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GASKETS 25.16
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TABLE 25.3 Gasket Materials and Contact Facings Gasket Factors m for Operating Conditions and Minimum Design Seating Stress y
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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TABLE 25.3 Gasket Materials and Contact Facings Gasket Factors m for Operating Conditions and Minimum Design Seating Stress y (Continued)
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TABLE 25.4 Effective Gasket Width
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25.18 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
GASKETS
25.19 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
GASKETS 25.20
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TABLE 25.5 Minimum Recommended Seating Stresses for Various Gasket Materials
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
GASKETS 25.21
GASKETS
TABLE 25.6 Typical Gasket Designs and Descriptions
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GASKETS 25.22
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TABLE 25.7 Safety Factors for Gasketed Joints
apply, and the compression and stress distribution discussed next should be considered by the designer.
25.8 GASKET COMPRESSION AND STRESSDISTRIBUTION TESTING
After a gasket has been selected and designed for a particular application, two simple tests can be performed to determine the gasket s compressed thickness and stress distribution. Inadequate compression or nonuniform stress distribution could result in a leaking joint. The tests can be performed to check for these possibilities and permit correction to ensure leaktight joints. 1. Lead pellet test In this test, lead pellets are used to accurately indicate the compressed thicknesses of a gasketed joint. The pellets, commonly called lead shot, are available from local gun supply stores. A size approximately twice the thickness of the gasket should be used. Lead solid-core solder can also be used if desired; the size requirements are the same. Pellets or solder are particularly well suited for doing this test, as they exhibit no recovery after compression, whereas the actual gasket material will almost always exhibit some recovery. The degree of nonuniform loading, flange bowing, or distortion will be indicated by the variations in the gasket s compressed thickness. To begin, the original thickness of the gasket is measured and recorded at uniformly selected points across the gasket. At or near these points, holes are punched or drilled through the gasket. Care should be taken to remove any burrs. The punched holes should be approximately 11 2 times the pellet diameter. Then the gasket is mounted on the flange. A small amount of grease can be put in the punched holes to hold the lead pellets, if required.The pellets are mounted in the grease, and the mating flange is located and torqued to specifications. Upon careful disassembly of the flange and removal of the pellets, their thicknesses are measured, recorded, and analyzed. Comparison of the pellets compressed thicknesses to the gasket s stress-compression characteristics permits the desired stress-distribution analysis.
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GASKETS 25.23
GASKETS
2. NCR paper test This test utilizes no-carbon-required (NCR) paper for visual determination of the stress distribution on a gasket. NCR paper is a pressuresensitive, color-reactive paper. The intensity of color is proportional to the stress imposed on the paper, which is the same as the stress on the gasket. NCR paper is available from the NCR Corp., the 3M Company, and other paper companies. Various grades are available, but the medium grade is usually chosen. Some papers are only one sheet, whereas others are composed of two sheets. Either type can be used. To begin, the bolt holes are pierced in a piece of the impression paper. The pierced holes in the paper are made slightly larger than the bolts.The paper is placed on the flange, and the mating flange is assembled per torque specifications. When you are using the two-piece carbonless paper, make sure to keep the two papers oriented to each other as they were purchased; otherwise, no impression may result. Upon torquing, the impression is made on the paper. The flange is removed, and the impression is inspected for stress distribution. A judgment of the gasket s sealing ability can now be made. Further analysis can be done by calibrating the load versus the color intensity of the paper. Various known stresses can be applied to the paper and the resulting color impressions identified. The impressions can be compared to the test sample, and then the stress on the sample can be determined. In both the lead pellet and NCR paper tests, gasket manufacturers can be contacted for further interpretation of the results and more detailed analysis.
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