Sour Service
Sour Service
(OP)
How to determine that you have sour service or seever corrosive environment for a vessel, when the only thing you are provided with is co2 content of the vapor?
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RE: Sour Service
CO2 corrosion is a different issue and many companies, like Shell for example, have developed assessment procedures for CO2 service.
RE: Sour Service
RE: Sour Service
In other to determine the corrosivity of the flüid in a vessel a knowledge the % composition of the vessel's content is required.The following substances are corrosive:CO2,SO2,Chlorides,H2S; acid forming salts and gases in general. The Oxygen content of the vessel aslo determines corrosivity. The temperature of the environment also plays important role. others such as the level of agitation, if liquid has effect,etc
RE: Sour Service
1.0 NACEMR0175: Defines partial pressures of H2S that
would term the service "sour" exceptions to low
pressure systems below 235 psig. "0.05 psia <- if
memory helps"
2.0 Other forms of hydrogen damage such as HIC are not
addressed by NACEMR0175; several IOCs consider
sour service in liquid phase if H2S content exceeds
50 ppm. Noting that HIC failure has occured at
concentrations as low as 20 ppm and the phenomena is
not pressure dependent as is the case with Sulphide
Stress Cracking.
I believe, a new NACE Std was recently issued NACEMR0130 which is comprehensive is addressing sour service.
Cheers
RE: Sour Service