[열교환기] Hydraulic Bolt Tensioning에 대한 API 660 요구사항

API 660 8 Edition에서는 Hydraulic Bolt Tensioning 관련 요구사항이 없으며 9 Edition에서 새로 내용이 추가되었습니다.

 

1. (API 660) Para 7.7.6

   Bolt Size가 2” 이상일 경우 Hydraulic Bolt Tensioning 적용이 요구됨

2. (API 660) Para 7.7.7

   Bolt Tensioning 사용 시에는 Bolt 끝부분에 Bolt Tightening 장치를 부착 할 공간이 충분해야 함.

 

1. (API 660) Para 7.7.6

Hydraulic bolt tensioning shall be applied for all bolt diameters equal to or greater than 50 mm (2 in.), or in hydrogen service where bolt diameters are equal to or greater than 40 mm (11/2 in.), or when specified by the purchaser. Alternate forms of tightening followed by bolt elongation verification (e.g. hydraulic torquing in combination with ultrasonic extensometer measurement) may be considered in lieu of tensioning, with approval of the purchaser.

 

 

2. (API 660) Para 7.7.7

When bolt tensioning is used, the bolting shall have additional thread length equivalent to one bolt diameter, extending from the nut at one end, to allow attachment of the bolt-tightening device.