| 摘要 |
PCT No. PCT/GB94/02196 Sec. 371 Date Apr. 4, 1996 Sec. 102(e) Date Apr. 4, 1996 PCT Filed Oct. 7, 1994 PCT Pub. No. WO95/10033 PCT Pub. Date Apr. 13, 1995A method of testing the leakage rates from tanks for containing volatile liquids such as petrol or diesel, with a view to determining whether the tank leaks excessively. The tank is at least partially filled during testing in order to save time. The leakage is detected by sealing the tank and measuring the drop in pressure in the tank over a period of time. In order to measure the rate of leakage, a first measurement is taken during which an amount of 380 ml is removed from the tank over a short period whilst otherwise sealed, with the resultant pressure drop being measured as a calibrated value. The tank is then re-sealed and the pressure drop over the period of an hour is compared with the calibrated value. |
