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Old 14 October 2003, 11:42   #11
Country: UK - England
Town: Wincanton,Somerset,UK
Join Date: Jun 2001
Posts: 264
Pressure in relation to temp changes

Originally posted by Cookee
Christopher - Is that all hyperthitical, or have you got a pressure guage that reads from 0 to 2 psi with an accuracy of 0.001 psi?
0.058psi for each degree of temp change is the formula which has to be applied to any tests carried out to check whether a tube is holding air.

To be technical for a moment, all tubes have to meet an ISO standard which is number 6185-3. This standard calls for the tube to be inflated to the approved working pressure, and then put through a 24 hour inflation test. The starting and closing temperatures have to be recorded and for each degree of change, the formula of 0.058psi is applied. The test also requires there to be no more than a 1 % change in the barometric pressure over the 24 hour test period.

All very booring stuff but a requirement under the RCD directive for EC marking.

Chris Hornidge
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