, and accurate and convenient wall thickness monitoring and corrosion evaluation are achieved.
Patent Information
- Application Number
- CN202510641952.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-19
- Publication Date
- 2025-08-05
AI Technical Summary
In high-altitude areas, after the insulation layer is installed on the outer wall of the sulfuric acid storage tank, it is difficult to accurately measure the wall thickness, and the removal of the insulation layer may lead to the solidification of sulfuric acid. The prior art has problems such as large measurement errors and complex operation.
Set up a measurement point group on the external insulation layer of the sulfuric acid storage tank, and set up a measurement hole at each point. Use an ultrasonic thickness gauge to measure the wall thickness, install an insulation plug to maintain the insulation effect, and repeat the measurement periodically and record the data.
When the insulation effect is not affected, accurately monitor the wall thickness changes of sulfuric acid storage tanks, timely understand the corrosion conditions, simple operation and accurate measurement.
Smart Images
Figure CN120426918A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of sulfuric acid storage tank monitoring, and more particularly to a method for measuring the wall thickness of sulfuric acid storage tanks in high-altitude cold areas. Background Art
[0002] Industrial sulfuric acid production typically produces large quantities of concentrated sulfuric acid. This concentrated sulfuric acid is typically stored in a tank farm, consisting of several identical tanks. Due to the varying production scales of various plants, the volume of these tanks ranges from several hundred to several thousand cubic meters. Because concentrated sulfuric acid has a passivating effect on carbon steel, carbon steel is typically used for storage tanks. While this passivating effect can occur, it can still corrode the steel to some extent. Therefore, regular wall thickness measurements of sulfuric acid storage tanks are crucial to understanding corrosion and preventing damage and sulfuric acid leakage.
[0003] When storing concentrated sulfuric acid in high-altitude cold regions, industrial sulfuric acid has two concentrations, 98% and 92.5%, and the freezing points of these two concentrations are around 0.1°C and -34°C respectively. In high-altitude cold regions, the outdoor temperature can reach as low as 40°C or above. The industrial sulfuric acid stored in the tank is likely to solidify. In order to prevent the solidification of industrial sulfuric acid, it is necessary to install thermal insulation cotton on the tank. After the outer wall of the tank is insulated as a whole, it increases the difficulty of measuring the thickness of the tank wall. If the insulation cotton is removed before measurement, the workload is large and the concentrated sulfuric acid may solidify. If the insulation cotton is not removed, the total thickness of the insulation cotton and the tank side wall is directly measured and then the thickness of the insulation cotton is subtracted. Since the insulation cotton is relatively soft and the thickness of the insulation cotton cannot be guaranteed to be consistent in all places during installation and use, it is easy to cause large measurement errors.
[0004] Therefore, how to provide a method for measuring sulfuric acid storage tanks in high-altitude and cold regions that is simple to operate and highly accurate is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention
[0005] In view of this, the present invention aims to provide a method for measuring the wall thickness of a sulfuric acid storage tank in a high-altitude cold region to at least to some extent solve the problem that it is difficult to accurately measure the wall thickness of the sulfuric acid storage tank after an insulation layer is provided on the outer wall of the sulfuric acid storage tank.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions:
[0007] A method for measuring the wall thickness of a sulfuric acid storage tank in a high-altitude cold region comprises the following steps:
[0008] Step 1: Determine the measurement points. Before or during the initial use of the sulfuric acid storage tank, at least one group of measurement points is set and marked along the circumference of the external insulation layer of the sulfuric acid storage tank according to the size of the sulfuric acid storage tank. Each group of measurement points includes a plurality of measurement points spaced apart along the height direction of the sulfuric acid storage tank, and adjacent measurement points are staggered.
[0009] Step 2: Open measuring holes: Set measuring holes at all measuring points on the insulation layer, and use an ultrasonic thickness gauge to measure and record the wall thickness of the sulfuric acid storage tank corresponding to each measuring hole to obtain the initial wall thickness of each measuring point of the sulfuric acid storage tank;
[0010] Step 3: Install the insulation plug: Fill the insulation plug into the measuring hole and ensure that the insulation plug fits tightly against the inner wall of the measuring hole;
[0011] Step 4. Regular measurement: After a certain period of use, remove the insulation plug and use the thickness gauge to measure the wall thickness of each measuring hole in the sulfuric acid storage tank and record it. After the measurement is completed, compare it with the initial wall thickness.
[0012] The beneficial effects that can be achieved by the present invention are as follows: by opening measuring holes and arranging insulation plugs, the wall thickness of the sulfuric acid storage tank can be accurately monitored while ensuring the insulation effect, and the corrosion degree of the sulfuric acid storage tank can be timely monitored. A plurality of measuring holes are arranged along the height direction of the storage tank and adjacent measuring holes are staggered, so that the corrosion degree of different parts of the storage tank can be comprehensively and more accurately monitored.
[0013] Preferably, in step 1, the vertical distance between two adjacent measuring points is 1 m, and the horizontal distance is 3 m.
[0014] Preferably, in step 2, the inner diameter of the measuring hole does not exceed 200 mm.
[0015] Preferably, in step 2 and step 4, before measuring with a thickness gauge, the outer wall surface of the storage tank at the measuring point needs to be cleaned first.
[0016] Preferably, in step 2 and step 4, during measurement, each measurement point is measured at least three times to obtain an average value.
[0017] Preferably, in step three, the thermal insulation plug includes an outer shell and thermal insulation cotton filled in the outer shell, and the outer shell is slidably installed in the measuring hole along the axial direction of the measuring hole.
[0018] Preferably, the shell has a conical structure, and its diameter gradually decreases towards the side wall of the storage tank.
[0019] Preferably, the shell is made of metal.
[0020] Preferably, a handle is installed on a side of the shell away from the side wall of the storage tank.
[0021] Preferably, the outer side wall of the storage tank is further provided with a detection ladder, and the detection ladder is arranged corresponding to the measurement point.
[0022] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a method for measuring the wall thickness of sulfuric acid storage tanks in alpine areas, which has the following beneficial effects:
[0023] 1. Through the cooperation of the measuring hole and the insulation plug, the wall thickness measurement operation is simple and convenient on the basis of ensuring the insulation effect of the sulfuric acid storage tank.
[0024] 2. The position of the measuring point is relatively fixed and is compared with the initial data. The operation steps are simple, practical and accurate.
[0025] 3. Setting multiple measuring points and staggering adjacent measuring points can more accurately and comprehensively obtain the wall thickness data of different parts of the sulfuric acid storage tank and accurately understand the degree of corrosion inside the sulfuric acid storage tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0027] Figure 1 This is a schematic diagram of the measurement point distribution structure of the sulfuric acid storage tank provided by the present invention.
[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of the thermal insulation plug provided by the present invention.
[0029] Figure 3 This is a schematic diagram of the main structure of the thermal insulation plug provided by the present invention.
[0030] In the figure: 1. Sulfuric acid storage tank, 2. Insulation layer, 3. Measuring hole, 4. Insulation plug, 41. Shell, 42. Insulation cotton, 43. Handle, 5. Inspection ladder. DETAILED DESCRIPTION
[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0032] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.
[0033] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.
[0034] See also Figure 1-Figure 3 The embodiment of the present invention discloses a method for measuring the wall thickness of a sulfuric acid storage tank in a high-altitude cold region. Taking a sulfuric acid storage tank 1 with a diameter of 3m and a height of 12m and an insulation layer 2 with a thickness of about 200mm as an example, the method includes the following steps:
[0035] Step 1: Determine the measuring points. Before or during the initial use of the sulfuric acid storage tank 1, a group of measuring points is set and marked outside the insulation layer 2 according to the size of the sulfuric acid storage tank 1. The group of measuring points includes 11 measuring points spaced apart along the height direction of the sulfuric acid storage tank 1, and adjacent measuring points are staggered to form a zigzag structure.
[0036] The vertical height between two adjacent measuring points is 1m and the horizontal distance is 3m.
[0037] Step 2: Open a measuring hole 3 and measure the initial wall thickness: Open a measuring hole 3 at all measuring points on the insulation layer 2. The measuring hole 3 is a circular hole with an inner diameter of 150 mm or a square hole with a diameter of 150 mm. Use the thickness gauge again to measure the wall thickness of the sulfuric acid storage tank 1 corresponding to each measuring hole and record it. After the measurement is completed, compare the data with the initial wall thickness.
[0038] Before using the thickness gauge for measurement, the outer wall surface of the sulfuric acid storage tank 1 at the measuring point must be cleaned first; when measuring, each measuring point should be measured at least three times, and the average value is taken as the initial wall thickness of the measuring point.
[0039] Step 3: Install the insulation plug 4: Fill the insulation plug 4 into the measuring hole 3, ensuring that the insulation plug 4 fits tightly against the inner wall of the measuring hole 3;
[0040] Among them, the insulation plug 4 includes an outer shell 41 and insulation cotton 42 filled in the outer shell 41, which is durable and not easy to damage. The outer shell 41 is slidably installed in the measuring hole 3 along the axial direction of the measuring hole 3. The outer shell 41 is made of corrosion-resistant metal material and is a hollow rectangular body with a length of 150mm* a width of 150mm* a height of 195mm or a hollow cylinder with a diameter of 150mm* a height of 195mm. In order to enable the insulation plug 4 to be smoothly inserted into the measuring hole 3 without damaging the outer insulation layer 2, the outer shell 41 has a conical structure, and its outer diameter gradually decreases in the direction close to the side wall of the sulfuric acid storage tank 1, and the cone angle is about 2°. A handle 43 is installed on the side of the outer shell 41 away from the side wall of the sulfuric acid storage tank 1 to facilitate the removal and placement of the insulation plug 4.
[0041] Step 4: Regular measurement: After a certain period of use, remove the insulation plug 4 and use the ultrasonic thickness gauge to measure and record each measuring point again. After the measurement is completed, compare it with the initial wall thickness.
[0042] In actual measurements, the greater the number of measurement point groups, the more accurate the measurement, making it easier to accurately determine changes in the tank's wall thickness and avoid tank damage and sulfuric acid leakage. However, due to the gap between the measurement hole 3 and the insulation plug 4, heat loss can occur, affecting the insulation effect. Therefore, the greater the number of measurement points, the worse the insulation effect may be. Therefore, the number of measurement point groups can be set as high as necessary based on the tank size while ensuring good insulation.
[0043] The outer wall of the sulfuric acid storage tank 1 is also provided with a detection ladder 5, which is arranged corresponding to the measurement points. The measurement points are arranged in a zigzag shape, and the detection ladder is also in a zigzag structure, corresponding to the measurement points, for easy detection.
[0044] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the descriptions of the methods disclosed in the embodiments for similar or identical parts. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, comparison is simplified. For relevant parts, refer to the description of the methods.
[0045] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for measuring the wall thickness of sulfuric acid storage tanks in cold and high altitude areas, characterized in that: The following steps are involved: Step 1, determining the measurement points; before the sulfuric acid storage tank (1) is used or in the initial stage of use, at least one group of measurement points is set and marked on the external insulation layer (2) of the sulfuric acid storage tank (1) along the circumferential direction thereof according to the size of the sulfuric acid storage tank (1), each group of measurement points includes a plurality of measurement points spaced apart along the height direction of the sulfuric acid storage tank (1), and two adjacent measurement points are staggered; Step 2: Opening a measuring hole (3) and measuring the initial wall thickness: Measuring holes (3) are set at all measuring points on the insulation layer (2), and the wall thickness of the sulfuric acid storage tank (1) corresponding to each measuring hole (3) is measured and recorded using an ultrasonic thickness gauge to obtain the initial wall thickness of each measuring point of the sulfuric acid storage tank (1); Step 3: Install the insulation plug (4): Fill the insulation plug (4) into the measuring hole (3), ensuring that the insulation plug (4) fits tightly against the inner wall of the measuring hole (3); Step 4: Regular measurement: After a certain period of use, remove the insulation plug (4), and use the thickness gauge to measure the wall thickness of the sulfuric acid storage tank (1) corresponding to each measuring hole and record it. After the measurement is completed, compare it with the initial wall thickness.
2. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold and high altitude area according to claim 1, characterized in that: In step 1, the vertical distance between two adjacent measuring points is 1 m, and the horizontal distance is 3 m.
3. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold and high altitude area according to claim 1, characterized in that: In step 2, the inner diameter of the measuring hole (3) does not exceed 200 mm.
4. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold and high altitude area according to claim 1, characterized in that: In steps 2 and 4, before measuring with an ultrasonic thickness gauge, the outer wall of the tank at the measuring point must be cleaned.
5. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold and high altitude area according to claim 1, characterized in that: In steps 2 and 4, each measurement point should be measured at least three times to obtain the average value.
6. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold region according to claim 1, characterized in that: In step three, the insulation plug (4) includes an outer shell (41) and insulation cotton (42) filled in the outer shell (41), and the outer shell (41) is slidably installed in the measuring hole (3) along the axial direction of the measuring hole (3).
7. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold region according to claim 6, characterized in that: The outer shell (41) has a conical structure, and its outer diameter gradually decreases toward the side wall of the sulfuric acid storage tank (1).
8. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold and high altitude area according to claim 6, characterized in that: The housing (41) is made of metal.
9. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold region according to claim 6, characterized in that: A handle (43) is installed on the side of the housing (41) away from the side wall of the sulfuric acid storage tank (1).
10. The method for measuring the wall thickness of a sulfuric acid storage tank in a cold region according to claim 1, characterized in that: The outer side wall of the sulfuric acid storage tank (1) is further provided with a detection ladder (5), and the detection ladder (5) is arranged corresponding to the measurement point.