Compressed Air Foam is constituted of 90% compressed air. Air is provided by DOT and TC certified compressed air cylinders (V2) pressurized to 3000 psi (20,684 kPa). Each cylinder is supplied with a cylinder valve (V4) equipped with a safety relief disc (V3) which provides relief at 4500-5000 psi. Air pressure regulators (V5) are used to reduce the air pressure to a working pressure of 100 psi (689 kPa) for the system operation.
The cylinders bank pressure is supervised by a pressure transducer (V7) sending a low pressure supervisory signal when the pressure goes under 2800 psi minimum pressure to provide air supply for the specified discharge time. A safety valve (A2 – mounted in the cabinet) is also used at the outlet of the air pressure regulator (V5) to protect the system from high pressure in case of malfunction. The maximum air operating pressure on the system side (downstream of the air regulator) is adjusted to 135 psi (930 kPa).
The cylinders bank is factory assembled on a painted steel skid and includes all the high pressure tubing, manifold (V8) and hardware.
Cylinder valve guards are used instead of cylinder caps, eliminating the repetitive costs associated with the use of cylinder caps. Cylinder valve guards protect the cylinder heads during shipment, therefore no protective caps have to be removed and most importantly, no tubing or fittings are required to be installed after receiving