standards. NOTE Free publications with an asterisk are subject to a $10.00 handling charge for each total order, plus actual shipping charges. INSPECTION OF REFINERY EQUIPMENT. API 510 ?. Pressure Vessel Inspection Code:
API RP 941 covers hydrogen at high temperatures and a basic figure is the Nelson diagram. The diagram is a synthesis of years of experience. It describes the suitability of different materials with temperature and partial pressure of hydrogen as parameters. This diagram demonstrates the benefit of reporting and registration
HTHA Standard. The operating limits for steels can be empirically described using the operating temperature and the hydrogen partial pressure, as originally discussed by Nelson in 1949 and in API recommended practice (RP) 941, “Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum.
Steels for Hydrogen Service at. Elevated Temperatures and. Pressures in Petroleum Refineries and Petrochemical Plants. Downstream Segment. API RECOMMENDED PRACTICE 941. SIXTH EDITION, MARCH 2004
12 Jun 2016 Full-text (PDF) | Components operating in hh temperature hydrogen service are susceptible to hydrogen attack. The API 941 Nelson Curves are an empirical formulation designed to identify safe operationl limits with respect to temperature and hydrogen partial pressure. Inthis paper, mechanism based
14 Aug 2012 damaged carbon steel refinery line. Decarburization and fissuring region caused by hydrogen depleting the iron carbides. Nital etch. Fig. 3 Illustration of API 941 (Nelson) curve—material selection for equipment exposed to hydrogen at elevated temperature and pressures should follow API 941 guidelines.

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March 2018