Hydrostatic test of casing pipe:
①. Use high-pressure water gun to clean the inside of the tube;
②. The surface of the thread must be coated with lubricant to minimize damage during the hydrostatic test (plugging and unloading);
③. Correctly clamp the workpiece, check whether the various parts of the equipment are running normally;
④. Check whether the protective device is safe and reliable;
⑤. Water injection and suppression, the suppression time is 7 seconds;
⑥. Fill in "Hydrostatic Test Report of Threaded Sleeve" carefully according to the workpiece number.
2020年1月14日星期二
2020年1月13日星期一
Inspection method of galvanized pipe
1 surface inspection
The inner and outer surfaces of galvanized steel pipes shall be inspected with the naked eye, one by one.
2 size check
The galvanized steel pipe should be tested on a black tube before galvanizing with a child equipment with sufficient accuracy.
3 thread inspection
Threaded galvanized steel pipe, according to YB 822 regulations, use a ring gauge to check the thread one by one.
4 Other inspections
(1) Galvanization guide uniformity test; test method: "copper sulfate impregnation method for homogeneity test of galvanized layer";
Sampling location and miles: Take 2 steel pipes for each batch, and take 1 longitudinal sample.
Cold bending test; Test method: GB244; Sampling location and several miles: Take 1 steel pipe for each batch, and take 1 longitudinal sample for each.
(3) Determination of weight of galvanized layer; Test method: "Measurement of weight of galvanized layer by antimony chloride method";
Sampling location and miles: Take 2 steel pipes for each batch, and take 1 longitudinal sample.
The inner and outer surfaces of galvanized steel pipes shall be inspected with the naked eye, one by one.
2 size check
The galvanized steel pipe should be tested on a black tube before galvanizing with a child equipment with sufficient accuracy.
3 thread inspection
Threaded galvanized steel pipe, according to YB 822 regulations, use a ring gauge to check the thread one by one.
4 Other inspections
(1) Galvanization guide uniformity test; test method: "copper sulfate impregnation method for homogeneity test of galvanized layer";
Sampling location and miles: Take 2 steel pipes for each batch, and take 1 longitudinal sample.
Cold bending test; Test method: GB244; Sampling location and several miles: Take 1 steel pipe for each batch, and take 1 longitudinal sample for each.
(3) Determination of weight of galvanized layer; Test method: "Measurement of weight of galvanized layer by antimony chloride method";
Sampling location and miles: Take 2 steel pipes for each batch, and take 1 longitudinal sample.
Knowledge of precision steel tubes
As a metal pipe with excellent properties, the use of steel pipes in the pipeline industry is very wide. In order to meet the requirements of different industries, the types of steel pipes are also constantly being enriched.
The quality of precision steel pipes is more critical because precision steel pipes are mainly used for the transportation of oil and natural gas. If these gases leak, the consequences are unthinkable, so the quality of steel pipes must be good.
In order to extend the life of the steel pipe, we need to add some alloy elements in it, so that we are struggling to increase its strength. In order to better meet the needs of the market, we can design the size and precision steel pipe according to customer requirements The accuracy requirements are also very high.
At present, one of the most widely used pipes in the pipeline industry is welded steel pipes.As the name implies, this type of steel pipe is a pipe made by welding.
With the continuous development and progress of modern manufacturing industry, the performance of this type of welded steel pipe is also constantly improving, so the popularity of this type of pipeline is also increasing.
The quality of precision steel pipes is more critical because precision steel pipes are mainly used for the transportation of oil and natural gas. If these gases leak, the consequences are unthinkable, so the quality of steel pipes must be good.
In order to extend the life of the steel pipe, we need to add some alloy elements in it, so that we are struggling to increase its strength. In order to better meet the needs of the market, we can design the size and precision steel pipe according to customer requirements The accuracy requirements are also very high.
At present, one of the most widely used pipes in the pipeline industry is welded steel pipes.As the name implies, this type of steel pipe is a pipe made by welding.
With the continuous development and progress of modern manufacturing industry, the performance of this type of welded steel pipe is also constantly improving, so the popularity of this type of pipeline is also increasing.
Production steps of spiral steel pipe
Last time we introduced the first 7 steps of the production of spiral steel pipes, this time we introduce the next 7 steps:
(8) The welded seams are inspected by an online continuous ultrasonic automatic flaw detector to ensure 100% non-destructive testing coverage of spiral steel pipes. If there is a defect, it will automatically alarm and spray the mark, and the production workers will adjust the process parameters at any time to eliminate the defect in time.
(9) The steel pipe is cut into individual pieces by an air plasma cutting machine.
(10) After cutting into a single steel pipe, the first three pipes of each batch of steel pipe must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion status, surface quality of the steel pipe and non-destructive inspection to ensure the pipe manufacturing process. After passing the qualification, it can be officially put into production.
(11) The parts with continuous sonic flaw detection marks on the welds are reviewed by manual ultrasound and x-rays. If there are any defects,
After repair, non-destructive inspection is performed again until it is confirmed that the defect has been eliminated.
(12) All pipes where steel butt welds and T-shaped joints intersect with spiral welds are inspected by x-ray television or film.
(13) Each steel pipe is subjected to a hydrostatic test, and the pressure is radial sealed. The test pressure and time are strictly controlled by the steel tube hydraulic pressure testing device. The test parameters are printed automatically.
(14) The pipe end is machined so that the end face verticality, bevel angle and blunt side are accurately controlled.
Generally, after these 14 steps, a spiral steel pipe has been formed, but such spiral steel pipes cannot be directly sent to the market, and the quality inspection of the spiral steel pipes and other aspects need to be performed.
(8) The welded seams are inspected by an online continuous ultrasonic automatic flaw detector to ensure 100% non-destructive testing coverage of spiral steel pipes. If there is a defect, it will automatically alarm and spray the mark, and the production workers will adjust the process parameters at any time to eliminate the defect in time.
(9) The steel pipe is cut into individual pieces by an air plasma cutting machine.
(10) After cutting into a single steel pipe, the first three pipes of each batch of steel pipe must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion status, surface quality of the steel pipe and non-destructive inspection to ensure the pipe manufacturing process. After passing the qualification, it can be officially put into production.
(11) The parts with continuous sonic flaw detection marks on the welds are reviewed by manual ultrasound and x-rays. If there are any defects,
After repair, non-destructive inspection is performed again until it is confirmed that the defect has been eliminated.
(12) All pipes where steel butt welds and T-shaped joints intersect with spiral welds are inspected by x-ray television or film.
(13) Each steel pipe is subjected to a hydrostatic test, and the pressure is radial sealed. The test pressure and time are strictly controlled by the steel tube hydraulic pressure testing device. The test parameters are printed automatically.
(14) The pipe end is machined so that the end face verticality, bevel angle and blunt side are accurately controlled.
Generally, after these 14 steps, a spiral steel pipe has been formed, but such spiral steel pipes cannot be directly sent to the market, and the quality inspection of the spiral steel pipes and other aspects need to be performed.
Comparison of ERW and LSAW Steel Pipes
"ERW steel pipe" is a high-frequency straight seam resistance welded pipe. It is used to transport vapor and liquid objects such as oil and natural gas, and can meet various requirements of high and low pressure. At present, it plays a pivotal role in the field of transportation pipes in the world.
1. Welded pipe refers to the ordinary "submerged arc welded steel pipe", which is represented by "SC" in electrical engineering. It can be used as water gas pipe or threaded pipe, which is relatively thick.
2. The line pipe is also a wire tube, which is relatively thin. It is indicated by "T" and can only be used as a pipe.
3. The ERW pipe is a "high-frequency resistance welded steel pipe", which is different from the ordinary welding pipe welding process. The welding seam is made by melting the base metal of the steel strip body, and the mechanical strength is better than that of the ordinary welded pipe.
"LSAW steel pipe"is a straight seam submerged arc welded steel pipe. Its main technical characteristics are as follows:
1. During the steel tube forming process, the steel plate is uniformly deformed, the residual stress is small, and the surface is not scratched. The processed steel pipe has greater flexibility in the diameter and wall thickness steel pipe size specifications, especially in the production of high-steel-grade thick-walled steel pipes, especially large-caliber thick-walled pipes, which have unmatched advantages in other processes, which can meet Users have more requirements in terms of steel pipe specifications;
2. Adopting the pre-weld and then internal-outer welding (fine welding) process, welding can be achieved at the optimal position, which is not prone to defects such as misalignment, welding deviation and under-penetration, and it is easy to control the welding quality;
3. The overall mechanical diameter expansion can effectively improve the dimensional accuracy of the steel pipe and improve the distribution of stress in the steel pipe, thereby avoiding damage due to stress corrosion, and at the same time, it is beneficial to the welding construction on site;
4. Carry out 9 100% quality inspections on steel pipes, so that the entire process of steel pipe production is under effective detection and monitoring, effectively ensuring product quality;
5. All the equipment of the whole production line has the function of networking with computer data acquisition system, realizing the real-time transmission of data, and the central control room controls the production.
http://www.xysteelpipe.com/info/Comparison-of-ERW-and-LSAW-Steel-Pipes-1594-1.htm
1. Welded pipe refers to the ordinary "submerged arc welded steel pipe", which is represented by "SC" in electrical engineering. It can be used as water gas pipe or threaded pipe, which is relatively thick.
2. The line pipe is also a wire tube, which is relatively thin. It is indicated by "T" and can only be used as a pipe.
3. The ERW pipe is a "high-frequency resistance welded steel pipe", which is different from the ordinary welding pipe welding process. The welding seam is made by melting the base metal of the steel strip body, and the mechanical strength is better than that of the ordinary welded pipe.
"LSAW steel pipe"is a straight seam submerged arc welded steel pipe. Its main technical characteristics are as follows:
1. During the steel tube forming process, the steel plate is uniformly deformed, the residual stress is small, and the surface is not scratched. The processed steel pipe has greater flexibility in the diameter and wall thickness steel pipe size specifications, especially in the production of high-steel-grade thick-walled steel pipes, especially large-caliber thick-walled pipes, which have unmatched advantages in other processes, which can meet Users have more requirements in terms of steel pipe specifications;
2. Adopting the pre-weld and then internal-outer welding (fine welding) process, welding can be achieved at the optimal position, which is not prone to defects such as misalignment, welding deviation and under-penetration, and it is easy to control the welding quality;
3. The overall mechanical diameter expansion can effectively improve the dimensional accuracy of the steel pipe and improve the distribution of stress in the steel pipe, thereby avoiding damage due to stress corrosion, and at the same time, it is beneficial to the welding construction on site;
4. Carry out 9 100% quality inspections on steel pipes, so that the entire process of steel pipe production is under effective detection and monitoring, effectively ensuring product quality;
5. All the equipment of the whole production line has the function of networking with computer data acquisition system, realizing the real-time transmission of data, and the central control room controls the production.
http://www.xysteelpipe.com/info/Comparison-of-ERW-and-LSAW-Steel-Pipes-1594-1.htm
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