Pumping Apparatus Driver Operator (1st Edition)-Chapter 15 ...

The first high energy foam systems were termed Water Expansion Systems (WES) and Water Expansion Pumping Systems (WEPS) and used air cylinders for the compressed air. Compressed Air Foam Systems (CAFS) use a direct-injection foam proportioning system on the discharge side of the pump that is aerated by compressed air which comes from a rotary ... ................
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