For impure natural gas containing a small amount of H2S, what material is suitable?
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DN300 pipeline, transporting impure natural gas (containing H2S at 0.07 mol%), with unknown water content; the temperature of the fluid is 20°C, the maximum operating pressure of the pipeline is 6.6 MPa, and the flow velocity is relatively low (theoretical maximum of 1.7 m/s). Currently, it is tentatively planned to use 20# steel pipes with dimensions of φ325*16, while valves will still be made of 316L. Is there a problem? I’m especially a bit worried about the weld area.
Due to the presence of hydrogen sulfide in the medium, wet hydrogen sulfide stress corrosion cracking is likely to occur, especially in the weld seams and their heat-affected zones.
Is a thick weld deposit acceptable? And how should one determine the corrosion allowance for the pipe wall?
The method of thickening the weld seam may not yield good results; heat treatment of the weld bead after welding can be employed instead. In other words, a better result is achieved when the hardness of the weld after heat treatment is comparable to that of the base material.
Some material with corrosion resistance is required
Stainless steel performs much better after solution treatment
Our ZS-1033 anti-corrosion coating can be used to prevent sulfur corrosion, chlorine corrosion, and fluoride ion corrosion