Method and apparatus to test a shutdown device while process continues to operate
US6631882B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Aug 9, 2001 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Feb 15, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K37/0083
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for testing an emergency shutdown valve without disrupting the flow of the process during a testing procedure. The apparatus includes an emergency shutdown valve capable of moving about 25% beyond a fully opened position to a fully closed position. The emergency shutdown valve has a coefficient of flow which is equal to or greater than the normal coefficient of flow for the process when the valve is moved about 25% beyond its fully opened position which provides a means for moving the shutdown valve 50% of its total movement without affecting the coefficient of flow for the process. The apparatus also includes a programmable logic controller including a timer and counter, a valve actuator, valve positioner, and an alarm device for controlling the positioning and movement of the shutdown valve during a timed and scheduled shutdown valve testing process without affecting the flow of the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.