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Old 07-23-2019, 09:00 PM   #1
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halon system

I am trying to decide what to do with an existing halon fire system in the engine room. the gauge say its empty. Any thoughts ?
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Old 07-23-2019, 10:10 PM   #2
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I am trying to decide what to do with an existing halon fire system in the engine room. the gauge say its empty. Any thoughts ?
Bud
Find a local company/tech that can evaluate the system and hopefully get it back in operation condition. You will find out if it just need serviced and refilled or if there are bigger issues and can then decide where to go with it.
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Old 07-23-2019, 11:16 PM   #3
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Is Halon still allowed in US, banned here.
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Old 07-23-2019, 11:44 PM   #4
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As far as I know halon was outlawed years ago.
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Old 07-24-2019, 12:31 AM   #5
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Halon is not legal to manufacture anymore in the US, but is still legal to have and use. You can buy halon fire extinguishers easily enough. Not sure about automatic fire systems with the same gas. I actually thought he was just referring to an auto fire system and didn’t take the “halon” literally. Either way, I would check with a fire systems company to find out what is there and if it is still useful.
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Old 07-24-2019, 01:12 AM   #6
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It may very well be halon. If it is and it is empty then there isnt any refilling of halon anymore and you will have to buy an new system. Did you weigh the halon bottle? That is the way to verify if it is full or not.
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Old 07-24-2019, 05:10 AM   #7
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Yes it is Halon. It does not look like an easy task to remove bottle. Looks like any halon left could leak out. Probably a shut off on bottle that I am not seeing. Any alternatives to halon thats engine freindly?
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Old 07-24-2019, 05:15 AM   #8
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" Any alternatives to halon thats engine freindly?"


CO-2, but the bottles are heavy.
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Old 07-24-2019, 05:33 AM   #9
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I don't think the extra weight will be an issue. I am concerned that it is an old system and if it was to go off by mistake while engines and generator are running I do not want to damage them. 2- 3208's and a lugger 16 kw. The system is plumbed with what looks like a melt away over each engine and generator.
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Old 07-25-2019, 05:51 AM   #10
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"if it was to go off by mistake while engines and generator are running I do not want to damage them."

No harm, tho the engines will probably stop.

Restart as soon as the Halon is gone , no big deal.

DRY powder units is a big deal and an expensive clean up.
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Old 07-25-2019, 06:06 AM   #11
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Water mist. Why not? If it works. Easy cleanup. Boat sits in water, but likely would use fresh water tank on the boat.
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Old 07-25-2019, 07:32 AM   #12
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Keep the Halon if you can. Contact a local fire extinguisher company (maybe 2 if you don’t get the answer that you want from the 1st) They will inspect and advise.
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Old 07-25-2019, 09:16 AM   #13
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Yes it is Halon. It does not look like an easy task to remove bottle. Looks like any halon left could leak out. Probably a shut off on bottle that I am not seeing. Any alternatives to halon thats engine freindly?
Bud
You should be able to reuse much of the system and refill the system with heptafluoropropane or FM200 since they are both similar gasses and FM200 is legal and "safe" as well as effective on fires. You won't suffocate like halon, but you should get out of the ER as quick as possible if it goes off.

Co2 has problems since it tends to freeze up around valves and emitters which can limit the effectiveness if either one seals itself shut.
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Old 07-25-2019, 03:25 PM   #14
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Water mist fire systems are where the technology is now in the big ship engine rooms. Forget about Halon, you cant buy any, and if you could, the price would be very high. The mist knocks down the fire and then you can hit it with a handheld extinguisher if needed.
I suppose this system is way beyond most of you.



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Old 07-25-2019, 03:32 PM   #15
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Give Fire Equipment Services in Key West a call. They service boat systems. Did a great job for some friends of ours a few years back. (772) 461-6845
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Old 07-25-2019, 05:45 PM   #16
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Old 07-25-2019, 07:21 PM   #17
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Originally Posted by Comodave View Post
It may very well be halon. If it is and it is empty then there isnt any refilling of halon anymore and you will have to buy an new system. Did you weigh the halon bottle? That is the way to verify if it is full or not.
That is simply not true. You can recharge existing Halon systems. You just can't buy new ones.
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Old 07-25-2019, 07:48 PM   #18
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My 2001 Great Harbour 37 has twin Yanmar 4JH3E 56hp diesels, kept company by a 8kW Northern Lights Gen that has a Luger Ė Shibaura 13h Diesel Engine at its core. When new, a Fireboy engine room extinguishing system was an option on GH37ís. The Fireboy can be triggered by high ER temp or pulling an activation trigger in the pilothouse. My (1y new to me) boat has this option, but the tank is expired and I was told cannot be further recertified. So it sits, charge and (probably) ready.

My understand is that diesel, as opposed to gasoline, does not pose significant shipboard fire risk. Diesel does not have a low flash point in fumes or liquid form; gasoline is very risky in these concerns. Correct?

So, do we need a robust, automatic engine room fire extinguisher system in a diesel trawler?

Early in my ownership I replaced the 5 hand-held fire extinguishers and replaced the CO detector. My boat did not have any fire/smoke detectors! I installed Home Depot 10y battery smoke detectors in the pilot house and passageway between galley and stateroom. I have not installed one Engine Room! My reasoning is if it went off, I am not sure what I would do. Would I open the large saloon floor hatch to the engine room to see why the alarm is going off, and in the process flood the engine room with fresh air to fuel a fire? I donít have a good answer. My plan is to install an inexpensive outdoor infrared video camera in the engine room, to be viewed from my tablet in the pilot house. When that is operational, then I will install a smoke detector.

I searched some other threads. How do others deal with this?
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Old 07-25-2019, 08:10 PM   #19
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Halon.... if you have it and it passes inspection, keep it.

It's intent is to shut down the engines and smother the engines. Some folks do not have it connected to the generator engine, why? I dont know or understand their decision.
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Old 07-26-2019, 06:54 AM   #20
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So, do we need a robust, automatic engine room fire extinguisher system in a diesel trawler?
Yes, you should, 1) diesel is not totally inflammable 2) you have a variety of electrical connections and devices in an engine room to get it all started.
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