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 Subcommittee Scope

Welcome to the home page for the CRE Subcommittee on Heat Transfer Equipment (SCHTE). This site offers information on upcoming meetings, allows questions to be posted for the upcoming roundtable discussions, and provides information on the status of standards and due dates for documents managed by the SCHTE. Documents under development and revision are also available for review. Rosters may be posted for information and use among the subcommittee and should not be distributed outside of the members.

Mission: The SCHTE prepares, reviews and updates relevant standards, provides forums for keeping abreast of industry technology, maintains liaison activities with other standard-writing bodies, sponsors general interest sessions and provides the US input to related standards in ISO and IOGP.

SCHTE is divided into two main groups- fired and unfired equipement, with unfired comprised of tubular and non-tubular exchanger groups. 

The following documents are under the purview of the SCHTE:

Fired Standards

  • Std. 530 - Calculation of Heater Tube Thickness in Petroleum Refineries
  • RP 534 - Heat Recovery Steam Generators
  • RP 535 - Burners for Fired Heaters in General Refinery Services
  • Std. 536 - Post Combustion NOx Control for Equipment in General Refinery Services
  • *ANSI/API Std. 537 - Flare Details for General Refinery and Petrochemical Service
  • Std. 538 - Industrial Fired Boilers
  • *Std. 560 - Fired Heaters for General Refinery Services
  • Std. 561 - Reforming Furnaces for Hydrogen and Syngas Production (proposed new American National Standard)
  • Std. 565 - Thermal Reactors in Sulfur Recovery Units for General Refinery Services
Unfired Standards
  • Std. 660 - Shell-and-tube Heat Exchangers
  • Std. 661 - Petroleum, Petrochemical, and Natural Gas Industries--Air-cooled Heat Exchangers
  • Std. 663 - Hairpin-type Heat Exchangers
  • Std. 664 - Spiral Plate Heat Exchangers
  • Std. 667 - Plate & Frame Heat Exchangers for Gen. Refinery Services (proposed new Std. to replace Std. 662, Part 1)
  • Std. 668 - Brazed Aluminum Plate-fin HEs for Gen. Refinery Services (proposed new Std. to replace Std. 662, Part 2)
  • RP 669 - Heat Recovery Systems (proposed new Recommended Practice)
  • Std. 810 - Welded Plate-Block Heat Exchangers (proposed new American National Standard)

Tubular Exchanger: API 660, API 661, API 663, and API 669

Non-tubular ExchagerAPI 664, API 667, API 668, and API 810

*NOTE: ANSI/API Std. 537 and API Std. 560 are under continuous maintenance. Revision proposals may be submitted at any time for consideration and should be submitted through the API staff contact for the SCHTE.​

Chair: Allen Miller, Shell Projects and Technology (US)
Vice-Chair: Eric Barta, Exxon Mobil
​Secretary: Sarah Radovcich, Fluor ​


The 2022 Fall API Refining and Equipment Standards Meeting will be held on November 14-18 in New Orleans at the Hyatt Regency. 

Click on “Calendar of Events" under Links for registration, meeting logistics, and other information.​​

 API Contact

American Petroleum Institute
200 Massachusetts Avenue, NW
Washington, DC 20001

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 Ballots and Draft Review

 Ballot IDStatusResultsOpensClosesDescription
Committee ID : 19082308SCHTE Heat Transfer Consensus Group - Fired Equipment
5910ClosedIn Progress10/03/202210/17/2022Reaffirmation Ballot for API 536 ed. 3, Post-combustion NOx Control for Equipment in General Refinery Services
5860ClosedIn Progress09/12/202210/31/2022API 537, Flare Details, 3rd Edition, Addendum 2
5914ClosedResolution Required10/05/202211/06/2022API 534 ed. 3 (COMMENT ONLY), Heat Recovery Steam Generators for Combustion Turbine Exhaust Applications
5922ClosedIn Progress10/07/202211/06/2022API 561 ed. 1 (COMMENT ONLY), Reforming Furnaces for Hydrogen and Synthesis Gas Production in General Refinery and Petrochemical Services
5950ClosedIn Progress11/04/202212/30/2022API-673 - Centrifugal Fans
5996ClosedPass02/14/202302/28/2023Reaffirmation Ballot for API 534 ed. 2, Heat Recovery Steam Generators
6021ClosedIn Progress03/06/202304/28/2023RP 982, 1st Edition - Inspection and Assessment of Refractory Linings
6032ClosedIn Progress03/20/202305/04/2023API 534 3rd edition - Heat Recovery Steam Generators for Combustion Turbine Exhaust Applications
6063ClosedIn Progress04/17/202305/14/2023API 560 e5 Addendum 3 - Comment-only on redline changes
6133OpenIn Progress08/23/202310/04/2023API Std 673 Centrifugal Fans 4th Ed
6154OpenIn Progress10/19/202310/27/2023SCHTE - API RP 535 4th Edition
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