Picture this, you are refilling a particular gas cylinder, and all of a sudden the gas stop filling!! This didn't happen to previous gas cylinders you had refilled that day, but this particular one?
So sorry.. but I did ask if it happens with the pump dispenser or the 50kg bottle? First, release the air in the cylinder you are refilling. The cylinder is full of air.
There is what we called vapor lock. This happens when air finds its way into the pipe.
What to do ?
1. Stop the pump and disconnect the filler valve from the cylinder, then purge the cylinder of vapor.
2. Also purge the pipeline and the filling hose of vapor too.
3. Connect back your filler valve to the cylinder and start your pump. The gas will flow again.
As for 50kg gas cylinder refillers, you should also know that the more you press the cylinder to release air, you're losing both gas too.
The solution still remains to purge the valve to release the (vapour) trapped air. Remove some air in the cylinder, then shake it and refill again.
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TRICKS:
To everyone using cylinder (50kg) to fill smaller cylinders without pump, make sure you design a kind of bathtub (you can use block to form it) immerse the (50kg) cylinder in the bathtub, pour water on it add ice block in the water this will make the gas content completely liquid which in turn will make filling very fast without you releasing gas vapour.
Benefits of learning. Did you learn the business? You did need to learn the skill before establishment.
So, next time you experience sudden stopage of gas during refilling, try vent out some vapour.