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Old 05-16-2015, 06:30 AM   #1
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Question Propane Tank Warming Up

Hi all. We had our first camping trip this season with our 2015 Greyhawk. We drove for about an hour on the highway to the campground and when I turned on the 50lbs. onboard propane tank the level indicator was slightly in the red and the tank was warm to the touch. The tank was just under full when we left and cool to the touch. We have always had trailers before and never had this issue. This is our first MH. Is this normal?. Thanks in advance for any help or advice.
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Old 05-16-2015, 06:44 AM   #2
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Any chance your exhaust system,especially the catalytic converter, runs close to the tank? The metal propane tank could be conducting heat from that source.
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Old 05-16-2015, 08:30 AM   #3
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Thanks for the reply dougfir1. There is about a foot and half distance as well as a metal deflection shield between the catalytic converter and the propane tank. I can see no heat generating source around the tank.
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Old 05-16-2015, 09:39 AM   #4
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Quote:
Originally Posted by MFalcon View Post
snip... There is about a foot and half distance as well as a metal deflection shield between the catalytic converter and the propane tank. I can see no heat generating source around the tank.
Exhaust catalytic converters get VERY hot. That is why they often have some sort of heat shield. That is probably the source of your heat.

Here in AZ we have road side fires started by catalytic converters when folks pull off the road and park in dry grasses.
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Old 05-16-2015, 10:16 AM   #5
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Thanks oldmanAZ. Do you or anyone else have a problem with the propane tank getting warm when they drive?
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Old 05-16-2015, 12:48 PM   #6
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My guess is the pressure looked high because the tank was warmer than when it was filled, but no idea why the tank would be warmer than anything else in your storage compartments, unless that heat was from an outside source like mentioned, an exhaust or catalytic converter. But I would run something propane and use it until it was a least out of the red.
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Old 05-16-2015, 02:00 PM   #7
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Originally Posted by MFalcon View Post
Thanks oldmanAZ. Do you or anyone else have a problem with the propane tank getting warm when they drive?
I have a TT, so no.

From your earlier post, '... onboard propane tank the level indicator was slightly in the red...' That means the propane level in the tank is getting low, correct?
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Old 05-17-2015, 06:13 AM   #8
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Actually, the tank was full. This was our first trip out with it in the warmer weather this year. We bought our rig last fall and only had one trip with it, with no issues. But on our first trip out this year, the indicator showed passed the full mark at the top, into the red area. I just wanted to know if anyone else had the issue with their onboard tank. Thanks everyone for your replies so far and any further info you can provide.
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Old 05-17-2015, 07:56 AM   #9
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A propane tank is filled to only 80% capacity to allow room for gas expansion. If warmer temps push the volume into the 20% cushion, it is okay as that is its purpose.

From a propane blog:
Quote:
The 80-percent fill is a preventative safety measure against the fluctuations that happen inside a tank. Propane, like other gases, expands when itís hot and contracts when itís cool. That means a tank that is 80-percent full on a mild March day, might register as 85-percent (or higher) at the mid-July barbecue. Itís the same amount of propane, but itís taking up more space. So the extra headroom is a cushion against the pressure that builds up in a tank when itís hot out.
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Old 05-17-2015, 08:42 AM   #10
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Thanks NCRoamer. I understand the expansion and contraction properties of propane and other gasses, but the information is always welcomed. I guess I just wanted to ask if anyone else's tank warms up when they drive. Thanks again.
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