Abstract： SME B16.1:2010 pdf download.Gray lron Pipe Flanges and Flanged Fittings Classes 25,125,and 250. 3.2 Flanged Joints A flanged joint is composed of independent interrelated components; the flanges, the gasket, and the bolting, that are assemb...

SME B16.1:2010 pdf download.Gray lron Pipe Flanges and Flanged Fittings Classes 25,125,and 250.

3.2 Flanged Joints

A flanged joint is composed of independent interrelated components; the flanges, the gasket, and the bolting, that are assembled manually. Proper controls must be exercised in the selection and application for these elements to

attain a joint that has acceptable leak tightness. Special techniques, such as controlled bolt tightening

described in ASME PCC-1, may be used to achieve a tight joint in service.

3.3 Rating Temperature

Temperatures shown for the corresponding pressure rating shall be the material temperature of the pressure-

retaining structure. It may be assumed that the material temperature is the same as the fluid temperature. Use of a pressure rating at a material temperature other than that of the contained fluid is the responsibility of the

user and subject to the requirements of any applicable code or regulation.

3.4 Low-Temperature Ratings

Pressure ratings for temperatures below —29°C (-20°F) should be determined in accordance with low- temperature properties of gray iron (ASTM A 126) as governed by applicable code or regulation.

3.5 Ductility

Gray Iron has little ductility therefore, the resistance of these flanges and flanged fittings to excessive forces and suddenly applied loads is significantly less than for more ductile materials such as steel. The following  precautions are recommended.

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