Operation Under Usual Conditions (Cont)
2-128. FOAM SYSTEM FLUSHING.
a. General Description.
Foam agent can cause operating components, such as valves,
to stick if solution is allowed to dry. Many types of foam
agents have penetrating properties, which can remove or
Special attention should be given to lubrication
requirements of equipment normally in contact with foam
solution such as valves, monitors, nozzles, etc. More
frequent lubrication may be necessary. It is recommended
that the water pump and delivery system components be
flushed before they are returned to a "ready" condition.
The foam system is composed of materials that are compatible with foam
b. Foam Agent Piping Flush Procedure.
Open and close all valves slowly during any procedure.
Sudden changes in pressure may cause equipment to
react faster than personnel can be alerted. Make sure
surrounding personnel are aware of changes being made
to settings on equipment. Failure to comply may result in
injury or death to personnel and damage to equipment.
Make sure to close all valves once water runs clear.
Foam system flushing procedure must be done using
on board water tank.
Using pressure governor, decrease engine RPM to reduce water
pressure (para 2-115).