API TR 934-F PART 1-2017

$52.65

Impact of Hydrogen Embrittlement on Minimum Pressurization Temperature for Thick-wall Cr-Mo Steel Reactors in High-pressure H2 Service—Initial Technical Basis for RP 934-F

Published By	Publication Date	Number of Pages
API	2017	119

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Category: API

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Description

The objective of this study, in support of API Recommended Practice 934-F [Guidance for Establishing a Minimum Pressurization Temperature (MPT) for Heavy Wall Reactors in High Temperature Hydrogen Service During Startups and Shutdowns], is to establish the technical basis for determining a minimum pressurization temperature (MPT) necessary to avoid internal hydrogen-assisted cracking (IHAC) of weld metal and base plate of temper embrittled 2¼Cr-1Mo steel in high-pressure H₂ service. The threshold condition for the onset of subcritical crack propagation—and its dependencies on dissolved hydrogen concentration, temperature, and steel purity/temper embrittlement—are targeted as particularly important to pressure vessel safe operations. A second objective is to improve the underlying data base for fracture mechanics fitness-for-service (FFS) modeling of IHAC. Both analyses are built on the conservative rising displacement threshold stress intensity factor for IHAC (K_IH).

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