API TR 6F1-1999

$35.10

Technical Report on performance of API and ANSI – End Connections in a Fire Test according to API Specification 6FA

Published By	Publication Date	Number of Pages
API	1999	42

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Category: API

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Description

The Production Department of API ?rst published in 1978a procedure for ?re testing valves. The current procedure is API Spec 6FA, API Speci?cation for Fire Test for Valves (1)Basically, the Speci?cation calls for a ?re with an Average temperature of 1400°F–1800°F to be applied for 30 minutes to a valve pressurized with water to detect leakage.

Since end connections usually are included in these tests, they become potential failure points for a ?re-tested valve assembly. Since end connections are standard products, API has sponsored several research projects to de?ne the ability of end connections to pass the ?re test. Ten standard end con-nections of various sizes, types, and pressure ratings weretested in 1979 (2). (PRAC-7921)

Two subsequent research projects (3, 4) in 1980–81(PRAC 80-33) and 1981–82 (PRAC 81-33) resulted in procedures to analytically predict the performance of ?angedand clamped connections to the ?reenvironment.

This procedure basically is composed of four parts: (a)predicting the temperature distribution in the ?ange, (b) predicting the preload loss, (c) predicting the performance of the various seals with the reduced preloads which occur in a ?re,and (d) predicting whether or not yielding of bolts is likely to occur. Signi?cant yielding will lead to leakage either during the ?re or shortly afterward.

A fourth project (PRAC-83-33) (5) evaluated the standard end connections in API Speci?cations 6A (6) and 6D (7)using these analytical procedures.

This report summarizes the results of all the projects. In addition, the appendixes present the analytical procedures used to generate the performance prediction of section 3.

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