VAM Book - VAM Services
VAM Book - VAM Services
VAM Book - VAM Services
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Page 46, paragraph 3, should read:<br />
The number of turns applied to the connection after shouldering is known<br />
as delta turns. It is now a requirement that these are within set parameters<br />
for all <strong>VAM</strong> connection that have a torque shoulder.<br />
Delta turns must be within the values listed below<br />
<strong>VAM</strong> TOP HT (carbon and<br />
Chromium)<br />
Other <strong>VAM</strong> connections 0.01 and 0.10<br />
0.01 and 0.13 non linearity permitted<br />
straight line from shoulder<br />
to final only<br />
The slope of the graph between the shoulder point and the final torque must<br />
be a straight line with a slope greater than 5 x optimum torque. This can be<br />
expressed with the formula below.<br />
final torque - shoulder torque<br />
optimum torque x delta turns > 5<br />
Some make-up companies do this calculation with their software and identify<br />
any make-ups that have a slope out with the criteria.<br />
Errata<br />
v 24 th August 2011
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