From: Royce C Hayes (rc_hayes1@juno.com)
Date: Thu Jul 17 2003 - 17:25:54 PDT
I have been in the RV business for 23 years. My advice is to throw said
defective tank away. They can't be refilled anyway if they do not have
the new type valve assembly. New tanks run about $25 for a 20# capacity.
Used tanks are easy to come by. My propane dealer will give me the
tanks if I pay to have the new style valves installed.
What you call gas-grill cylinders can power an internal combustion
engine. Simple explanation is to "T" it into a vacuum line after passing
through a solenoid made to pass gasses. (similar to nitrous oxide). It
may have to be regulated but I do not know how much you need to flow.
Royce
========================================
On Thu, 17 Jul 2003 16:08:19 -0700 Richard <metal@fullwave.com> writes:
> Eric,
>
> Gas-grill cylinders are VAPOR-TAP...and
> the tank on a propane-vehicle is almost certainly
> LIQUID tap....with the liquid piped to a vaporizer.
>
> In other words, the gas-grill tank would probably
> not work very well.
>
> In regards to the gauge, if it's like the one on
> my tank, it's a magnetic gauge. In other words,
> the internal gauge mechanism rotates a magnet
> BELOW the seal, and that magnet actuates the
> gauge pointer ABOVE the seal.
>
> The 'innards' should be part of a screwed-in
> assembly. You should be able to simply unscrew
> it, clean the threads, apply new sealer, and re-install.
>
> I've never seen a welded-in one. In fact, I've never
> seen ANY thing welded into a propane tank except
> for female pipe-thread fittings. All valves, taps, gauges
> etc. are normally male pipe-thread. This is so that
> any of these things can be repaired or replaced without
> having to weld the tank.
>
> If you really do have a cracked weld around one of
> those fittings....hmmm....I'm not sure I'd weld it.
>
> I have confidence in my welding, but....it's just one
> of those things :)
>
> Theoretically, there's no reason you can't weld it.
> It was welded in the first place. But I dunno....
>
> But I've never seen a cracked weld on a propane
> tank. They're typically made and inspected to pretty
> high standards....and are usually stress-relieved after
> welding, or shot-peened, etc. etc..
>
> Final note: Older tanks used the old-style "pipe goo"
> on the fitting threads, and that stuff can really harden
> up solid. I've had a couple that I just could not get
> out. The pipe wrench just started destroying the
> fitting.
>
> One of these days, I'll get around to purging the tank
> with argon, and then heating the fitting with a torch.
> That almost always loosens 'em up OK. Anyway, be
> prepared for that gauge fitting to be pretty damn tight.
> Use a good wrench from the very first effort; or even
> better, a 6-point socket if you possibly can.
>
> And of course, none of the above is to be construed
> as advice or instruction! It's just my own opinion.
> Seek professional help...etc. etc..
>
> Richard
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