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API Std 620 Design and construction of large, welded, low-pressure storage tanks

RegSenseAnhydrous AmmoniaSafety & HealthAmerican Petroleum Institute (API)General Industry SafetyFlammable LiquidsCompressed GasesHydrogenConsensus StandardsIndustry Consensus StandardHazardous Materials Safety - OSHAEnglishFocus AreaUSA

This standard covers the design and construction of large, welded, low-pressure carbon steel aboveground storage tanks. The standard covers tanks that have a single vertical axis of revolution and that are designed for metal temperatures not greater than 250°F and with pressures in their gas or vapor spaces not more than 15 psig.

Current edition

  • API Std 620 (2013) Design and Construction of Large, Welded, Low-Pressure Storage Tanks, 12th Edition, incl. Addendum 1 (2014) and Addendum 2 (2018)

Incorporation by reference

The following editions have been incorporated by reference (IBR) into the Code of Federal Regulations (CFR):

IBR approved for Overview of requirements IBR approved edition
29 CFR 1910.103(c)(1)(i)(a)Employers must ensure hydrogen storage containers are designed, constructed, and testedin accoradance with appropriate requirements of the ASME Boiler and Pressure Vessel Code, Section VIII-Unfired Pressure Vessels (1968) or applicable provisions of API Standard 620, Recommended Rules for Design and Construction of Large, Welded, Low-Pressure Storage Tanks, Second Edition (June 1963) and Appendix R (April 1965).API 620 (1970) Recommended Rules for Design and Construction of Large Welded Low Pressure Storage Tanks, Fourth Edition., including Appendix R.
29 CFR 1910.106(b)(1)(iv)(b)(1)Employers must ensure low-pressure tanks are built in accordance with the following consensus standards: (1) American Petroleum Institute Standard No. 620. Recommended Rules for the Design and Construction of Large, Welded, Low-Pressure Storage Tanks, Third Edition, 1966.API 620 (1970) Recommended Rules for Design and Construction of Large Welded Low Pressure Storage Tanks, Fourth Ed., including Appendix R.
29 CFR 1910.111(d)(1)(ii) Employers must ensure containers with a design pressure exceeding 15 p.s.i.g. are constructed in accordance with 1910.111(b)(2), and the materials must be selected from those listed in API Standard 620, Recommended Rules for Design and Construction of Large, Welded, Low-Pressure Storage Tanks, Fourth Edition, 1970, Tables 2.02, R2.2, R2.2(A), R2.2.1, or R2.3. API 620 (1970) Recommended Rules for Design and Construction of Large Welded Low Pressure Storage Tanks, Fourth Ed., including Appendix R.
29 CFR 1910.111(d)(1)(iii) Employers must ensure containers with a design pressure of 15 p.s.i.g. and less are constructed in accordance with the applicable requirements of API Standard 620 including its Appendix R. API 620 (1970) Recommended Rules for Design and Construction of Large Welded Low Pressure Storage Tanks, Fourth Ed., including Appendix R.

How to purchase

Standards are available for purchase from the American Petroleum Institute (API), see www.api.org.

['Hazardous Materials Safety - OSHA']
['Flammable Liquids', 'Hydrogen', 'Compressed Gases', 'Anhydrous Ammonia']
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