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post #1 of 27 (permalink) Old 25-01-2019, 10:48 Thread Starter
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Refilling LPG

I didn't want to put this on Mikes thread as it would be lost.
We spoke about refilling sometime last year, some turned off the bottles first, some didn't, including us.
Until recently it made no difference at our regular filling station and then Hans discovered on the last two fills it didn't fill to the limit. This time he turned off the bottles and they filled with no problem. It seems a safety device must have been fitted to the garage system.
Just thought I would tell you

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post #2 of 27 (permalink) Old 25-01-2019, 12:31
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Perhaps you or Hans have an idea as to how such a safety system fitted to the pump supplying the LPG might work Jan.

I can't imagine one.

The delivery pump stops when it's delivery pressure is no longer sufficient to overcome the resistance in the container being filled. That resistance can be provided several ways. The tank is full and no more can be pumped in or an automatic cut off in the tank has shut the inlet so that no more can be forced in.

The pump may also have a volume monitoring function so that if the flow through the pump exceeds that which the pressure and pipe sizes allow it may shut off automatically.

I can't see how the pump could know whether you'd shut the gas valve/s off though.

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post #3 of 27 (permalink) Old 25-01-2019, 12:36
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How does it know when it's 80%.?
I guess as you say Alan pressure.


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post #4 of 27 (permalink) Old 25-01-2019, 12:39
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In my limited experience with LPG I've found that garage pumps vary in quality.

I filled my underslung tank at one PFS station which said full when my dashboard guage suggested it wasn't. Went to another station and found I could put more in.

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post #5 of 27 (permalink) Old 25-01-2019, 13:11
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Be careful of exceeding the 80% recommendation John as the regulators are only designed for gas and can fail when in contact with liuid.


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post #6 of 27 (permalink) Old 25-01-2019, 13:16 Thread Starter
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Coowee, If you need to be misled I'm your gal
So sorry, its our bottles that must have the safety valve Hans thinks and sometimes it works and sometimes not.
So maybe it is best to turn off the bottles before filling to make sure they get as much gas as pos.

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post #7 of 27 (permalink) Old 25-01-2019, 13:22
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When filling our two 11 kgs Gaslow bottles, empty or part empty, from all the Pumps we've used at home or abroad there has been no difference in the amount delivered whether the bottles are off or open.

You can put extra gas in above the 80% limit but it is very slow and shouldn't be attempted.

Some pumps deliver the gas at speed and some are slower but if it's taking an age to deliver you either have got to the 80% limit or you have a problem with one or more of the cylinders - seek professional advice if it's the latter.
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post #8 of 27 (permalink) Old 25-01-2019, 13:29
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Quote:
Originally Posted by raynipper View Post
How does it know when it's 80%.?
I guess as you say Alan pressure.


Ray.
With refillables it's a float valve inside Ray.

With normal cylinders I understand it's weight.

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post #9 of 27 (permalink) Old 25-01-2019, 17:05
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And are there no safety issues with leaving the bottles open while fillies, or even just when on the garage forecourt?

I'm sure the question has been asked before but can't remember if there was a definitive answer.

Jean
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post #10 of 27 (permalink) Old 25-01-2019, 17:05
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Quote:
Originally Posted by raynipper View Post
How does it know when it's 80%.?
I guess as you say Alan pressure.


Ray.
Because the 80% cutoff float inside the bottle shuts of the fill inlet. The pump senses that no more gas is able to flow as it is pumping against a closed inlet.
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