# Pre-procedure Checks

1. Check that each bolt to be tensioned is visually free from obvious thread defects. Make sure all Nuts and Thread Inserts are free to rotate on the bolts. Try a Thread Insert on a bolt and make sure they are correct mating threads.

2. Ensure there is sufficient stud protruding from the top of the nuts. A minimum of 1 x stud diameter is essential and also a minimum of 2 x D from top of the bolt to the base of the nut.

3. Also make sure full thread engagement is available through the hexagon nut on the opposite end of the studs being tensioned.

4. Check that all calculations pertaining to the tensioning procedure, including pressures, bolt loads, etc are available and have been reviewed by a qualified engineer with bolting experience.

5. Ensure that personnel are fully trained in bolt tensioning procedures and have thoroughly read this guide and safety notes.

6. Ensure the pump reservoir is filled and an adequate oil volume is available.

7. Ensure the correct and preferred grade of oil is used in the pump. Refer to the applicable pump product information document. If the incorrect grade of oil is used, the life and performance of the system will deteriorate.

8. Be sure all personnel are aware of the maximum working pressure and maximum piston stroke of the tensioners. These details are hard stamped on the tensioner bodies

WARNING

Atlas Copco supply many special bolt tensioners, never assume you are working with a standard CTST range tool. Always check the hard stamping on the load cell to verify the actual tool specifications.

## Applies to: