WRC 496:2004

$24.70

Effect of Flange Rotation and Gasket Width on Leakage Behavior of Bolted Flanged Joints: Part 1, Part 2 and Part 3

Published By	Publication Date	Number of Pages
WRC	2004	62

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Description

Part 1: Effect of Flange Rotation and Gasket Width on Leakage Behavior of Bolted Flanged Joints: Effect of Flange Rotation on Leakage Behavior of Bolted Flanged Joints

The current ASME code flange design addresses flange rotation by introducing the concept of an effective gasket width in the calculation of the bolt load instead of the full gasket contact width. Although it is accepted widely and is relied on, it has no theoretical or fundamental basis and above all it has not been verified experimentally. In addition, with the new design rules based on the new gasket constants obtained from ROTT tests conducted on rigid platens, there is a need to reconsider and verify the validity of the effective gasket width concept.

The main objective of the present work is to investigate the effect of the non-uniform gasket contact stress due to flange rotation on the leakage behavior of sheet gasket materials. Both experimental and numerical investigations will be carried out to quantify this effect. Particular attention will be focused on the applicability of the effective width concept and its variation with flange flexibility and load.

Part 2: Effect of Flange Rotation and Gasket Width on Leakage Behavior of Bolted Flanged Joints: Effect of Gasket Width & Gasket Diameter on Tightness Performance, Gasket Constants & Emissions-An Exploratory Experimental Evaluation

This test program is the exploratory phase of a proposed larger experimental study of the effect of two gasket dimensional parameters—width and diameter—on room temperature tightness performance, gasket constants and emissions of modern gasket materials. The proposed project test scheme consists of a full matrix of ROTT tests on different widths (ranging from 0.5 to 1.0 in.) and diameters of gaskets made from a broad range of materials, with only one test per gasket style.

The purpose of the exploratory tests is to confirm the choice of the parameters of the proposed test scheme. It is important to verify that the leakage data obtained from the test scheme will allow the user to clearly quantify the relationship between LEAKAGE and the dimensional parameters WIDTH/DIAMETER.

The exploratory test program was defined in a revised project proposal that consisted of:

1 ROTT test on 3 different widths of the same material (as directed by the committee), for a total of three tests.

This test program was modified to include:

2 repeated ROTT tests on 2 different widths of the same material, for a total of 4 tests.

This change in the test program was implemented to collect data from repeated tests and to determine the level of consistency in the results that could be obtained, especially since the project test scheme proposes to conduct only one test per gasket style.

Part 3: Effect of Flange Rotation and Gasket Width on Leakage Behavior of Bolted Flanged Joints: Effect of Gasket Width on Tightness Performance Gasket Constants & Emissions

This larger experimental study is a follow-up work to an exploratory phase already conducted on the effect of two gasket dimensional parameters which are the width and the diameter on the room temperature tightness performance, gasket constants and emissions of modern gasket materials. The proposed project test scheme consists of a full matrix of ROTT (Room Temperature Tightness) tests on different widths (ranging from 0.5 to 1.0 in.) and diameters of gaskets made from a broad range of materials, with two tests per gasket width. The purpose of these tests is to clearly quantify the relationship between leakage and the gasket width.

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