material suggestions for high CO2 and low H2S environments
material suggestions for high CO2 and low H2S environments
(OP)
just looking for material suggestions for a gaseous environment operating at 300PSI.
it's currently about 50% CO2 and 50% H2 were processing, with only around 50PPM H2S. the gas stream is also humid, 100%RH.
considering we're making pressure vessels out of the material, it must be manufacturable.
we can't have any rust form on the inside of these vessels. it messes with our valves.
it's currently about 50% CO2 and 50% H2 were processing, with only around 50PPM H2S. the gas stream is also humid, 100%RH.
considering we're making pressure vessels out of the material, it must be manufacturable.
we can't have any rust form on the inside of these vessels. it messes with our valves.
RE: material suggestions for high CO2 and low H2S environments
My experience is from amine units stripping H2S and CO2 out of natural gas and just stripping CO2 out of natural gas.
Regards,
Rocco8@flash.net
RE: material suggestions for high CO2 and low H2S environments
Austenitic stainless steels, as mentioned by Rocco8, are apparently immune to hydrogen attack, but allow atomic hydrogen diffusion and its probable attack to the underlying carbon steel when protected by a St St thin loose lining or integral cladding. Atomic hydrogen forms by dissociation of molecular hydrogen at temperatures above 500F and partial pressures above 100 psia.
Besides, when planning the construction of vessels it would be in line to consider the thermal expansion of the St St steel usually much larger than for carbon steel.
RE: material suggestions for high CO2 and low H2S environments
API 941, "Steels for Hydrogen Service at Elevated Temperatures and Pressures in the Petroleum and Petrochemical Industries"
I think we have used Duplex 2205 in a similar type service, though with much less pressure.