Pipe Fittings and Flanges

Applicable Standards. For pipe fittings and flanges ASTM standards are used to describe the material and ASME or API standards to describe the product type. 

Maximum radial projection of imperfections that are no deeper than the bottom of the serrations, in. Maximum depth and radial projection of imperfections that are deeper than the bottom of the serrations, in. 

Imperfections must be separated by at least four times the permissible radial projection. Protrusions above the serrations are not permitted. 

Supplementary Receiving Inspections. The following additional inspections may be necessary to meet specific requirements of the purchase order for critical applications  

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Concentricity. Verify that pipe fittings and flanges meet the specification (e.g., not honed or machined off center). 

Storage and Handling. The acid should never be allowed to stand in a line completely sealed between two closed valves or check valves. Excessive pressure caused by thermal expansion of the Hquid can cause leaks or pipe mptures. AH lubricants and packing materials in contact with chlorosulfuric acid must be chemically resistant to the acid. Elanged connections are recommended over screwed fittings and flange guards should be used. 

ASTM A338 Malleable iron flanges, pipe fittings, and valve parts for railroad, marine, and other heavy duty service at temperatures up to 650°F (345°C) G5702... 

Piping within battery limits which has a concentration of valves, fittings, and flanges. 

A handy reference for pipe, tube, fitting and flange information is ... 

Fig. 7-106—1" Thermowell installed in threaded pipe fittings and pipe flange fittings...

The coefficient of linear expansion of these alloys in the temperature range of 21 to 100°C (70 to 212°F) is 12.2 X lO C (6.8 X 10"V°F), which is slightly above that of cast iron (National Bureau of Standards). Since these loys have practically no elasticity, it is necessary to use expansion joints in relatively short pipe hnes. Connections for flanged pipe, fittings, valves, and pumps are made to 125-lb American Standarci drilling. 

Extracted from Steel Pipe Flanges and Flanged Fittings, ANSI B16.5—1977 and B16.34—1977, with permission of the publisher, the American Society of Mechanical Engineers, New York. 

Extracted from Steel Pipe Flanges and Flanged Fittings, ANSI B16.5— 1977, with permission of the publisher, the American Society of Mechanical Engineers, New York. Test temperature not to exceed 125 F. ( F — 32) 9 = G to convert pounds-force per square inch to megapascals, multiply by 0.006895. 

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