Corrosion Coupon EMT Customized Adjustable

Description

1. Name: Corrosion Coupon EMT Customized Adjustable access fittings

Coupon Holder Assemblies provide a retractable means of coupon monitoring in processes at pressures up to 1500 PSI/10.3 MPa and temperatures up to 500º F/260º C. Available lengths of 18, 24, 30, and 36 inches.

2. Material: Material – 316 SS

3. Feature: Pressure Rating – 1500 PSI (10.3 MPa)

Mounting – 1″ Full Port Valve Minimum

Temperature Rating – +500º F/+260º C

High-Temperature Option Available (1000º F)

4. Advantage: Provides a retractable means of coupon monitoring in processes.

5. Specification

6. Usage: EMT Corrosion Coupons are used to monitor the corrosion rates of the sample (coupon) in the pipe or container, and remove the belt pressure.

7. Minimum Order Quantity(MOQ):1 Piece/Piece.

8. Payment term: T/T or L/C at sight.

In a word, if you want to know more about Corrosion Coupon, please contact our professionals to answer them for you.

In recent years, the demand for oil and gas energy has been increasing. The number of onshore oil and gas exploits continues to decrease. Therefore, the exploitation of offshore oil and gas resources is increasing. Although offshore oil and gas can be transported to onshore oil depots through various channels. But in these channels. Pipeline transportation is still a way with the lowest cost and the least external interference. Because the marine environment is more complex. Therefore, submarine pipelines will inevitably have a large number of defects. This threatens the safety of the pipeline. Compared with onshore pipelines, it is relatively difficult to detect submarine pipelines. Therefore, it can only guarantee pipeline safety by strengthening protection. So we need corrosion coupon to detect corrosion

1. Features of submarine pipeline

1.1 High construction investment

Submarine pipelines are different from onshore oil and gas pipelines. Because in the process of building submarine oil and gas pipelines, a large number of ships need to work together. For example, pipe trench excavation requires trenching boats. Pipeline transportation requires a material supply ship. Pipe laying requires a pipe laying vessel. In addition, during the whole operation process. It requires the participation of auxiliary vessels. The cooperative operation of many vessels requires adequate financial support.

1.2 Strict construction quality requirements

The environment of a submarine pipeline is complex and special. This is to increase the construction difficulty. Once a dangerous accident occurs in the pipeline, the manufacturer needs to invest relatively more in maintenance. Therefore, in the pipeline construction stage, the quality requirements for pipeline design and construction are relatively high.

1.3 The environment is changeable

As we all know, the marine environment is volatile and unpredictable. And the changes are more dramatic. (such as typhoons, waves, etc.). Therefore, during the construction of submarine pipelines, the marine environment should be tested at any time. This is so that in case of a dangerous accident. People can take necessary remedial measures in time.

1.4 Complex Construction

Although most of the submarine pipeline construction work is carried out in the ocean. However, a small part of the work needs the cooperation of the onshore project team. Such as pipeline development, ship construction and maintenance, food and water supply, etc. At the same time, the direction and location of the construction ships also need the cooperation of the land base. Therefore, the whole construction process of submarine pipeline construction becomes more complex.

2. Analysis of causes of submarine pipeline corrosion

Corrosion is the main factor causing submarine pipeline failure. It is also the key to threatening the safety of the submarine pipelines.
After the exploitation of onshore oil and gas resources. It generally requires deep processing before long-distance transmission. However, the area of offshore platforms is relatively small. Therefore, after the exploitation of submarine oil and gas resources, they can only be simply treated and then transported. This makes oil and gas resources contain a lot of acidic components and bacteria. There are generally two types of acidic components. They are H2S and CO2 respectively.
The presence of H2S will cause comprehensive corrosion and stress corrosion cracking on the internal surface of submarine pipelines. The possibility of local corrosion is relatively small. Of course, the specific corrosion is mainly related to H2S concentration and pipe materials. The existence of CO2 will mainly cause local corrosion of submarine pipelines. Bacteria exist in oil and gas resources. This will increase the corrosion rate of the inner surface of the pipe.

3. Protection and repair measures for submarine pipeline

3.1 Internal anti-corrosion measures

There are mainly two types of internal anti-corrosion measures for submarine pipelines. One is to add a corrosion inhibitor into the pipeline. The other is to apply internal coating technology to the inner wall of the pipeline. Although the addition of a corrosion inhibitor can effectively prevent the corrosion of pipeline’s inner wall. At present, most submarine pipelines use this method to prevent corrosion on the inner wall. However, the proportion of corrosion inhibitor shall be reasonably designed according to the actual transmission medium. In terms of internal coating technology, there are many mature technologies at present. For example, epoxy powder internal coating technology, liquid epoxy coating internal coating technology, etc. Although the principles of various internal coating technologies are different. But in the end, they can effectively reduce the corrosion rate of the inner wall of the pipeline. So we need corrosion coupon to detect corrosion

3.2 Measures to improve project quality

(1) Adhere to periodic inspection

After the submarine pipeline has been running for a long time. The welding position and anti-corrosion coating of the pipeline will inevitably be damaged. At the same time, the fixed equipment of the pipeline will also change to a certain extent. Therefore, it is necessary to conduct periodic inspections on welded junctions, anti-corrosion coating and fixed equipment. We find problems in these parts or equipment in time. Then certain measures can be taken to solve the problem.

(2) Improve the tensile strength of pipe materials

Natural disasters have caused great damage to the pipeline It will deform the pipe. When the actual tensile stress of the pipe is greater than the theoretical tensile strength. It will damage the pipeline. Therefore, improving the tensile strength of pipeline materials is an effective measure to prevent pipeline damage caused by natural and geological disasters. However, the tensile strength of submarine pipeline shall be improved.  Therefore, this measure is generally not adopted.

(3) Take hazard prevention measures

There are no good solutions to prevent natural and geological disasters. Therefore, we can only strengthen the real-time monitoring of the marine environment. According to the changes of marine environment, the manufacturer shall make emergency plans for pipeline damage at any time. The economic losses and environmental pollution caused by pipeline damage shall be minimized.

4. Repair technology

4.1 Pipe deformation

Generally, pipeline deformation will not cause leakage. However, it will seriously reduce the service life of submarine pipelines. When the deformation of the submarine pipeline is relatively large. Then the pigging operations cannot be carried out. Therefore, when the pipe is deformed, it is necessary to repair it. Before pipe repair. Workers need to conduct a detailed investigation on the deformation position and amount of the pipeline. When the deformation of the pipe is relatively small. Workers can take pipe correction measures. Correct its deformation. When the deformation of the pipe is relatively large, the deformed pipe section shall be replaced in time.

4.2 Pipe perforation

The perforation of submarine pipelines is generally caused by corrosion. The pipe perforation will not cause large deformation of the pipe. But this may have an impact on the environment. For the perforation problem, the most common repair technology is mechanical plugging clamp technology. The implementation of this technology requires divers to complete. But it can also be completed by submarine robots. When the leakage hole of the pipe is relatively small, a special sealant can also to seal the hole. So as to achieve the purpose of pipeline repair.

4.3 Pipe cracks

When cracks occur in the submarine pipeline. The leakage of the pipeline is relatively large. Therefore, the offshore oil and gas field unit must stop normal production at this time. Production can be continued only after the pipeline is repaired. If the pipeline crack is located in the shallow water area of the ocean (less than 5 m). At this time, water welding technology can repair the pipeline. If the pipeline crack location occurs in the deep water area of the ocean (more than 5 m). The open caisson atmospheric dry tank is required to repair the pipeline.

Although cracks in the pipeline generally do not cause deformation of the pipeline. However, pipeline fracture may cause displacement and deformation of the pipeline. Therefore, when carrying out the repair work, the pipeline shall be pulled to the same straight line by the vessel first. Then the workers can carry out the repair work. If necessary, workers can replace the broken pipe section.

5. Summary

(1) With the increase in social demand for energy. As well as the gradual reduction of onshore oil and gas resources, the exploitation of oil and gas resources will shift from land to sea in the future. The submarine pipeline is characterized by high construction investment, strict construction quality requirements, a changeable environment, and complex construction operations. How to ensure the safety of submarine pipelines has become a major problem. This will also have a significant impact on the development of energy in the future. So we need corrosion coupon to detect corrosion

(2) Because it is necessary to ensure the safety of submarine pipelines. The manufacturer shall take measures such as internal corrosion prevention, external corrosion prevention, and cathodic protection. It is better for workers to use stainless steel materials. The production side should also strictly control the fishing boat operation area and shipping channel. Improve welding quality and anti-corrosion coating quality. Pay attention to the periodic inspection of the anti-corrosion coating and bearing condition of the pipe welded junction. Improve the tensile strength of pipe materials and strictly detect environmental changes. Take necessary protective measures in a targeted manner. At the same time, for damaged pipes, necessary repair measures shall be taken according to the degree of damage.