Overview of API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures
API RP 941, Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants, Eighth Edition, is a recommended practice developed and published by the American Petroleum Institute (API). This RP is intended to help identify and manage equipment potentially subject to high temperature hydrogen attack (HTHA) by putting into place practical operating limits for carbon and low alloy steels in hydrogen service at elevated temperatures and pressures. This RP also discusses how the resistance of steels to hydrogen damage can be affected by high stress, heat treating, chemical composition, and cladding. A summary of inspection methods to evaluate equipment for the presence of HTHA is also included. The first edition of the recommended practice was originally published in January 1997, and the most recent release is the eighth edition, published in February 2016.
Is this definition incomplete? You can help by contributing to it.
Share this Topic
Related Topics
API 560 - Fired Heaters for General Refinery Service API 579-1/ASME FFS-1 - Fitness-For-Service (FFS) API 594 - Check Valves: Flanged, Lug, Wafer, and Butt-Welding API 620 - Design and Construction of Large, Welded, Low-Pressure Storage Tanks API 650 - Welded Tanks for Oil Storage API 660 - Shell-and-Tube Heat Exchangers API 661 - Petroleum, Petrochemical, and Natural Gas Industries Air-Cooled Heat Exchangers API RP 1173 - Pipeline Safety Management Systems API RP 1176 - Assessment and Management of Cracking in Pipelines API RP 538 - Industrial Fired Boilers for General Refinery and Petrochemical Service API RP 571 - Damage Mechanisms Affecting Fixed Equipment in the Refining Industry API RP 576 - Inspection of Pressure-Relieving Devices API RP 580 - Risk Based Inspection (RBI) API RP 581 - Risk Based Inspection Technology API RP 75 - Developing a Safety and Environmental Management Program for Offshore Operations API RP 939-C - Guidelines for Avoiding Sulfidation (Sulfidic) Corrosion Failures in Oil Refineries International Organization for Standardization (ISO)Relevant Links
-
BlogJune 27, 2019 By John Reynolds at Intertek
A summary of some of the important topics that were discussed at the Spring Meeting, including the recently-held API Inspection and Mechanical Integrity Summit, subcommittee activities, and progress with the API Individual Certification Program.
-
Reynolds Wrap Up: Highlights from the API Subcommittee on Inspection and Mechanical Integrity (SCIMI) Meetings at the Fall 2018 API Standards MeetingBlogDecember 27, 2018 By John Reynolds at Intertek
A quick summary of some of the important topics that were discussed at the Fall Meeting, including the upcoming API Inspection and Mechanical Integrity Summit, subcommittee activities, and progress with the API Individual Certification Program.
-
September/October 2018 Inspectioneering JournalBy Michael Nugent at Equity Engineering Group, and Timothy Armitt at LINDT, UK
This article discusses the advances in NDE that have given owners increased confidence on how to assess equipment integrity in HTHA service providing risk prioritization of equipment as well as providing the ability to make more reliable run/repair/replace decisions.
-
A New Method for Prioritizing Equipment in HTHA Service for Inspection & Replacement and the Challenges in Obtaining Process Conditions to be Used in the HTHA AssessmentNovember/December 2014 Inspectioneering JournalBy Gerrit M. Buchheim, P.E. at Becht Engineering Co., Inc.
This article provides background on HTHA, discusses some current developments in HTHA inspection and mitigation, and describes how one refiner is instituting an HTHA risk management plan for its refineries along with challenges they have encountered.
-
BlogJanuary 20, 2014 By Jeremiah Wooten at Inspectioneering, LLC.
Last week we mentioned three important tips to consider when addressing high temperature hydrogen attack (HTHA). This week, we'd like to provide the reader with a few helpful resources that deal with the topic of HTHA.
-
November/December 2010 Inspectioneering JournalBy John Reynolds at Intertek
High Temperature Hydrogen Attack (HTHA) is a long known and still occurring degradation issue for fixed equipment construction materials in the hydrocarbon process industry where hydroprocess plants (hydrogen plus hydrocarbons) are in service. Though HTHA failures in these units are the focus of this article, it is important to recognize that HTHA damage can also occur in high pressure boiler tubes, hydrogen producing units, synthetic gas units, ammonia plants and other equipment where hydrocarbons may not be involved but high temperatures are involved.
-
January/February 2005 Inspectioneering JournalBy John Reynolds at Intertek
HTHA falls into multiple categories of corrosion mechanisms, including environmentally assisted cracking, hydrogen assisted cracking, and high temperature degradation. Sometimes HTHA is confused with low temperature hydrogen cracking mechanisms that result from hydrogen being driven into steels by aqueous corrosion reactions.
Inspectioneering Journal
Explore over 20 years of articles written by our team of subject matter experts.
Company Directory
Find relevant products, services, and technologies.
Job Postings
Discover job opportunities that match your skillset.
Case Studies
Learn from the experience of others in the industry.
Event Calendar
Find upcoming conferences, training sessions, online events, and more.
Industry News
Stay up-to-date with the latest inspection and asset integrity management news.
Blog
Read short articles and insights authored by industry experts.
Acronyms
Commonly used asset integrity management and inspection acronyms.
Asset Intelligence Reports
Download brief primers on various asset integrity management topics.
Videos
Watch educational and informative videos directly related to your profession.