Bolts are properly tightened utilize their elastic characteristics and should act like springs to function. It is created across the joint elements when a load is applied. The bolt expands and attempts to return back to its original length.
When a load is removed, the elongation added within the elastic limit is relieved, and the level of elongation rises as more load is applied. The bolt reaches its ultimate tensile strength (UTS) when more load is applied to the point where it starts to fail. If further force is given to the bolt at the UTS point, it will expand until it eventually breaks.
Bolt failure can be avoided by paying attention to:
- The bolt’s grade
- The apparatus in use
- The ability of the operator to use the proper controlled bolting techniques
What do you understand of bolt tensioning services?
The bolt is stretched and preloaded during the bolt tensioning services. After the tensioner load is released and the nut is tightened appropriately, the bolt will revert to its initial length. Tension is produced by this spring-like movement, which applies a force that clamps across the bolted application. Because bolted joints are frequently among the most prevalent components in industrial components, each joint’s dependability is crucial. HTL has created precise methods for sensing and delivering force to joints consistently.
Tensioners are frequently used for flange maintenance, giving the customer flexibility with leak-free operations and simple maintenance—essential elements for any project starting in the petrochemical or other industries.
Benefits of Techniques for Tightening Bolts
- Consistent, regulated, and precise bolt loads
Techniques for controlled bolting involve the use of tools with regulated outputs. The appropriate computations are found to give the user the necessary tool settings, guaranteeing convenience.
- Regularity in bolt loading
This is critical for joints with gaskets since the gasket needs to compress evenly and consistently to properly function and avoid harm.
- Secure functioning
Since controlled bolting equipment necessitates competent operators according to precise rules, the safe functioning of bolting equipment avoids the hazardous acts of manual, uncontrolled tightening.
- Shorter operation times
By decreasing tightening moments and operator fatigue, bolting tooling boosts production by taking the place of manual labour.
- Consistent and dependable outcomes
Known results are routinely achieved when trained personnel adhere to precise protocols and use equipment that has been calibrated and tested.
- The correct outcomes the first time
Ensures that the joint is correctly assembled and tightened on the initial time, saving time and resources.
What number of tensioners are needed?
One hydraulic tensioner is sufficient to tension most applications. It is recommended that the operator utilize a single hydraulic tensioner every other or fourth bolt in cases where several bolts need to be tensioned.
For circular flanges using a minimum of four hydraulic tensioners is advised to boost job productivity.
The following are possible effects of uneven bolt tensioning:
- Too-loose or overloaded bolts
- Leakage and/or gasket crushing
- Tensioning at less than 100%
In situations when concurrent tensioning equipment on bolts is not possible, a minimum of three tensioning forces may be used.
Before beginning any hydraulic tensioner rental tightening process, lubricate the nuts and bolts and hand-tighten them until they come flush with the flange. Please ensure that you should utilize the proper sequential bolt ordering for the flange while tightening the bolts.