Familiarise with High Pressure Terminology

Compressor Dictionary - F

Filling by Means of Storage Cylinders

Frequently, cylinders are replenished using storage cylinders, which have been filled in advance. The full storage cylinder and the empty recipient cylinder are connected using a high pressure tube (please note that these tubes require annual inspection). The storage cylinder's valve is opened fully. Thereafter, open the recipient cylinder's valve slowly. This procedure prevents damage to the valves and sinter filters. Pressure equalises rather slowly since the expanding gas in the storage cylinder cools off during the filling process. Concurrently, the recipient cylinder cools down near the valve and heats up lower down. Identical pressures require identical temperatures.

If several storage or recipient cylinders are being filled, the bottles with the least pressure differential are connected.

Example:

Storage cylinder: 50 litres at 200 bar
Recipient cylinder: 10 litres at 20 bar

Content of the storage cylinder:	50 litres × 200 bar	= 10 000 litres at 1 bar absolut
Content of the recipient cylinder:	10 litres × 20 bar	= 200 litres at 1 bar absolute
	Total volume:	Total content:
	60 litres	= 10 200 litres at 1 bar absolute
Final pressure after equalisation:   10 200 litres at 1 bar absolute   = 170 bar 60 litres

 

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