Underground secondary containment and vapor recovery piping system
US5301721A · kind A · utility
Inventor
Key dates
| Filing date | Apr 8, 1993 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Apr 8, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7025
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The underground secondary containment and simultaneous vapor return piping system is adapted for use at a fuel service station which includes a fuel dispenser, a fuel nozzle and nozzle vapor return structure at a dispensing island, an underground fuel storage tank and a primary fuel delivery pipeline. The system comprises an outer, underground, sealed, larger diameter, secondary containment/vapor return pipeline extending around and axially with the inner, primary fuel delivery pipeline from the underground storage tank to the fuel dispenser to establish secondary containment for the fuel delivery pipeline and simultaneously to establish within the secondary containment/vapor return pipeline and around or about the fuel delivery pipeline, a continuous, uninterrupted, axially extending, interstitial space defining a vapor return path, upper fluid coupling termination structure for coupling (a) the interstitial space within the outer secondary containment/vapor return pipeline to the nozzle vapor return structure and (b) the fuel delivery pipeline to the fuel dispenser nozzle, and lower fluid coupling termination structure for coupling (a) the interstitial space within the outer seco…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.