maddocks
Petroleum
- Aug 21, 2001
- 343
While working at a facility yesterday, we discovered that most of the plant BDV's are staged to allow for staggered relief loads on the system. Our shutdown proceeded with a manual pushbutton to confirm ESD functionality, however, with 4 or 5 BDV's staged (no-one on site realized this), it called into question the following. Staging of BDV's seems to work fine when we have complete control of the BDV outputs - but what happens when we lose full control of the 24 VDC outputs and all the valves want to open simultaneously. Any ideas on staging?
