Operating Instructions
Tightening
1. Determine the required pressure.
2. Make sure the hydraulic wrench and the reaction arm are in the tightening mode.
3. Pump the hand pump to advance the hydraulic cylinder inside the wrench until the socket stops turning.
4. Release the pump pressure. The hydraulic cylinder inside the wrench will automatically retract and an audible
“click” will be heard. This completes one cycle.
Loosening
1. Make sure the hydraulic wrench and the reaction arm are on the loosening mode.
2. Pump the hand pump to advance the hydraulic cylinder inside the wrench. As pressure builds, the bolt will begin
to loosen.
3. Stop pumping when the socket stops turning.
4. Release the pump pressure. The hydraulic cylinder inside the wrench will automatically retract and an audible
“click” will be heard. This completes one cycle.
5. Continue to loosen the nut with successive cycles until the nut can be removed by hand.
6. Proceed to the next nut.
7. General Torquing Procedure
General Torquing Procedure
The following procedure is for use with TWSD torque wrenches and outlines the basic steps in order to carry out
the torque tightening of a flanged joint. It is important that personal protective clothing (gloves, footwear, safety hel-
met, eye protection) is worn at all times not only by the Operator, but also by any personnel within the work area.
The torquing procedure is compiled around using a single torque wrench, the object of the procedure being to
accurately achieve a pre-determined residual bolt stress.
SAFETY: Prior to commencement of bolt torquing ensure that:
• All necessary safety precautions have been carried out
• Personnel involved in torquing are competent and fully trained in the use of hydraulic torque tools and tightening
techniques.
• The procedure and data to be used is authorized by a responsible Engineer.
• The joints / pipework to be worked on are not ‘live’. Joints must be at zero pressure and free from hazardous
substances.
• Torque value selected must be based upon the lubricant applied.
STAGE 1 Number each bolt consecutively, 1, 2, 3 etc
STAGE 2 Using torque wrenches (if necessary), square up the flanged joint.
STAGE 3 Working in a diametrical sequence (tightening opposite bolts) apply the minimum torque available. i.e.
set pump to lowest possible output (1000psi). Note the sequence used.
STAGE 4 Repeating the above noted tightening sequence, apply approximately 25% of the torque value specified
in the torque data.
STAGE 5 Using the same noted tightening sequence, apply approximately 50%
of the torque value specified in the torque data.
Sheet No.
9 of 12
Rev
Date: 16 July 2007
