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Old 12-27-2015, 04:10 AM   #1
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Swapping 30# LP Tank for 40#

I noticed a lot of pigtails for the LP tanks identify specifically ratings for up to 30#. Is there any concern or issue with swapping my existing 30# tanks for 40#s?

I have an Onan 5500 LP Generator on my new Carriage 5th wheel and am not familiar with the LP Generators. Compared to my old 5th wheel Onan gas generator, the gas sure lasted longer.
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Old 12-27-2015, 06:05 AM   #2
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The ratings for any pigtails and hoses should be for pressure (30psi for example), not the weight of the propane in the tank they're attached to. As long as the threads are right, you have enough room and you can lift the 40# tank into place, there should be no problem swapping tanks.

That being said, the pressure inside the tank could be up to a couple hundred psi, and the pressure to your appliances (after the regulator) will be in the range of 11" of water column (.4psi). Any hose with POL threads or the like to attach directly to the tank should be rated for high pressure. Most RVs are equipped with 2-stage regulators to get the pressure down to 11" WC. There are regulators available for intermediate pressures like 20 or 30psi.
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Old 12-27-2015, 05:47 PM   #3
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I did this for my trailer, just make sure you have enough room for the additional height and I did have to buy a longer piece of all thread for the hold down clamp, I believe that mine was 1/2" x 18 and cut to size.
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Old 01-01-2016, 10:16 AM   #4
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Older I get I want to trade 40's for 30's. Those tanks get heavier every year.
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Old 02-07-2016, 10:36 PM   #5
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I replaced my 30# with a 40# and enjoy the extra capacity. No issues other than the additional weight (about 17#) that is okay for now. really helps with the cold weather areas I often visit.
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Old 02-08-2016, 05:23 PM   #6
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This too shall pass. lol
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