OT Don't read this (was Re: Altair MBL source)

Oh yeah, getting back to the "manual override" OT thread: Our halon dump system has at least three manual overrides: 1. A switch on the wall by the door to initiate a dump. (I don't know if the delay and alarms get sounded before this kind of dump or not.) 2. A momentary toggle switch on the wall to inhibit a dump. I think the idea behind it being momentary is that it's a dead-man switch - when you abandon the room the dump will go ahead without you :-). 3. One intentional non-electronic way to initiate a dump. It's this big brass handle on the valve mechanism. My cow orkers have examined this and we think that after the valve opens a little bit, the flow will blow the valve the rest of the way open. And then there's the fourth way, which is to have a contractor messing around with the electric valve solenoid and trip it when nobody expects! The plumbing is quite impressive. The halon cylinders stand about 6 feet tall by about two feet in diameter, and the pipe is like 4 inches in diameter. The computer rooms (about 60 feet by 40 feet each) have 3 cylinders, and the operating theater (about half the size of a football field) has several clusters of 6 cylinders. Tim.