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About This Item


Full Description

API Std 650 establishes minimum requirements for material, design, fabrication, erection, and testing for vertical, cylindrical, aboveground, closed- and open-top, welded carbon or stainless steel storage tanks in various sizes and capacities for internal pressures approximating atmospheric pressure (internal pressures not exceeding the weight of the roof plates), but a higher internal pressure is permitted when additional requirements are met. This Standard applies only to tanks whose entire bottom is uniformly supported and to tanks in non-refrigerated service that have a maximum design temperature of 93°C (200°F) or less.

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Document History

  1. API Std 650

    Welded Tanks for Oil Storage, Twelfth Edition, Includes Errata 1 (2013), Errata 2 (2014), and Addendum 1 (2014)

    • Most Recent
  2. API Std 650


    Welded Tanks for Oil Storage, 11th Edition, Includes Addendum 1 (2008), Addendum 2 (2009), Addendum 3 (2011), Errata (October 2011)

    • Historical Version
  3. API 650

    Welded Steel Tanks for Oil Storage, 10th Edition

    • Historical Version

Amendments & Errata

  1. API Std 650 Addendum 1


    Addendum 1 to Welded Steel Tanks for Oil Storage, 11th Edition

  2. API Std 650 Addendum 2


    Addendum 2 to Welded Steel Tanks for Oil Storage, 11th Edition

  3. API Std 650 Addendum 3


    Addendum 3 to Welded Steel Tanks for Oil Storage, 11th Edition

  4. API Std 650 Errata


    Errat to Welded Steel Tanks for Oil Storage, 11th Edition