Methods and system for determining leaks in underground liquid storage tanks and the like
US4739648A · kind A · utility
Inventor
Key dates
| Filing date | Feb 13, 1987 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Feb 13, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/3236
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for detecting leaks over a designated test period in liquid storage tanks and like systems having underground tanks which are connected with good withdrawal systems. A fill pipe provides for obtaining a differential pressure measurement reflecting a difference in head of adjacent columns of liquid in the tank. One of the heads is stabilized at the beginning of the test, and prevented from changing as a result of any loss of liquid due to leak over the test period, while the other head is permitted to change with a lowering of surface level due to leaks. Both heads respond in the same way to a change in temperature which occurs during the test period. The differential pressure is monitored and any variation over the test time period is indicated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.