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Old 06-17-2020, 05:28 PM   #1
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Question Propane pressure drop

Experience request for propane plumbing.....!

Our 2007 Cougar 276RLS is experiencing a large propane pressure drop at all appliances under high demand (of the furnace). Furnace has been checked out at a good rv repair business, regulator has been replaced, lines are free of kinks. There are no noticable leaks in the system. Static pressure is around 15Ē, but drops to 2-4 on demand.

Next thought is that debris has gathered in steel or copper supply lines. Any experience out there on blowing the supply lines out and accessible screen locations, if any.

Maybe disconnect distribution at regulator outlet and connect compressor at stove supply, then blow out at 30-40 psi....?

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Old 06-17-2020, 05:54 PM   #2
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Since that's a closed system: I don't think that debris in the lines is your problem.
(This is a stoooopid question... but I have to ask... )

Have you checked for leaks at all of the connections?
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Old 06-17-2020, 07:24 PM   #3
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Originally Posted by PeterW View Post
Experience request for propane plumbing.....!

Our 2007 Cougar 276RLS is experiencing a large propane pressure drop at all appliances under high demand (of the furnace). Furnace has been checked out at a good rv repair business, regulator has been replaced, lines are free of kinks. There are no noticable leaks in the system. Static pressure is around 15Ē, but drops to 2-4 on demand.

Next thought is that debris has gathered in steel or copper supply lines. Any experience out there on blowing the supply lines out and accessible screen locations, if any.

Maybe disconnect distribution at regulator outlet and connect compressor at stove supply, then blow out at 30-40 psi....?
I would replace the single stage pressure regulator with a two stage and make sure the excessive-flow valve is reset and not sticking (if you have one). If you drive with the propane off and then suddenly open the tank valve, that can cause the excessive-flow valve to limit flow. To clear, turn the tank valve off. Bleed the propane system down. Next just crack the valve open and let it sit slightly open for an minute slowly pressuring the propane system. If you listen carefully you can hear a slight click when opening the valve and another as the system pressurizes. The first click it the valve closing limiting flow. The second click is the valve opening fully.
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Old 06-18-2020, 12:58 AM   #4
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No leaks in the system. Lines are still charged hours after last use.

No excess flow valve in the system. When appliances turn off, system comes right back to 15 lb
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Old 06-21-2020, 03:51 AM   #5
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.....I mean 15 inches! New regulator is two stage.
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Old 06-21-2020, 05:36 AM   #6
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No leaks in the system. Lines are still charged hours after last use.

No excess flow valve in the system. When appliances turn off, system comes right back to 15 lb
Yes there is an excess flow valve built into every propane bottle, it's a safety feature to shut flow off in the event of an accident where the lines are damaged.
As mentioned open the valve slowly.
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