Posted on November 26, 2018

API RP 941 PDF

Superseded by: API RP Check Published. Price: NOK 2 ,00 (excl. VAT) NOK 2 ,25 (with VAT). Scope: This recommended practice summarizes the. practice (RP) , “Steels for Hydrogen Service at Elevated Temperatures and Pressures in temperature and pressures should follow API RP guideline. Abstract This paper will present an eye-opening look at some of the historic data and letters of correspondence that are the historical basis of the API RP

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This RP also discusses how the resistance of steels to hydrogen damage can be affected by high stress, heat treating, chemical composition, and cladding. Please login or create an account to recommend modifications to this Integripedia definition. The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.

Online Webinar Hosted By: This article provides some 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 and the challenges and pitfalls they have encountered.

The first edition of the recommended practice was originally published in Januaryand the most recent release is the eighth edition, 91 in February Videos Watch educational and informative videos directly related to your profession.

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At temperatures and hydrogen partial pressures below the curve, HTHA is not expected to occur in carbon steel. Ap 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.

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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. The API RP Task Group of the API Subcommittee on Corrosion and Materials is now in the early stages of collecting and verifying data and information to determine if the recommended practice might need to be altered as a result of this new information.

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Looking Behind the Curtain of API RP High Temperature Hydrogen Attack (HTHA) Data – OnePetro

The effects on the resistance of steels to hydrogen at elevated temperature and pressure that result from high stress, heat treating, chemical composition, and cladding are discussed.

Event Calendar Find upcoming conferences, training sessions, online events, and more. Skip to main content. This service is not available if you are a URL user where you do not log in with an email address. Prior to these recent reports, the only reported failures of carbon steel below the API RPFigure 1 curve were in cases of exceptionally high stress, as discussed in Sections 5. The guidelines in this recommended practice can also be applied to hydrogenation plants such as those that manufacture ammonia, methanol, edible oils, and higher alcohols.

High Temperature Hydrogen Attack HTHA is a complex damage mechanism that continues to defy investigators trying to make predictions on the anticipated degree of damage or service life. One curve on that graph is for carbon steel. NOK 2 ,00 excl. If any of your operating sites have experienced unexpected cracking issues associated with carbon steel equipment that may be due to HTHA, please bring those to the attention of API by participating in the Corrosion and Materials Subcommittee and the RP Task Group.

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Last week we mentioned three important tips to consider when addressing high temperature hydrogen attack HTHA. API RP 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.

Company Directory Find relevant products, services, and technologies. Carbon Steel Degradation in High Temperature Hydrogen Service The purpose of this alert is to inform you that there have been several reports of cracking -related issues with carbon steel piping and equipment in high temperature, high pressure hydroprocessing service at operating conditions where carbon steel was previously thought to be resistant to high temperature hydrogen attack HTHA.

Statistics Events Certifications Directories. The agreement lasts for three years, and the fee is charged once per year. Expert Interviews Inspectioneering’s archive of interviews with industry subject matter experts. Inspections will be carried out on a carbon steel pressure vessel — operated in a regime calculated to induce accelerated HTHA — and designed to simulate the real world operations and challenges associated with detecting this phenomenon.

Start Webshop Product catalog Product presentation. Banff, Alberta, Canada Hosted By: Blog Read short articles and insights authored by industry experts. They are widely used in the petroleum refining and petrochemical industries for managing equipment in HTHA service and are available in the public domain. The purpose of this alert is to inform you that there have been several reports of cracking -related issues with carbon steel piping and equipment in high temperature, high pressure hydroprocessing service at operating conditions where carbon steel was previously thought to be resistant to high temperature hydrogen attack HTHA.

The benefits of a subscription: Acronyms Commonly used asset integrity management and inspection acronyms. This week, we’d like to provide the reader with a few helpful resources that deal with the topic of HTHA. By John Reynolds at Intertek. 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.

A summary of inspection methods to evaluate equipment for the presence of HTHA is also included. Is this definition incomplete?