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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 width and diameteron 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

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Published: 2004 Number of Pages: 62 File Size: 1 file , 3.2 MB