Propane Locker

Sparkle Plenty - 1980 Mariner 36 (New Hampshire)

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Port Lights Bottom Electrical System Propane Locker Repower Main Traveler

During the of winter of 2003-2004, I installed a propane locker. I had given the location a lot of thought considering putting it under the port cockpit seat towards the helm. But this would limit access to the steering system.

Completed Propane LockerSP was originally equipped with CNG. A previous owner had converted to propane and mounted two tanks on the stern rail for extensive cruising in the Bahamas. When I purchased the vessel, this system was in need of refurbishing, so I decided to remove it from the stern rail and look for an internal location. Finally, I decided on the small port cockpit locker next to the companionway.  (Click photos for a larger view.) The locker was being used for odds and ends storage. Originally, it had been a pass-through to the ice-box for lowering ice blocks. A previous owner had added Adler-Barbour refrigeration and had blocked off the access to reduce the size of the ice-box. He then installed a false bottom and grate about 10 inches deep in the cockpit locker.

Pass-thru compartment to ice-box.At a used chandlery, I located a fiberglass propane locker designed to mount under a deck. The dimensions fit the small cockpit locker perfectly once it's flange was trimmed to the width of the locker.  I began by removing the locker's false bottom to reveal a deep vertical space filled with chunks of hard foam insulation. I removed the insulation and added a thru-hull for the propane locker vent.

Completed propane locker detail

I assembled the new plumbing items to fit against the locker's side leaving clearance for the 5 lb tank which came with the locker. These included a new regulator, pressure valve, solenoid, and gas connecting hose. After assembly, I soap tested all the fittings for leaks.



Trident Gas Control Panel and Blue Sea Battery Combo SwitchThe solenoid came as part of a package with a new Trident Gas Control Panel which also included an integrated alarm and sniffer unit. This replaced an older Marinetics control panel that lacked the alarm feature. I mounted the new unit in the bulkhead over the icebox in the same cut-out as the older panel.

I mounted the  sniffer behind the galley stove. If it detects fumes, the sniffer sounds an audio alarm through its built-in speaker. Simultaneously,  it trips the breaker in the Trident panel, turning on a red alarm light and shutting off the gas switch. Instructions call for the sniffer to be hot wired so that it is always on. I had problems with this setup. First, the unit appeared to get abnormally hot to the touch. Second, even though I had soap-tested the propane system and had a well sealed locker with external drain, the sniffer would go off, usually after running the diesel. Sniffer Unit mounted behind stove.Because the alarm was hot wired, there was no way to shut it off except to turn off the house batteries, shutting down the frig and electronics. The last time the sniffer went off, I covered my ears and let it buzz to see if it would eventually clear itself. Well, it didn't and eventually it actually began to smoke! It was evident that this unit was defective and was itself a hazard. After a call to Trident, the tech support rep agreed. He also said it would be acceptable to wire the sniffer into my DC panel so I had a way to turn it on and off. Trident replaced the burned up sniffer with a new unit under warrantee. Now, I only turn the sniffer on when I'm cooking or when I'm sleeping aboard. This also serves as system check. When I power the sniffer on, its alarm sounds for 5 to 10 seconds then it trips the gas control panel breaker, so I know the sniffer is working properly. (I haven't had any false alarms, even when I've left the new sniffer on for extended periods.)

After my sniffer switch modification, the new propane system works quite well. With the propane locker opening to the sky, the Trident Gas Control Panel and the on-board sniffer, I believe I've met all the safety requirements.

Scrambled eggs--first meal with the new propane system. 

The skipper cleans up in the galley.

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