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Old 10-18-2016, 12:34 PM   #1
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How long will 30 gallon LPG tank last, if...?

My new Flying Cloud 25 RB is used full time. I have had it about 3 weeks. I would like to anticipate when the first of the two LPG tanks is empty and think I will switch to the second tank a bit before tank 1 is exhausted so there is no interruption of gas to furnace/stove/frig. Of course, it depends on use. I am alone in its use. I am in Washington State on an island with temps usually ranging between 45 and 55 degrees. Enjoying a cool environment, I turn the furnace on for 20 minutes in the morning, setting at 66. A small electric space heater then keeps the AS at a comfortable temperature as it gets light and some morning warming occurs. A few colder days a week, I may later in the day turn the furnace on for a half hour longer. The stove is used about twice most days. I think I should see a dial-gauge on the tank turning red, but it is still green. Assuming the dial-gauge is working, when am I likely to see red? Yes, a newbie needs any advice the question deserves. Thanks.
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Old 10-18-2016, 01:10 PM   #2
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I do not think you are going to get accurate answers to your question, unless someone lives your lifestyle in your climate. Way too much variability. Those tank mounted indicators or gauges see pressure, which is not a reliable indicator of what is in the tank. I have a Truma ultrasonic detector that you move up and down the outside of the tank and it gives a fairly accurate indication of liquid level. I'd suggest something like that if you really want to monitor your tank level.
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Old 10-18-2016, 01:13 PM   #3
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I think you would benefit some one of these if you don't want service interuption:

Cavagna (52-A-890-0006C) Auto Changeover Regulator Kit


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Old 10-18-2016, 01:20 PM   #4
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Just check the gauge every day. When it shows red, flip the lever to the other tank and go get the first tank refilled. Your usage apparently is pretty low, since you're 3 weeks and counting on the first tank.

Or go do it now and get a feel for judging the tank status by weight. Complete refill on a 20lb tank is about 4.5 gallons, so your 30lb is probably about 7. After you've done this a few times you'll be able to estimate where the tanks are accurately enough.
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Old 10-18-2016, 02:18 PM   #5
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Are you plugged into power for your space heater? If so, just use the heat pump! If not, you can set the regulators to use both tanks at the same time. The only problem is not knowing when one tank becomes exhausted.

BTW, Friday Harbor has to be one of my five most favorite places ever! You are blessed to be living there!
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Old 10-18-2016, 02:33 PM   #6
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Upgrade to a Dyson Hot Cool heater.

The rest is subject to too much variance.

Look into winter living threads for ideas on how to conserve heat.


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Old 10-18-2016, 02:35 PM   #7
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25,000 BTU Furnace - Propane Consumption

Quote:
Originally Posted by Rob Cope View Post
My new Flying Cloud 25 RB is used full time. I have had it about 3 weeks. I would like to anticipate when the first of the two LPG tanks is empty and think I will switch to the second tank a bit before tank 1 is exhausted so there is no interruption of gas to furnace/stove/frig.
Your FC should have an automatic switch over valve so that as one tank empties the valve will switch to the other tank. You can tell which tank is empty as the indicator on the valve will show red instead of green.

Your furnace uses 25,000 BTUs per hour when running. A full 30 lb tank contains about 639,000 BTUs, so your furnace would be able to run continuously for over 25 hours.

Your manual will also tell you how much propane (BTUs) the burners on the stove use.
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Old 10-18-2016, 04:34 PM   #8
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Just a quick note: Your cylinders contain 30 pounds of LP, not 30 gallons. The notion of gallon varies a lot with temperature (and is therefore an inaccurate way of filling cylinders, but still acceptable as a way to charge for propane).


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Old 10-18-2016, 05:27 PM   #9
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I have an older 25FB and have NEVER experienced a disruption in gas flow. I have an automatic change over valve and I am sure you do too. When you see the red indicator, flip the switch, turn off the valve to the empty tank and take it in to be filled. Bring the full one back, reconnect the hose and SLOWLY turn the valve back open.

Continue to monitor the gauge until it turns red again and repeat the process. There are a lot of folks out there that don't trust the engineering in the automatic switch over valve. They must monitor constantly, change before the tank is empty and take more trips than necessary. Then there are those who just wait for the tank to empty before they switch to the new tank. Now there is a disruption.

Have an electric space heater available in case of an emergency or, if you like, use that to heat the trailer.
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Old 10-18-2016, 06:33 PM   #10
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Rob:
I full time in Bellingham and from my experience over the years is.
a)your regulator will switch over to the full tank when you empty the 1st one.j
b)I found that despite testing all my propane connections that they DO leak albeit
slowly so you can save a LOT of gas by turning off the gas when not in use.
c)I use a small electric heater mostly and only use the furnace when I want to go from near freezing to 70 in 10minutes. You should not need to use anything other than the little electric heater unless we get a freeze (rare).
NOW....to answer you question: I can get a couple months out of ONE 30Lb tank by:
a)heating up the 6gal tank in the eve for a shower (military style) then there is enough hot water to do dishes in the morning. I don't just leave the hotwater system on all the time.
b)use the electric heater mostly
c)keep your tank valves OFF mostly.
One way to test the integrity of your propane connections is......Before you go to sleep shut off the gas. In the morning try to light one of the stove tops with the gas off...if it lights for a couple sec's you have a fairly tight system. Chances are that after 12 hrs it won't light...that means you have the usual barely perceptible leaks.
PS: I keep my AS in a barn so there is less heat loss due to wind and rain which will suck the heat out much faster.
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Old 10-19-2016, 02:36 PM   #11
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Two other alternatives:

1. Replace your 2 30# tanks with 2 40# tanks.
2. Buy a substantially larger tank & plumb it next to your 30# tanks.
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Old 10-19-2016, 02:41 PM   #12
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Quote:
Originally Posted by Rob Cope View Post
My new Flying Cloud 25 RB is used full time. I have had it about 3 weeks. I would like to anticipate when the first of the two LPG tanks is empty and think I will switch to the second tank a bit before tank 1 is exhausted so there is no interruption of gas to furnace/stove/frig. Of course, it depends on use. I am alone in its use. I am in Washington State on an island with temps usually ranging between 45 and 55 degrees. Enjoying a cool environment, I turn the furnace on for 20 minutes in the morning, setting at 66. A small electric space heater then keeps the AS at a comfortable temperature as it gets light and some morning warming occurs. A few colder days a week, I may later in the day turn the furnace on for a half hour longer. The stove is used about twice most days. I think I should see a dial-gauge on the tank turning red, but it is still green. Assuming the dial-gauge is working, when am I likely to see red? Yes, a newbie needs any advice the question deserves. Thanks.
My vintage rig is 50 years old and the automatic gas switchover still works but the red/green flags do not. Not having a gauge on the tanks it is easy to tell how much is in the tank by taking a quart of hot tap water and pouring it slowly down one side of a tank. Then without delay feel the tank from top to bottom. Where the feel changes from warm to cold is the level in that tank. Mark it with chalk if you wish to have an erasable record. 10 days later repeat and you should then be able to extrapolate an estimate of how long the tank will last at that use rate.
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Old 10-19-2016, 02:53 PM   #13
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You can try this to keep an eye on the levels. Supposed to work pretty well.
To many variables in consumption to really tell how long a tank will last. If you have a water heater that can also operate on electric using that and the space heater will help significantly. The rv propane appliances are very inefficient.

http://www.pplmotorhomes.com/parts/c...FYFZhgodb4YJ-Q
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Old 10-20-2016, 01:48 PM   #14
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Hi all,
I am impressed with all so much willingness to advise me. I have learned a lot from realizing it is pounds, not gallons to turning off valves when not in use....and so forth. This will be an ironic note: the very evening I posted the question, the first tank went to red, so I did the switch. Thanks all.
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