Material selection for hydrogen safety valves
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This post was last edited by sunjl1981 on 2013-1-6 at 20:55. We intend to install safety valves on the pipelines of our company’s hydrogen system (with a pressure of 9.8 MPa and at room temperature). Based on calculations, the A48Y-160C model was selected; this model features a carbon steel valve body. However, the manufacturer insists that stainless steel must be used. Is there any regulation regarding this? (The pipes we use, as well as the valves on them, are all made of carbon steel.) ) hcbbs !! .
The safety valve for hydrogen may be designed to prevent damage to the valve caused by hydrogen embrittlement; generally, in media containing hydrogen, steel should contain elements such as Mo, Cr, and Ni
This post was last edited by zmxrrx on 2012-9-6 at 12:25. It depends on what material the pipes are made of; what’s the point of installing stainless steel valves if the pipes are made of carbon steel?
For hydrogen pipelines, stainless steel pipes are generally suitable; the material for valves can be stainless steel or non-ferrous metals. Carbon steel has a high carbon content and thus lower safety levels.
For hydrogen as the medium, we use stainless steel valves, pipelines, flanges, and other fittings in accordance with the design requirements.
First of all, stainless steel is definitely better than ordinary carbon steel, and the price speaks for itself. We use carbon steel. The one that transports 1.5 MPa pressure is also made of carbon steel, as designed by Tianchen Institute
This post was last edited by rjs999 on 2012-9-6 at 15:00. For hydrogen-handling equipment, pipelines, valves, fittings, etc., under high pressures (greater than 13 MPa) and high temperatures (greater than 221 degrees Celsius), low-carbon alloy steel should be used. Since your temperature is not high and the pressure is average, carbon steel can meet the requirements.