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Old 01-16-2020, 08:52 PM   #1
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Ambiguity Reigns

Here you go, anyone want to advise what will happen if I lifted this cover and threw the switch?
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Old 01-16-2020, 09:16 PM   #2
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I think it is intended to stop release of automatic fire suppression agent in the engine room in the event you prefer to risk fire vs. losing control of your vessel's engine while underway in a tight situation,
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Old 01-16-2020, 09:28 PM   #3
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I suspect it overrides the automatic fire shutdown, allowing you to restart the engine(s). Automatic shutdowns typically go hand in hand with an automatic fire extinguishing system in equipment space. When the fire system activates and discharges the suppressant, then engines and fans need to be shut down at the same time, otherwise they draw all the suppressant out of the equipment space rendering it useless.


But then you need to get running again, and that's where an override switch comes into play. It overrides the automatic shutdown, and you can restart.
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Old 01-16-2020, 09:34 PM   #4
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OK, so two slightly different, but important, interpretations so far!
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Old 01-16-2020, 10:10 PM   #5
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As an English major, of course that means...um...yeah, no idea. Ha!
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Old 01-16-2020, 10:24 PM   #6
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Greetings,
Mr. m. For sure, that switch either turns the extinguisher on or off and THAT'S a definite maybe.


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Old 01-16-2020, 10:52 PM   #7
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‘On’ if it fails to go off automatically.
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Old 01-16-2020, 11:13 PM   #8
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Don't touch this, please believe me don't touch this. Our future is in your hands...




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Old 01-16-2020, 11:41 PM   #9
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Just go for it. What could happen?
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Old 01-16-2020, 11:50 PM   #10
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Better than this one on my Humvee,
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Old 01-17-2020, 12:49 AM   #11
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But Where is the Ambiguity?

Courtesy of Monty Python:


https://www.quotes.net/mquote/802272
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Old 01-17-2020, 06:50 AM   #12
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Also, if you have your fire extinguisher system checked professionally on a regular (annual) basis, they would instruct you in the use of that switch!!
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Old 01-17-2020, 08:07 AM   #13
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Quote:
Originally Posted by Chrisjs View Post
Also, if you have your fire extinguisher system checked professionally on a regular (annual) basis, they would instruct you in the use of that switch!!
I have it certified at the proper certification period and it is current. But I am not at the yard when the third party does it.

So there! :P
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Old 01-17-2020, 08:13 AM   #14
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Quote:
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‘On’ if it fails to go off automatically.
I have a manual pull in a cockpit locker that I know does that. I have the above switch on both helms. Casually I had been assuming that it was an emergency activation switch if the auto failed or I saw a fire but it hasn't reached the temp lever to auto activate.

But when running home yesterday I looked at the wording and thought it didn't necessarily mean that. It could be that, or a small fire has started that we were fighting successfully with extinguishers and I didn't want it going off as there were people in the ER. I hadn't thought about the third scenario above - to re-establish systems after fire resolved!
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Old 01-17-2020, 09:23 AM   #15
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They can be hooked up several ways..maybe even company dependent.

They can either allow an engine restart after an auto shutdown, or prevent a shutdown after an audio/visual alert and impending shutdown (time delay).
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Old 01-17-2020, 09:53 AM   #16
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No clue. But it does bring up some memories...

I worked in an office with an automatic halon fire suppression system. If dust or something else set off a detector (which happened fairly regularly) we had 60 seconds to disarm it before all hell broke loose. If you've ever seen one of those go off in an office full of paperwork, you'll know what I mean.

Sometimes I'd be the only one there, working overtime or covering an off shift. To shut it off, you had to open the supervisor's desk, find the key ring, figure out which of a dozen keys was the right one, go out to the panel in the hall, open it with the key, and figure out which of the myriad buttons needed to be pressed and held for x number of seconds. All the while with alarms and flashing lights going.

Now, imagine late at night, all alone doing boring paperwork, when the alarm goes off. Talk about an adrenaline rush!
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Old 01-17-2020, 10:05 AM   #17
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I've got a similar memory.

Back in the day the machine room in the campus computing center had such a system. One night there was a nuisance alarm. The operators on duty threw the switch to prevent the system from discharging.

What they didn't know was the alarm also flashed in the campus security building. A security person jumped in his car, raced across campus, entered the computing center and must have thought "oh god, the building is on fire and the extinguishers are disabled!" Before anyone could stop him..

Recharging that system was expensive. Cleaning up all the papers and blown-out ceiling tiles was also a joy.
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Old 01-17-2020, 10:23 AM   #18
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Quote:
Originally Posted by twistedtree View Post
I suspect it overrides the automatic fire shutdown, allowing you to restart the engine(s). Automatic shutdowns typically go hand in hand with an automatic fire extinguishing system in equipment space. When the fire system activates and discharges the suppressant, then engines and fans need to be shut down at the same time, otherwise they draw all the suppressant out of the equipment space rendering it useless.


But then you need to get running again, and that's where an override switch comes into play. It overrides the automatic shutdown, and you can restart.
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Old 01-17-2020, 11:09 AM   #19
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When all else fails... Read the instructions.... Said thoughtfully tongue in cheek...
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Old 01-17-2020, 11:14 AM   #20
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When all else fails... Read the instructions.... Said thoughtfully tongue in cheek...
The boat has a full set of docs - I only have to do two things. Have the willingness to go read up on it, and find that particular doc in the files (if its there)!

Meanwhile...
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