Pierce Pumper, Operation & Maintenance Manual, Page: 12 / 66

TO THE OWNER
1-6 / Pierce Pumper
© 2019 Pierce Manufacturing Inc. All Rights Reserved.
1-8.3 Intake and Discharge Cap Removal
NOTE: One sign of trapped pressure is a cap that does not turn easily. If the cap is difficult to remove,
double check that the drain valve of bleeder valve is not plugged and that all the pressure is relieved
before proceeding.
Most fire apparatus include caps on the end of inlet and discharge pipes. These caps often have a control valve in
the pipe just behind them. If this valve is opened and then closed again while the plumbing is pressurized, this
pressure can be trapped between the valve and the cap even if the pump is not operating and all the gauges read
zero pressure.
NEVER attempt to remove any inlet or discharge cap on your aerial apparatus until you are certain there is no
trapped pressure. Open the bleeder valve or drain valve between the control valve and the cap to ensure that any
trapped pressure is released. Then remove the cap slowly and carefully. Do not stand in front of the cap. If you
remove a cap that has pressure trapped behind it the cap may fly off with great force, injuring yourself or others.
1-8.4 Hose Testing
NFPA 1962
“Standard for the Inspection, Care, and use of Fire Hose, Couplings, and Nozzles and the Service
Testing of Fire Hose”
provides requirements and testing procedures for service testing fire hose.
ALWAYS OPEN Drain/Bleeder Valve BEFORE removing Inlet or Discharge cap.
Discharge lines can trap pressure if the valve is opened and left closed.
Discharge cap under pressure will blow off with explosive force.
Exploding cap may injure or kill.
Hose Testing Hazard. Do not use apparatus to test fire hose.
Due to a potential for catastrophic hose failure during service testing of fire hose, it is vital that safety
precautions be taken to prevent exposure of anyone to this danger. Fire pumps on fire department
apparatus are not designed for and should not be used for service testing of fire hoses. A hose testing
machine should be used for testing of fire hoses.
Failure to comply may result in serious personal injury and damage to equipment.