What factors influence the choice of wall thickness for X52 pipe in pipeline projects?

Pressure
Internal pressure: The greater the working pressure, the greater the pressure on the pipe wall. In order to prevent the pipe from rupture and deformation, a thicker pipe wall is needed to withstand it. For example, in high-pressure oil and gas transportation, when the pressure is high, the wall thickness of the X52 pipe needs to be increased accordingly.
External pressure: When the pipeline is subjected to external pressure, such as soil pressure and groundwater pressure on buried pipelines, and wind and snow pressure on overhead pipelines, sufficient wall thickness is also required to resist. For example, submarine pipelines are subject to high seawater pressure, and their wall thickness is thicker than that of ordinary land environments.
Medium characteristics
Corrosiveness: If the transport medium is corrosive, such as containing hydrogen sulfide, carbon dioxide, chloride ions, etc., in order to prevent the inner wall of the pipeline from corrosion, thinning, strength reduction and leakage, it is necessary to increase the wall thickness or select X52 pipes with better corrosion-resistant coatings or linings. The wall thickness of pipelines transporting high-sulfur natural gas must be increased.
Abrasiveness: For pipes that transport abrasive media such as solid particles and dust, such as mine tailings conveying pipes, thicker pipe walls can better withstand erosion and wear and extend service life. Their wall thickness is usually thicker than that of pipes that transport ordinary fluid media.
Temperature characteristics: When transporting high-temperature media, the pipeline will generate thermal stress due to thermal expansion and contraction, and high temperature may reduce the strength of the material, so the wall thickness needs to be increased, such as the steam transmission pipeline in a thermal power plant; when transporting low-temperature media, the material toughness decreases, and the wall thickness needs to be appropriately increased to prevent brittle cracking, such as liquefied natural gas pipelines.
Pipeline size
The larger the diameter of the pipeline, the greater the stress generated by the pressure, and the wall thickness required to maintain the pressure bearing capacity and structural stability also increases accordingly. For example, when the pipe diameter increases from DN200 to DN500, the wall thickness may need to be increased by 30% - 50% under the same working pressure.
Installation conditions
Laying method: Overhead pipelines must bear their own weight, wind load, snow load, etc., and the wall thickness requirements are relatively high; underground pipelines mainly bear soil pressure and ground traffic load, etc., and the wall thickness needs to be determined according to the burial depth, soil type, etc. The wall thickness of pipelines above 5 meters above the ground may be 10% - 20% thicker than the same diameter and working pressure pipelines buried within 1 meter.
Connection method: Welding connection has requirements for pipe wall thickness to ensure welding quality and joint strength; flange connection must consider flange size and bolt bearing capacity, and may also need to appropriately increase pipe wall thickness to match the connection. The pipe wall thickness deviation range of welded connection is more strictly controlled.