API RP 751 - Safe Operation of Hydrofluoric Acid Alkylation Units

Explore this topic

API RP 751, Safe Operation of Hydrofluoric Acid Alkylation Units, is a recommended practice developed and published by the American Petroleum Institute (API) that provides guidance to refinery operators on the safe operation of hydrofluoric acid (HF) alkylation units, which are key refinery assets used in the production of cleaner transportation fuels required to meet today’s more stringent environmental standards. This RP was originally published in 1992, and the most recent 5th Edition was released in August of 2021.  

API RP 751 includes recommendations (“should”) and certain requirements (“shall”) on hazards management, operating procedures, worker procedures, material inspection and maintenance, transportation and inventory control, relief and utility systems, and risk mitigation. Moreover, the document provides additional information on the elements of a comprehensive HF audit, HF exposure limits, and corrosion & materials considerations specific to HF alkylation units.

CLICK HERE to read about some of the key changes to the 5th Edition.

Related Topics

Relevant Links

Topic Tools

Share this Topic

Contribute to Definition

We welcome updates to this Integripedia definition from the Inspectioneering community. Click the link below to submit any recommended changes for Inspectioneering's team of editors to review.

Contribute to Definition
Articles about API RP 751 - Safe Operation of Hydrofluoric Acid Alkylation Units

There are some significant changes coming in the fifth edition of API RP 751 on Safe Operation of Hydrofluoric Acid Alkylation Units in the section on Mechanical Integrity, Damage Mechanisms and Maintenance Work Practices.

Authors: John Reynolds
July/August 2004 Inspectioneering Journal

The following is the final part of a 2-part series outlining the relationship between key operating parameters and corrosion that has been used to develop a set of guidelines to define an operating envelope.

May/June 2004 Inspectioneering Journal

Corrosion and fouling in HF Alkylation Units are closely linked to feed quality and operating conditions. This article outlines the relationship between key operating parameters and corrosion that has been used to develop a set of guidelines to...

Partner Content

Auto-refrigeration can impose low temperatures onto process vessels and piping causing them to be at risk of brittle fracture, the sudden break-before leak phenomena that can result in catastrophic rupture of the equipment.

    Inspectioneering Journal

    Explore over 20 years of articles written by our team of subject matter experts.

    Company Directory

    Find relevant products, services, and technologies.

    Talent Solutions

    Discover job opportunities that match your skillset.

    Case Studies

    Learn from the experience of others in the industry.


    Inspectioneering's index of mechanical integrity topics – built by you.

    Industry News

    Stay up-to-date with the latest inspection and asset integrity management news.


    Read short articles and insights authored by industry experts.

    Expert Interviews

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

    Event Calendar

    Find upcoming conferences, training sessions, online events, and more.


    Downloadable eBooks, Asset Intelligence Reports, checklists, white papers, and more.


    Watch educational and informative videos directly related to your profession.


    Commonly used asset integrity management and inspection acronyms.