For Leak Free Bolted Joints
Correct Bolt Tension for Secure Joints
A bolted joint obtains its superior characteristics through proper clamping force on the gasket contact surfaces. The clamping force, or bolt load, is caused by correctly tensioned bolts. If the bolts have not reached the required tension, there is insufficient clamping force and the joint is not up to specification. If execessive clamping force is used, the bolt, gasket, and/or the flange may be damaged. In either case, a leak is the probable result. Therefore, it is imperative that the proper clamping force is achieved. Direct Tension Indicators provide the means to measure bolt tension (bolt load).
The Many Benefits of Direct Tension Indicators (DTI's)
ACCURACY! The bolt is tightened to a specified DTI gap, which has been achieved directly by clamping force or tension. This means you are measuring the actual outcome of your efforts instead of work input. Accuracy is not affected by bolt grip length.
CONSISTENCY! Direct Tension Indicators are manufactured in small lots, and each lot is tested for consistency. A test report is kept and the lot number is marked on each DTI. When the DTIs are compressed to the specified gap, each bolt is proven to be tensioned to the specified load.
COST SAVINGS! Inspection is cost effective with Direct Tension Indicators, because they are in use as long as the fastener is. DTIs do not require any special training to use or to inspect, and they help prevent rework.
VERSATILITY! The DTI can be used under the bolt head or at the nut end with a hardened washer.
SIMPLICITY AND EASE OF INSTALLATION! DTIs are easy to install with standard tools - proper clamping force is unmistakable.
EASE OF INSPECTION! The Direct Tension Indicator provides immediate visual proof that the bolt has been correctly tensioned. All you need is a feeler gauge.
