API TR 6AF3 PDF
Technical Report 6AF3 provides design guidelines for API 6BX style flanges utilized as end and outlet connectors in high-pressure, high-temperature (HPHT) surface and subsea applications.
For this document, HPHT applications are intended to mean flanges assigned a temperature rating greater than 350 °F or a pressure rating greater than 15,000 psi.
This document does not address thermal effects including gradient effects or subsea production equipment. Service temperature ratings above 550 °F (288 °C) are outside the scope of this technical report. The flange designer should address thermal effects when designing flanges rated for high temperatures.
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
API Specification 6A, Specification for Wellhead and Tree Equipment API Standard 6X, Design Calculations for Pressure-containing Equipment
API Technical Report 6AF, Technical Report on Capabilities of API Flanges under Combinations of Load
API Technical Report 6AF1, Technical Report on Temperature Derating on API Flanges under Combination of Loading
API Technical Report 6AF2, Technical Report on Capabilities of API Integral Flanges under Combination of Loading—Phase II
ASME Boiler and Pressure Vessel Code Section VIII, Division 2—Alternative Rules
ASME Boiler and Pressure Vessel Code Section VIII, Division 3—Alternative Rules for Construction of High Pressure Vessels
Robert Eichenberg, “Design Considerations for AWHEM 15,000 psi,” ASME Paper 57-PET-23, 1957
Robert Eichenberg, “ Design of High-Pressure Integral and Welding Neck Flanges with Pressure-Energized Ring Joint Gaskets, Journal of Engineering for Industry, 1964
Joe R. Fowler, “Sealability of API R, RX & BX Ring Gaskets,” PN 90-21, Stress Engineering Services, Inc., Report prepared for API, January 1994
