Regarding natural gas pipeline venting
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According to GB50251 \"Code for Design of Gas Pipeline Engineering\", the materials for vent pipelines, fittings, and vent stacks should be selected with consideration given to low-temperature and low-stress operating conditions. The operating pressure for this project ranges from 4.0 to 9.1, and there are high-pressure and low-pressure vent systems. I would like to know what material should be used for the vent pipes under these conditions. For our project, they simply use ordinary pipes, but I think that’s a problem.
If possible, make public the feasibility study materials for the production project and the design reports from the design institute!
Hourly vent volume (104 Nm3/h): 5.15. The operating pressure for the main pipeline is 9.1 MPa; a pipe with a diameter of DN300 is used, and the height of the vent tower is 20 meters. Is there any issue regarding the use of materials suitable for low temperatures in this torch?
The poster needs to confirm whether low-temperature and low-stress conditions exist Check whether there is a situation of low temperature Is it due to the lower ambient temperature, the heat absorption during vaporization during venting, or some other operating condition?
During venting, vaporization absorbs heat; therefore, low-temperature operating conditions need to be taken into account, which relates to the material of the venting pipes and vents
This post was last edited by lovelife1997 on 2018-5-18 09:58. The discharge temperature of high-pressure natural gas pipelines is very low. In the past, alloy stainless steel was commonly used as the material for such pipelines. However, for pipelines operating in low-temperature conditions, the material selection cannot be based solely on low-temperature requirements; stress calculations must also be conducted to determine whether the conditions satisfy those of low temperature and low stress. This helps decide whether carbon steel can be used, providing a basis for material selection and ensuring economic efficiency while maintaining safety. Appendix: (The minimum operating temperature for 20# carbon steel is -20 degrees) ； The minimum operating temperature for low-alloy steel 16Mn is -40 degrees Celsius ； The minimum operating temperature for stainless steels such as 304/316 is -196 degrees Celsius