Good Sam Club Open Roads Forum: Tech Issues: Propane leaks during storage.
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 > Propane leaks during storage.

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opnspaces

San Diego Ca

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Posted: 03/12/20 09:52am Link  |  Quote  |  Print  |  Notify Moderator

Is it normal to have to bleed air from the system when you get your rig out of storage? I do shut the propane off when I drop the trailer off for storage. And I always considered it normal to have to bleed the air out to get ready for a trip. But lately I've been wondering if this is normal, or if I have a leak. So I figured I would see what your experiences are.

Do you (you personally not you hypothetically) have to bleed air out of your system if you shut the propane off for an extended period of time?

Oh as far as normal. I realize that by design there should be no leaks during storage unless you open the system somehow. But with how cheaply these components are made I would consider it normal if the majority of you also have to bleed the air out every time.


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ScottG

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Posted: 03/12/20 09:57am Link  |  Quote  |  Print  |  Notify Moderator

Yes, absolutely normal.


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BFL13

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Posted: 03/12/20 09:59am Link  |  Quote  |  Print  |  Notify Moderator

How long a time is "extended"? All winter or between trips because there is no parking at home?

Maybe not the same as with bottles, but if the big tank in our Class C is turned off for a few days, and then opened, it takes a couple of tries to get the furnace to light, but the stove lights up ok.


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Posted: 03/12/20 10:10am Link  |  Quote  |  Print  |  Notify Moderator

I need to bleed most of the time...twenty seconds or less at the stove and then the fridge lights very quickly.


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Posted: 03/12/20 10:36am Link  |  Quote  |  Print  |  Notify Moderator

Normal.... been doing that for MANY years.... I used to start with the high output burner first, when I had 1. .


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opnspaces

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Posted: 03/12/20 10:46am Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

How long a time is "extended"? All winter or between trips because there is no parking at home?

Maybe not the same as with bottles, but if the big tank in our Class C is turned off for a few days, and then opened, it takes a couple of tries to get the furnace to light, but the stove lights up ok.


That's a good question about the length of time in storage. I don't think I've noticed an issue with a week between uses. But the majority of my storage is a month or more between trips.

Old-Biscuit

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Posted: 03/12/20 10:59am Link  |  Quote  |  Print  |  Notify Moderator

Normal to have to 'bleed' propane system after non-usage

BUT you are NOT bleeding AIR out of the system.
When all propane appliances are tuned off the LP Reg goes into 'lock-up' mode to prevent HIGH System pressure (static)

Then when placing system back in service the REG needs to come out of 'lock-up' status and establish flow----need a demand to do so.
At 11"WC (0.4psi) establishing that FLOW thru out the system can take several minutes and lines to each appliance will need to have flow fully established by those individual appliance gas valves opening.
Some will require several attempts due to appliance gas control/flame sensing.

Stove top is easy due to NO flame sensing ----turn knob, spark/match and light the flame.
That first demand palces REG in service and starts establishing flow

Propane has a narrow ignition window and until proper flow is established the air/fuel mixture will be unbalanced so it may seem like 'air' is coming out but it really is propane at low pressure which needs to come to full sstem pressure so that the correct air can be pulled in thru appliance burner 'air' inlets to mix with the propane at full pressure for correct combustion ratio

NO AIR.....just low propane flow/pressure

Absolutley NORMAL


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Posted: 03/12/20 11:25am Link  |  Quote  |  Print  |  Notify Moderator

Thank you Old Biscuit. Finally an explaination that is difinitive and actually makes sense. I have questioned the "bleeding the air out of the lines" reply for years but did not know about the regulator having to adjust itself after coming out of closure.

opnspaces

San Diego Ca

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Posted: 03/12/20 11:31am Link  |  Quote  |  Print  |  Notify Moderator

^ Old-Biscuit: This is purely an academic question as the real question was is it normal. But I am interested in this aspect as well so thanks for bringing it up.

I mostly follow, but does the odorant dissipate or maybe settle over time? I ask because out of curiosity I have more than once stuck my nose down by the stove burner and taken a big whiff when I first turn the system on. I usually get a faint propane smell which is why I figured it was air.

Has anybody else taken a whiff or am I just kind of "different" in that aspect? [emoticon]

dougrainer

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Posted: 03/12/20 01:50pm Link  |  Quote  |  Print  |  Notify Moderator

The VERY SMALL (microscopic) possible leak in the rubber parts of the closed LP system WILL leak out over time. BUT, while the LP has leaked out, there is no way for AIR to then migrate IN. It took pressure to force the LP thru the microscopic voids in the seals. So, when you find the LP has dissipated from storage, when you open the tank valve, all you are doing is filling the lines with LP vapor and basically going down an empty pipe. Doug

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