Re: Bolt tightning/tensioning

From: <Davis>
Date: Mon Jun 18 2001 - 01:11:00 EDT

This is an interesting group. I am in the gasket business and have been waiting for a subject with which I am at least tangentially involved.

There are two great books on the subject of bolting and tensioning:

1. "An Introduction to the Design and Behavior of Bolted Joints", by John Bickford (Marcel Dekker), and
2. "Gaskets and Gasketed Joints", edited by John Bickford (Marcel Dekker).

John Bickford is the acknowledged expert in the field of bolting gasketed joints. These books are excellent and cover almost every aspect of the subject including tensioning and torquing in depth.

The biggest misconception I have seen in industry is that there is, or should be, a specified torque for a given bolt, size, etc. The contention of my company, as well as most of the rest of the gasket manufacturing industry, is that the required torque, or gasket load, is a function of what the gasket needs given the parameters of the application (temperature, media, pressure, etc.). There will typically be a range of loads for the conditions present. These ranges are a maximum load compression and a minimum load required to seal and they will be dependent on the type or style of gasket selected.

At the risk of appearing blatantly capitalistic, our company offers software which guides a user in correctly identifying the gasket loading (and torquing) values for our gasket materials.

>>> "Mandar Apte (Ruwais Site - ENG)" <A.Mandar@TECNIMONT.CO.AE> 06/15/01
11:57PM >>>
Can anyone guide me to find the values of Bolt torque tightning and tensioning for different sizes and ratings on the net.

have a nice time :-)
Mandar

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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Mon Jun 18 01:11:00 2001