Inspectioneering
Explore:

API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures

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.

API RP 941 applies to any equipment in refineries, petrochemical facilities, chemical facilities, or hydrogenation plants that happen to operate in environments in which hydrogen-containing fluids are processed at elevated temperatures and pressures. Hydrogenation plants can include any in which the manufacturing of ammonia, methanol, edible oils, or higher alcohols takes place.
 
API RP 941 only covers equipment that runs at high temperatures and does not cover any equipment that runs at below 400°F (204°C). At those temperatures, hydrogen enters the steel due an electrochemical mechanism, which operates under different principles. Likewise, this RP only applies to HTHA thus, even when following the guidelines listed in this RP, steel might not necessarily resist other damage mechanisms in a process stream. It also doesn’t cover damage that might be caused due to rapid cooling of the metal that might occur after it has been removed from high temperature, high-pressure hydrogen service.

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 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 579 - Fitness-For-Service (FFS) 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) PAS 55

Relevant Links

Articles about API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures
    Companies
    Videos related to API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures
      White Papers related to API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures
        Downloads & Resources related to API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures
          Events related to API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures
            News related to API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures
              Interested in equipment reliability & integrity? Sign up for weekly updates.

              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.

              Expert Interviews

              Inspectioneering's archive of interviews with industry subject matter experts.