Bolt Materials - Atlas Copco Netherlands
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Application of topside tensioners

Bolt Materials

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What does the software do?

The software assumes that adequate strength flange materials are being used. Stainless Steel 316 flanges are not to be tensioned with the recommended bolt stresses. 

Standard ANSI B16.5 Flanges manufactured from material with yield strength equal to or greater than 247N/mm2 (35840lbs/In2) 

ANSI B16.5 Flange specification does not implicitly specify a minimum target bolt stress. The software will suggest recommended target bolt stress values for these flanges. The recommended values are based on the experience of Atlas Copco and are used without any guarantee or liability to Atlas Cocpo.

The recommended bolt stress values assume that flange material yield strength is equal to or greater than 247N/mm2 (35840lbs/In2). 

The following flange materials or equivalents are suitable for the recommended bolt stresses.

- ASTM A105

- ASTM A182 Grades F65>

- ASTM A182 Grade F60

- ASTM A182 Grade F52

- ASTM A182 Grade F50

- ASTM A182 Grade F51

- ASTM A350 Grade LF2

- ASTM A350 Grade LF3

- ASTM A694 Grade F52

- ASTM A694 Grade F60

- ASTM A694 Grade F65