5-3 Operating From A HydrantOperating From a Hydrant
Hydrant Considerations
Location
Safety
Distance to incident
Obstacles
Hydrant size and supply
Grid versus dead-end main
Spotting the Apparatus
At the hydrant
Front/rear suction
Side suction
At the incident
Per direction of incident commander/company
officer
Forward Lay
Stopping at the hydrant
Dropping the end of one or more supply lines
at the hydrant
Proceeding to the fire location
Reverse Lay
Hose is laid from the fire to the water source
Used when pumper first goes to the fire
location for size-up
Most expedient method if apparatus must stay
with water source
May be used in relay operations
Hydrant Output Capacity
Outlets
Number and size(s)
Main size
Small feeder
Dead-end main
Static Pressure
Water pressure in the water system
Taken when the pump is full and the system has
stabilized
Master intake gauge indicates the static
pressure in the water system
Residual Pressure
Remaining pressure in the system when the
apparatus is discharging water
Intake gauge reading is in the residual
pressure
Formula
% Drop = (Static –Residual)(100)
Static
Example
% Drop = (70 –63)(100)
70
% Drop = (7)(100)
70
% Drop = 700
70
% Drop = 10
Additional Water
% Decrease of
Pumper Intake
Pressure Additional Water Available
0-10 3 times the amount being delivered
11 -15 2 times the amount being delivered
16-25 Same amount being delivered
25+
More water might be available, but not as
much as is being delivered
Hydrant Pumping Operations
Establish a water supply
Pump panel operations
Monitor gauges/valves
Master/compound pressure gauge
Transfer valve
Pressure relief valve
Tank-to-pump valve
Charge hoseline
Shutdown Procedures
Gauges/valves
"Tank Fill" valve to ensure full
Tank-to-pump valve per SOPs
Throttle down to idle if not pumping
Intake valve closed
Shutdown Procedures
Hydrant
Water hammer
Shutdown valve
Remove hose once pressure is relieved
Replace hydrant caps
Shutdown Procedures
Disengage pump
When pumping evolution is complete
As directed by IC/company officer
Per department SOPs
Shutdown Procedures
Supply hose
Drain water as necessary
Wash/clean per department SOPs