How Can We Ensure The Smooth Operation Of Submarine Pipelines?

The Offshore Pipe  Installation Company requires that the design of submarine pipelines should be standardized. Submarine pipelines have a large investment and high maintenance costs. Therefore, when designing, it is hoped that there will be no problems. In this regard, DNV has regulations. At present, our country's marine management design refers to this specification, and plans are made in different sections. A high security level is required for the range of personnel activities within 500 meters near the platform, landing points, etc.

At the same time, the classification of DNV is very meticulous. The requirements for oil pipes, gas pipes, and water pipes are different. The transmission medium is toxic and non-toxic, and the design requirements are also different. For example, for high-pressure gas pipelines, pipeline materials are required to have crack arrest performance.

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In addition, the reality of many offshore operations also needs to be taken into account in the design of the subsea pipeline. For example, in some emergency situations, ship operations need to be anchored on the ship. Therefore, in the design of submarine pipelines, it is necessary to avoid pipelines passing through anchorages and routes as much as possible, but in the case of pipelines that have to cross routes in special sections, the designer should consider the situation of the largest tonnage ship anchoring and dragging when designing. The most likely damage. To backfill such pipelines to ensure soil strength.

Emergency response must have a process

In the daily operation and maintenance process of subsea management, it is generally divided into internal and external inspections. The external inspection can check whether there is a change in the buried depth, whether the seawater erosion causes a span, whether the anode block is functioning, and whether the external anti-corrosion layer is intact, etc.

Internal detection, that is, using a smart ball to determine the internal corrosion of the transport medium. According to the internal inspection results, the strength and life of the subsea pipe itself can be analyzed, and the corrosion status of the pipeline can also be analyzed according to the parameters of the transport medium and other parameters. The composition of the medium conveyed by the submarine pipeline is not static, and the composition of the corrosion inhibitor (protective agent for delaying corrosion) should be adjusted during operation to avoid the increase of internal corrosion. The normal internal testing frequency is once every five years. When hidden dangers are found, the frequency of internal testing should be encrypted. When the local pitting corrosion affects the normal transportation of the pipeline, it needs to be strengthened locally, and the method of hitting a mechanical clamp can be used, which is equivalent to adding a layer of pipe outside the pipe.

In case of a dangerous situation in the subsea pipeline, the engineer can determine whether there is a leak from the pressure change (pressure difference) at the inlet and outlet. When the pipe is damaged due to external force and needs to be replaced locally, in the shallow water area, the pipe can be lifted and welded in place to replace a new pipe; in the deep water area, special tools must be used to cut and connect underwater, the construction cost is very high.

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