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  Topic Review (Newest First)
11-23-2015 01:17 PM
IStream
Re: LPG plumbing - teflon tape?

You don't want an airtight locker, you want it to drain overboard. Alll other potential gas egress routes need to be sealed but there must be a drain.
11-23-2015 10:31 AM
misfits
Re: LPG plumbing - teflon tape?

Quote:
Originally Posted by mitiempo View Post
You do not tape or pipe dope either connection of a flare fitting, only NPT and NPS threads.

As far as I know yellow teflon tape is a standard in both Canada and the US. It is pretty commonly available. Here if a surveyor sees white teflon tape on either propane or engine fuel fittings it is flagged.
I think we're saying the same just in different ways Brian. When I say male end, it's the npt side of the fitting. I also now understand why the reference to "yellow" tape after vising Oatey's web site. Evidently they make tape products geared for specific applications.
If one was to use an Oatey tape for "gas", the yellow tape would be the proper product to use.

Although now sold by Oatey, the Hercules brand is what's sold in the plumbing wholesale houses in my part of the world & is used by tradesman on everything including gas because it's for universal applications. That's why I had a what in the world are these guys talking about moment when the "yellow" tape was brought up.

That's all.
11-22-2015 11:27 PM
mitiempo
Re: LPG plumbing - teflon tape?

The only thing I will add is to replace the line from the locker to the stove with a propane approved flex hose with the only connections being at the stove and in the locker.
11-22-2015 11:14 PM
ScallywagSailor
Re: LPG plumbing - teflon tape?

Thanks so much everyone for the advice! It is hugely appreciated. Your shared knowledge has very effectively prevented us from blowing ourselves up, which is really the best thing Sailnet can do, right?

We have confirmed that the stove has a 3/8" flared connection, so we are going to remove the Life Caulk altogether, clean the threads and reattach confirming that it is connected with a 10mm forged flared hose to the main propane line (we have a gimbaled stove, hence the hose).

We are planning to clean the threads using a wire brush and solvent then wash with soap and water before reattaching. Anything we should specifically watch out for there?

At the point of the Propane locker, we are replacing old equipment with the following in order from the tank:

1) Trident Marine 1200-1411 Kit Assembly: Includes POL Tank Fitting to a 300 PSI Gauge to a L.P. Gas Regulator (Comes fully assembled and leak tested)

2) Trident Marine 1300-7761-Kit 12VDC L.P. Gas Control & Detection System Kit: 3/8" Solenoid to be installed after the regulator with an on/off switch in the galley along with vapor detectors near the locker and under the stove.

The Solenoid is for sure 3/8" FPT ports and not flared, so we are planning (based on this discussion) to connect those using Yellow PTFE Teflon Tape.

We will inspect the locker for air tightness, as well as any connections using a soapy water spray bottle.

What do you all think? Thanks again, for all your help.
11-22-2015 10:26 PM
capta
Re: LPG plumbing - teflon tape?

For fuel line fittings I've always used Indian Head shellac (for gas, but works great on diesel, too) on the threads and I have NEVER had a leak (air or fuel). It does not hinder disassembly and can be cleaned up with a bit of wire brushing for reassembly.
11-22-2015 09:46 PM
hellosailor
Re: LPG plumbing - teflon tape?

These are supposed to be the US ANSI standards for Teflon tapes:

White tape is single density and intended for water pipes of 3/8 of an inch or less. It can sometimes be found in a silver color to match the pipes.

Red tape is triple density, for pipes one-half inch to 2 inches in diameter. It is designed for pipes with larger joints, such as water distribution pipes. Note that the container is red, but the tape itself looks pink.

Yellow tape is double density, and designed for gas and fuel lines.

Green tape is grease and oil free, and designed for pipes carrying oxygen.

Note that they refer to the tape, not the spool, being colored. And colored tapes are actually available out there.

Would two layers of "single weight" white tape perform the same as one layer of yellow tape? Probably. But code is code, and tape is cheap in the long run.

Oatey 31403 Yellow GAS/TFE Tape, Dispenser Pack, 1/2-Inch x 260-Inch
by Oatey $5.25 Amazon Prime

Five dollars for a lifetime supply of the right stuff expressed from what isn't the cheapest source. Versus, fifty grand for a boat? And a much stiffer price in the burn ward?

But if you really wanted secure connections, wouldn't you want to overseal all of them with a nice heavy epoxy permanent seal as well? (WEG)
11-22-2015 07:38 PM
mitiempo
Re: LPG plumbing - teflon tape?

Quote:
Originally Posted by Capt Len View Post
Seems there's two ways to wrap the tape. I wrap clockwise looking at the end of the male fitting .the tape doesn't bunch up as it meets the female thread.
That's correct Len. The other way it tries to unwrap as you thread it in.
11-22-2015 07:34 PM
Capt Len
Re: LPG plumbing - teflon tape?

Seems there's two ways to wrap the tape. I wrap clockwise looking at the end of the male fitting .the tape doesn't bunch up as it meets the female thread. Either agree or tell me I'm wrong. A learning situation.
11-22-2015 06:38 PM
mitiempo
Re: LPG plumbing - teflon tape?

Quote:
Originally Posted by misfits View Post
I never said to use pipe dope or Teflon tape on a flare fitting. As others have mentioned, you do not pipe dope flare fittings, only the male threaded end. If you look at a gas fired appliance in you home there's a drip tee at the appliance connection. That's where all the impurities, dirt/condensation go rather than being delivered into the gas train. That's why I would discourage the use of tape on a boat, there's no drip tee at any of the appliance connections.

I've never seen or come across yellow spooled Teflon tape. When Mitiempo first brought that up I just figured it was a Canadian Standard. Maybe there's another standard out there that does recommend it but I'm not aware of it.

Compatibility, that's true of any pipe fitting project. The pipe, fittings, sealing compound, etc. needs to be compatible with the fluid or gas that's being conveyed. One thing we can all agree on, Life Caulk is not a suitable pipe sealing compound
You do not tape or pipe dope either connection of a flare fitting, only NPT and NPS threads.

As far as I know yellow teflon tape is a standard in both Canada and the US. It is pretty commonly available. Here if a surveyor sees white teflon tape on either propane or engine fuel fittings it is flagged.



11-22-2015 06:26 PM
misfits
Re: LPG plumbing - teflon tape?

I never said to use pipe dope or Teflon tape on a flare fitting. As others have mentioned, you do not pipe dope flare fittings, only the male threaded end. If you look at a gas fired appliance in you home there's a drip tee at the appliance connection. That's where all the impurities, dirt/condensation go rather than being delivered into the gas train. That's why I would discourage the use of tape on a boat, there's no drip tee at any of the appliance connections.

I've never seen or come across yellow spooled Teflon tape. When Mitiempo first brought that up I just figured it was a Canadian Standard. Maybe there's another standard out there that does recommend it but I'm not aware of it.

Compatibility, that's true of any pipe fitting project. The pipe, fittings, sealing compound, etc. needs to be compatible with the fluid or gas that's being conveyed. One thing we can all agree on, Life Caulk is not a suitable pipe sealing compound
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