LPG leak part 2

izwozral

izwozral

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Just spoken to Gasit regarding the leaks I have been getting on my new Gasit system and I now feel I have the definitive answer. This is what I have been told by Nick in Technical Support, I hope it helps if others have the same problem when self fitting.

High pressure hoses.
When you put LPG in and there is a leak at the threaded connections there will be a layer of ice between the threads, leave this to defrost then re tighten the nut, if it does it again, take it off and clean the threads and tighten as tight as it will go. As he put it, swing on the spanner, you cannot strip the thread using a normal spanner.
 
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Forgive me if I don't sound convinced.

Gas is switched off on connection ? therefore the plumbing should seal. the gas in the threads is a result of the threads not doing what they should and only reason frozen gas be on threads

In addition if frozen gas is in the threads it would self heal the leak

Channa
 
Gas should never reach the threads. It is sealed by the O ring or other type of seal.
 
Just to clarify, there is a male convex to female concave conical seat so no O rings required, unlike the pigtails. Although the tech chap said not to use any form of sealant I am of half a mind to use a smear, tighten the nuts and leave to cure before filling again.
 
jeffmossy said:
Hope you get it sorted soon Ral
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Thanks Jeff, me too. Something as potentially dangerous as gas I just want it sorted 100% safe. The problem is, I know that Andrew and Charlie are both experienced with gas but what the techy guy is saying isn't gelling with what they are saying. It is a case of who do I go with, so to speak. I even read of one person who didn't want to use gas sealant because of the risk of it blocking the flow, he smacked the spanner with a hammer to fix the leak - it worked!
The tech guy assures me that the metal ends of the hoses are virtually indestructible and are put through rigorous test. They are made in Germany or was it Holland? and NOT China.
 
It is a shame, you want these things to be reliable for future use, they are brand new.

I would be inclined that if you can't easily resolve this to throw it back at them and go elsewhere.

:wave:
 
Chainsaw Charlie said:
I would be inclined to go with what he is saying as those fittings are definitely designed to self seal without any rubbers etc ,they are pretty similar to hydraulic pipe fittings on plant and they always seal , well nearly always !
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They must be similar to JIC fittings then?
 
Same type of fitting as compression central heating fittings,i had one that would not seal so i used some fine grinding paste and finished with tooth paste to lap in to form a water tight seal.
 
Chainsaw Charlie said:
We use Rocol gas sealant normally but I just looked and it isn't suitable for lpg in liquid form so not really sure what is .
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From the Internet

The ORIGINAL Non-Setting Pipe Sealant trusted by Gas Fitters. Product Overview. ROCOL®. GASSEAL is a non-setting, off white sealing compound primarily designed for Liquefied. Petroleum Gases (LPG), Natural Gas, Air & Water. Due to its non-setting nature ROCOL GASSEAL can be pressure tested immediately after ...

The LPG will not be in liquid form it will be gas ..

As you will not be undoing them once it's installed I would go with the GASSEAL and be done with it. I used it when I did mine. Checked all the joints with soapy water afterwards.

..
 
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QFour said:
From the Internet

The ORIGINAL Non-Setting Pipe Sealant trusted by Gas Fitters. Product Overview. ROCOL®. GASSEAL is a non-setting, off white sealing compound primarily designed for Liquefied. Petroleum Gases (LPG), Natural Gas, Air & Water. Due to its non-setting nature ROCOL GASSEAL can be pressure tested immediately after ...

The LPG will not be in liquid form it will be gas ..

..
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I suspect the issue is we are talking HP side of the system for LP side various sealants are available. I tend to go with Harrow they are not sealing therefore not fit for purpose and have them changed

In addition the post talks about pressure testing which suggest LP side hp side is not tested different raft of rules

Channa
 
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One of these then .. :scared:
 
I would remove the leaking joint(s), examine/clean the faces and retighten, ensuring the pipe/fitting is/are square on to each other. These type of fittings can be tightened up hard.
 
Just CHECK the actual hoses do not have a crack as you could tighten the connection until next year but a porous hose will still leak, wash it down with a washing up liquid and water mix then look for, little bubbles, little buubles, because the stenchant is really strong and penetrating. We had half the town closed down for a gas leak, just by having a SEALED 205 litre drum in the warehouse, people were smelling it all over and phoning the Gas Board.
 
Am I misunderstanding how the system works? Once the gas has been delivered into the bottles via the fill port, doesn't the high pressure hose then become dormant until refilling again? My assumption is based on one bottle closed and one bottle open feeding the cooker, fridge etc. via the pigtails. I don't have auto change over so the bottle to bottle high pressure hose doesn't come active until refilling. The non-return valves prevent back filling into the high pressure hoses from the bottles.

Does the above make sense or am I talking through my backside?
 
Morning Ral,

I'm pretty sure you will find that there is residual gas under some pressure in the HP side after filling. From schoolboy science, I don't think it will be held in the fill pipes as liquid because when you disconnect the filler hose there's a release of pressure which is vapour. This says to me that any contents in the fill hoses will be vapour and not liquid but there will be some left behind.

I've just had a battle to get the on bottle regulator to seal on mine. Best of luck.

Cheers

H
 
izwozral said:
Am I misunderstanding how the system works? Once the gas has been delivered into the bottles via the fill port, doesn't the high pressure hose then become dormant until refilling again? My assumption is based on one bottle closed and one bottle open feeding the cooker, fridge etc. via the pigtails. I don't have auto change over so the bottle to bottle high pressure hose doesn't come active until refilling. The non-return valves prevent back filling into the high pressure hoses from the bottles.

Does the above make sense or am I talking through my backside?
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You are correct this is how I have fitted mine, and I have removed them when full to change the filler from inside the locker to the skirt, and when I did I took all the pies off and because of the non return valve no gas comes out, so if you did have a leak on the pipes it would only be what is in the fill pipe that can leak out.
 
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