Question: Water handling facilities (less than 0.45 MPa) I really don’t know what does it mean? It means that the possibility of corrosion is low enough to be excluded from the standard requirements? Or the consequence of the problem is minimum? Can we conclude from the above paragraph that, low pressure water handling facilities, has no gas to be released which may produce SSC or any hydrogen problems?
Water handling facilities have typically low service pressure, a near neutral pH and they usually contain trace amounts of H2S. Consequently their sour service severity is quite low. However, it is the responsibility of the user to check whether these assumptions are correct for the particular equipment considered.
This question is in relation to the Scope of NACE MR0175/ISO 15156
Reference: ISO 15156 Maintenance Panel Inquiry #2009-15