What does tighten sequentially mean?
What does tighten sequentially mean?
With such a sequence, each bolt is tightened more than once so as to reduce the preload reduction caused by the tightening of the other bolts in the joint.
Which is the most important factor affecting torque?
The primary factors influencing the torque of an engine are: 1) displacement, 2) number of cylinders, and 3) bore to stroke ratio.
Why do you need a good tightening sequence?
A good tightening sequence ensures that an even preload distribution is achieved in the joint. Since joints containing conventional gaskets have a comparatively low compressive stiffness, bolt preloads in such joints are particularly sensitive to the tightening sequence.
Which is the correct torque sequence for a flange bolt?
Flange Bolt Torque Sequence. PASS 2: Torque to a maximum of 60% of the final torque value. PASS 3: Torque to the final torque value (100%). After the three basic torque passes are completed, repeat torquing the nuts at least once using the final torque in a “CRISS-CROSS” manner until no further rotation of the nut is observed. For easy handling,…
Is there a way to measure the tightening torque?
The problem is that there is no practical way to measure the clamping force in normal production situations. Consequently the value of the clamping force is usually referred to as the tightening torque.
How to know the correct sequence of bolts?
Tell the crew to get busy. Give the foreman a calibrated torque wrench and the chart of all 280 bolts with the proper sequence of each bolt drawn on it and five blanks by each bolts. Tell the foreman to come back when the chart is filled in. By the way, check him and the crew two or three times as he completes the chart.
When to use a multiple pass tightening sequence?
If the joint is critical it would be wise to consider specifying a multiple pass tightening sequence. With such a sequence, each bolt is tightened more than once so as to reduce the preload reduction caused by the tightening of the other bolts in the joint.
The problem is that there is no practical way to measure the clamping force in normal production situations. Consequently the value of the clamping force is usually referred to as the tightening torque.
What is the Pocket Guide to tightening technique?
POCKET GUIDE TO TIGHTENING TECHNIQUE This booklet provides an introduction to the technique of us- ing threaded fasteners for assembling components, the ap- plication of power tools for the assembly and the influence of tool selection on the quality of the joint. 1 WHY THREADED . FASTENERS?
Why do you need a torque sequence for a flange?
Flange joints require proper tightening to avoid the leak of the fluid from the joint. Bolt tightening sequence or torque sequence is defined in the torque tightening procedure. Most company has their Flange bolt torque tightening procedure that used during construction and operation of the plant.
