LPG filler point (3 Viewers)

[Tribbtravs]

I am a bit more confident going for the first fill now I have done that. Just worried that I could have had a massive leak when filling. The pressure in the calor bottle must have been quite high because it took me quite a few attempts at getting the temp filler pipe leak free before success.

 

[tonyidle]

I had a quick look into the possible delivery pressure of some lpg dispensers when we were discussing the need to close the outlets before filling to protect the regulator from excess pressure during the fill...
Something i usually forget in spite of advice thats its best practice to do so...
Information i managed to get from one dispenser manufacturer was that delivery pressure was commonly 100psi or 7 bar above vapour pressure...
Andy.

That's certainly possible but isn't needed other than to speed up delivery. In fact the non-return valves open and transfer of liquid in the pump hose audibly occurs before the pump starts.

 

[Rusty Pumper]

Hi Minxy Girl,

Here is a link on YouTube to a great couple in their Hymer fitting one of the smaller fittings:



Hope it's helpful.

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[tonyidle]

Not sure what my “misconception” is. If the pumped liquid pressure did not exceed the gas pressure in the cylinder then nothing would flow in that direction, at least it didn’t when I last studied physics 50 years ago. Whenever I have filled up the process has been reasonably quick suggesting a significant pressure differential between pump and cylinder, very much in keeping with @andy63 ’s 100 psi above vapour pressure.


Yes, now I think about it again I can see how the gas vapour from the cylinder would flow throughout your system and I am glad you have been able to check it out. Propane at 16*c is shown as having a 92 psi pressure so this is reasonable test. With @andy63 ’s explanation the pressure in the inlet pipe could be double this, when I first filled my system I did find I had to tighten one joint a bit more to get a good seal

I was simply pointing out that the pump has little or nothing to overcome. If the pressure at its inlet is the same as that at the outlet the pump then it shifts liquid with no necessary pressure differential. There is hose friction and lightly sprung valves in the way and a higher delivery pressure might be desirable to speed things up. But it isn't needed to shift liquid. An analogy: you might use a hand pump to shift water from one container to another. The inlet and outlet of the pump are both at 14.5psi. You don't need the pump to develop 14.5psi to push water out.

 

[Pausim]

That's certainly possible but isn't needed other than to speed up delivery. In fact the non-return valves open and transfer of liquid in the pump hose audibly occurs before the pump starts.

Why would the liquid lpg move from one tank to another if it wasn’t pumped the pressure of both vessels being the same?

 

[Pausim]

I decided to do my own research about lpg pumps and it entirely supports what @andy63 was saying. One manufacturer claimed their Autogas pumps could operate at a differential pressure of up to 175 psi. I don’t claim to understand the full technicalities of the pumping process but I think the high pressures are needed because as the lpg is transferred the pressure drops on the side the liquid is flowing from and increases on the side it is flowing to. Seems to make sense and perhaps one of the reasons for shutting off the supply to the regulator.

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[tonyidle]

Why would the liquid lpg move from one tank to another if it wasn’t pumped the pressure of both vessels being the same?

No idea - but it certainly does. I could guess that maybe temperature differential possibly or the empty space filling between pump handle valve and tank inlet non-return valve creates a surge.

 

[Basildog]

View attachment 224198 Rigged this up today to do a test for any leaks and also to see if I could use a spare bottle if I couldn't find any autogas stations. All seemed to work fine. Next step is to do a fill up for real. Actually, next step is do some weeding!!!!

Better to buy the correct hose
Gaslow also do one
https://www.gasit.co.uk/gas-reserve-hose-system-uk-21-8-lh-butane-type-nut.html

 

[Chockswahay]

I'm keeping this thread noted, gotta fir gas in a couple of weeks time

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[Neckender]

View attachment 221188 View attachment 221186 View attachment 221187 This is what you need if your fitting filler in plastic bumper.


John.

Sorry folks I made a mistake on the above post as the angled filler is for 8mm pipe, this is what’s needed
http://www.lpgshop.co.uk/w21-8-to-jic-3-4-unc-plate-lpg-filling-point-90deg/

John.

 

[Tribbtravs]

Filled up about a month ago and went away for 3 nights. All seems well and found filling easy. My only comment would be that the gauge is showing about 3/4 full and there is no way I have used that much. I cannot smell any leaks and i have a very good sense of smell. I am hoping the gauge on these cylinders are not very good. I will find out on my next fill up. If it only takes a couple of quid i know its the gauge playing up.

 

[Minxy]

The gauges aren't that accurate unfortunately. One thing to be aware of though it that not everyone can actually smell gas apparently. I can sniff even the most miniscule whiff 20 ft away, hubby would have to have his snoze stuck up the pipe to do the same!

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[Alex Black]

But you still need the screw-in bayonet which is a pain and a potential leak point.

The whole idea of the screw in brass adapters is to allow easy use of your system for the different Euro countries you visit. If you are staying UK side then just fit the flush type with the bayonet UK type filler fitted. Pull up, connect up without opening any hatches and fill up. Simple and completely safe.

You should not experience any leakage with the screw in adapters as they are very accurately CNC machined items, (Well mine are) and fitted with rubber O rings, so no leaks unless the rubber O ring is damaged. A 2 pence replacement. The adapter should take no more than around 5 -10 seconds to fit & they require only hand tightening enough to compress the O ring.

In over 4 years now I have not experienced any leakage OR required to change an O ring, which I Inspect and check every time I use one of my adapters to fill up. A very simple and effective system which we have used European wide completely trouble free.