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Old 05-14-2019, 03:10 PM   #11
notanlines
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Propane weighs 4.2 pounds per gallon. If any of y'all had 20# tanks refilled and they ACTUALLY pumped 4.8 gallons then you reached 20 pounds by any calculations. I'm just sayin'....
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Old 05-14-2019, 03:49 PM   #12
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Just did a quick search on OPD valves and found they are specific to tank size and the OPD valve number is stamped on the tank. (very highly regulated) If a refiller is only providing 15 lbs I would think it is a scale shutoff and not the OPD valve stopping the flow.

I learned something today, my local refiller stopped using the scale and the meter stopped at the appropriate number. Now I know why. I always take in empty tanks.
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Old 05-14-2019, 05:18 PM   #13
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Quote:
Originally Posted by Fast_frank_d View Post
I wonder what the deal was with my Rhino tank that my Tractor Supply could not get any more into it? Now I am very confused about that.

Just for excrutiating clarification, are you saying you bought a 20 lb tank at Tractor Supply and then had it filled at Tractor Supply and got 4.8 gal (20lb)? The reason I'm asking is that I have this irrational fear that if I buy a new tank, the OPD will still shut the valve at 15lb.
Your tank may have some residual water in it or a buildup of Mercaptin from extended use. If it's an "exchange tank from Blue Rhino" the previous "renter of the tank" may have filled the empty tank with "heaven knows what" before turning it in. I'd guess that the "fill station" doesn't purge every tank prior to filling, which is probably another reason why they only fill it with 15 pounds of LPG. That way, they aren't overfilling tanks on their automated fill line.

If there's a half gallon of water in the tank, if it's never been purged and if TSC tries to put LPG in the "empty, but partially filled with water" tank, well, they won't be able to get the full amount of LPG per the tare weight.

You might want to weigh the "empty tank" and see if the weight matches the weight stamped on the tank flange. My guess is it's off a couple pounds.

Propane tanks "should be" purged when put into service and at each certification. My guess is your tank needs to be purged so you can start with a 'truly empty tank".
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Old 05-14-2019, 05:58 PM   #14
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Originally Posted by Frank G View Post
Just did a quick search on OPD valves and found they are specific to tank size and the OPD valve number is stamped on the tank. (very highly regulated) If a refiller is only providing 15 lbs I would think it is a scale shutoff and not the OPD valve stopping the flow.

I learned something today, my local refiller stopped using the scale and the meter stopped at the appropriate number. Now I know why. I always take in empty tanks.
I'm learning too. I always thought it was a back pressure shut off when the OPD valve closed, I did not realize about the scale shut off. I'm going to try another refiller with a fresh rhino tank and see what happens.
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Old 05-14-2019, 07:02 PM   #15
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I've read this thread and think it's interesting - how much is in a tank; how much goes in the tank; how full do they fill the tank; are Rhino tank replacements less??

Not to be callous but, why do we care? I run out of propane, I go to abc dealer and pay whatever it costs to fill it.... Am I going to dispute it? Ask for a "gallon" price when they have none? Drive down the road for 30 miles to save $1 or 2?

I do think that knowing "gallons" in the tank, "weight" for the tank is very beneficial and something everyone with an RV should know. When you have a "blank" tank of ? gal/weight size it's probably good to know what it "should be" but to fret over, what, $2 max in what goes in the tank? I guess I'm lost on that - and I travel all the time. I know lots of folks fret over lots of things, but for me and LP....I'm out, fill it, thank you. I spend thousands of dollars on vehicle fuel; I need fuel now, you're here, it costs x.....I don't care.

When I was a young boy my dad was anal about finding the "best" gas price. The Cosden station on the route to the next town (with the little balls floating in the top of the pump)_ sold gas for .19 a gallon. He based that for his purchases. We would drive miles, run out of gas, push the car so we could buy gas at the "cheapest" place. They even had places in the "line" where they would go out and fill up with "drip" gas. Done. Not for me.

We have reached a point with fuel prices; diesel (which used to be cheap), gasoline or "whatever" are at what used to be unbelievable prices; propane, in a small tank, 15lb./20lb/30lb., and I pay a buck or 2 more. Sorry guys, I don't care nor will I spend zero time to try to run down a cheap place, at the cost of $5-10 to save $2. As always JMO/YMMV
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Old 05-14-2019, 08:00 PM   #16
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Originally Posted by sourdough View Post
I've read this thread and think it's interesting - how much is in a tank; how much goes in the tank; how full do they fill the tank; are Rhino tank replacements less??

Not to be callous but, why do we care? I run out of propane, I go to abc dealer and pay whatever it costs to fill it.... Am I going to dispute it? Ask for a "gallon" price when they have none? Drive down the road for 30 miles to save $1 or 2?

I do think that knowing "gallons" in the tank, "weight" for the tank is very beneficial and something everyone with an RV should know. When you have a "blank" tank of ? gal/weight size it's probably good to know what it "should be" but to fret over, what, $2 max in what goes in the tank? I guess I'm lost on that - and I travel all the time. I know lots of folks fret over lots of things, but for me and LP....I'm out, fill it, thank you. I spend thousands of dollars on vehicle fuel; I need fuel now, you're here, it costs x.....I don't care.

When I was a young boy my dad was anal about finding the "best" gas price. The Cosden station on the route to the next town (with the little balls floating in the top of the pump)_ sold gas for .19 a gallon. He based that for his purchases. We would drive miles, run out of gas, push the car so we could buy gas at the "cheapest" place. They even had places in the "line" where they would go out and fill up with "drip" gas. Done. Not for me.

We have reached a point with fuel prices; diesel (which used to be cheap), gasoline or "whatever" are at what used to be unbelievable prices; propane, in a small tank, 15lb./20lb/30lb., and I pay a buck or 2 more. Sorry guys, I don't care nor will I spend zero time to try to run down a cheap place, at the cost of $5-10 to save $2. As always JMO/YMMV
My OP referencing "long trips" is a bit vague, I admit, but it's clearly not about the money. More explicitly stated, when camping at 9000 feet and 50 miles from the nearest propane, I want to have the most capacity possible without dragging the extra weight/inconvenience of more tanks through the mountains. Money isn't the primary motive for the thread, but just to maintain factual accuracy for the discussion, the per-unit price of propane for exchange is almost double that of a refill (~$21 per 20lb exchange vs. $12 refill, not just $1-$2 difference)
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Old 05-15-2019, 03:06 AM   #17
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Exchange tanks will always be more costly, you're paying extra for the convenience
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Old 05-15-2019, 05:08 AM   #18
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I just bought a new 20lb tank at Costco Canada last weekend, when filling I noticed a sign that said by law they can not refill it to 100% full. It was either 85% or 90%. That is new up here.
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Old 05-15-2019, 05:58 AM   #19
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Propane tanks (of any size) should only ever be filled to 80% of stated capacity to allow for expansion of the gas as temperature fluctuates. To help avoid excessive heat gain (and subsequent gas expansion), outside propane tanks are almost always white. Interestingly enough, many of the Keystone units come through with a black plastic propane tank cover, which of course defeats the intent of painting the tanks white.


That is true, we live very rural and so live off of a 1000 gal. propane tank. Full is 800 gallons. The small tanks are white (or some light gray) just to keep the heat down. When we bought our new 26RBPR it had black covers as stated above.
I replaced with white cover.

Also agree with Frank (the OP) about capacity so replaced the 20's with 30's.

Frank, you can use them on your grill you just have to set them to the side instead of underneath.
More and more around here refill places are selling by the gallon instead of by weight. I think rather than worry about how full the 20's are, as per Sourdough, switching out to 30's is the way to go. I don't think the additional tongue weight on the TT is noticeable. I have never noticed but where do Fifth wheels carry their tanks?
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Old 05-15-2019, 10:05 AM   #20
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Most fivers have a tank on each side at the front of the unit. My old ‘97 Jayco 323RKS had both on the curb side at the front and 2 batteries on the curb side just behind the axles.
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