Date: Tue, 31 Jul 2007 14:09:14 -0700
Reply-To: Mark Drillock <mdrillock@COX.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Mark Drillock <mdrillock@COX.NET>
Subject: Re: LP regulator tester. PIC + Question
In-Reply-To: <c4e7c5f90707311354icf31d2aiecefb74d04a1aa67@mail.gmail.com>
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You need an open bleed hole between the reg and the water while
measuring the levels. The propane must flow out of the regulator, not
just sit there. When the valve is turned off, the levels must
immediately return to even or the bleed is not working.
The point of the bleed is 2 things. One, the regulator has to be able
keep the pressure right while also supplying all the gas that the
appliances can consume so the bleed is a pseudo appliance draw. Two, the
regulator may allow the pressure to overshoot slightly in the tubing
when the gas is first turned on, so the bleed lets things stabilize.
Mark
neil N wrote:
> thanks guys.
>
> Strange it seems it may not matter how much water is in tube.
>
> True?
>
> I imagine a LONG column of water would change the readings. Dunno.....
>
> Anyway.....
>
> FWIW, (for newbies like me) I made the manometer with 1/2" clear hose.
> This fit over 1/2" copper pipe, but I heated the clear tube a *little*
> with a flame first. Tight fit, but it works. 5/8 ID hose would fit
> better. Use hose clamps.
>
> Make sure you use flared fittings. These are standard and I found the
> brass fitting in the Canadian Tire plumbing section.
>
> " 3/8" x 1/2" union" : plumbing
>
> Copper fitting in pic accepts standard 1/2" copper. (i.e. for fitting
> 1/2" copper pipe to male threads of water tank)
>
> I used a little nylon tape over threads of brass piece. One could
> solder the copper and brass pieces together if desired.
>
> Cheers,
>
> Neil.
>
>
> --
> Neil Nicholson. 1981 Air Cooled Westfalia.
>
> http://web.mac.com/tubaneil
>
>
> On 7/31/07, Mike Rocket J Squirrel Elliott <camping.elliott@gmail.com> wrote:
>
>>Well, I'm no expert but that appears to be your basic highly-accurate
>>home-made manometer. When pressure is applied to one side, it goes down
>>while the other side goes up. As I understand it, you take the distance
>>the one went down and add it to the distance the other went up to get
>>the fluid height. So 5 inches + 5 inches = 10 inches . . .
>>
>>Mike "Rocket J Squirrel" Elliott
>>71 Type 2: the Wonderbus
>>84 Westfalia: Mellow Yellow ("The Electrical Banana")
>>74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
>>KG6RCR
>>
>>On 7/31/2007 12:25 PM neil N wrote:
>>
>>
>>>Hi all.
>>>
>>>Here's the pic:
>>>
>>>http://web.mac.com/tubaneil/iWeb/Site%205/WaterColumn.html
>>>
>>>question:
>>>
>>>if water goes up LH side of hose app 5" , then double that = the total
>>>output of a given pressure regulator?
>>>
>>>I thought the LH side would go up 11" or so, but it only moved 5-6".
>>>
>>>FWIW, I bled the line near the connection (via vent hole on hose) til
>>>I smelled LP.
>>>
>>>Any answers and/or critiques regarding my test method/tester are welcome!
>>>
>>>Neil.
>>>
>>>--
>>>Neil Nicholson. 1981 Air Cooled Westfalia.
>>>
>>>http://web.mac.com/tubaneil
>>>
>>
>
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