HomeMy WebLinkAbout313.010 - Supplying Two Different Sized Lines
TRAINING AND EQUIPMENT MANUAL
DRIVER/OPERATOR SKILLS
313.010 SUPPLYING TWO DIFFERENT SIZED LINES
EFFECTIVE: MARCH 2016
Current Revision Date: 10/27/21 Next Revision Date: 10/27/23
Author’s Name/Rank: Robert J. Garcia, Engineer Review Level: 1
Administrative Support: Tammy Williams
Management Analyst II
ADA
PURPOSE
To define standard operations for supplying water to two different sized lines.
APPLICATION
Fresno Fire Department (FFD or Department) members operating two different sized
hose lines being supplied by FFD apparatus.
OPERATIONAL POLICY
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OPERATIONAL GUIDELINE
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PROCESS
1. Spot apparatus and prepare for standard pump operations.
2. Establish an external water supply.
3. Charge hose lines.
a. Any combination of the above-mentioned hose lines may require
different pump discharge pressures (PDP).
Section 313.010
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Caution: If you supply most 2-1/2” hose lines with the same
pressure prescribed for small handlines, the firefighters on the 2-1/2”
hose are likely to receive unmanageable nozzle reaction pressure.
b. Charge higher pressure line first when given the option.
4. Ensure the discharge requiring the highest PDP is being supplied
appropriately.
5. Properly set the Relief Valve.
6. Attempt communication with the firefighters staffing the hose line
requiring a lower PDP and advise them to prepare for excessive
pressures when their nozzle is initially opened.
7. Gate down lower pressure line appropriately.
c. Always refer to the specific hose line discharge gauge for discharge
pressures relative to that hose line. The main Pump Discharge
Pressure gauge should not be used to determine individual hose line
pressure.
d. While the nozzle on the lower pressure line is fully open, the
discharge valve can be adjusted to gate down excess pressure as
required to the appropriate PDP for the specified line.
e. Remember, when nozzles on gated down hose lines are closed, the
respective discharge line pressure is to return to a static and now
excessive pressure. Do not make any adjustments to the discharge
valve position or throttle to correct this condition. When the nozzle
is re-opened, appropriate pressures resume.
8. Never allow discharge pressures to fall below or exceed target PDP by
more than 30 psi for firefighter safety.
9. Check undercarriage for leaks.
a. Water
i. Close open bleeder/drains.
b. Fluid
ii. Oil, radiator, etc.
10.Assess water supply/update command, as needed.
11.Observe the following:
Section 313.010
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a. Water tank level.
b. Engine temperature.
c. Oil pressure.
12.Note abnormal noises or concerns.
a. Motor noises, pump noises, etc.
13.Additional note.
a. Safety concerns.
b. Need for further training/improvement in specific areas of IPE.
c. Any additional notes the evaluator offers.
INFORMATION
The challenge with supplying two different sized hoses is delivering two different pump
discharge pressures (PDP) from the same manifold; theoretically, this cannot be done.
Fire apparatus manifolds are not equipped with adjustable in-line pressure regulators;
the pressure delivered to one discharge valve is the same pressure delivered to any
other discharge valve at the manifold. If all attack line discharge nozzles are closed,
pressures within all charged hose, being “static”, is the same as the main PDP. Lower
flow pressures to specific lines can only be created when the nozzles are open. While
flowing water, friction loss can be created by “gating down” individual discharge valves
as necessary to achieve a lower flow pressure.
DEFINITIONS
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CROSS REFERENCES
Training and Equipment Manual
Section 303.004, Pressure Control Valves
Section 313.005, Standard Pump Operation
Section 313.006, Supplying Small Handlines
Section 313.007, Change-Over from Tank to Hydrant
Section 313.009, Supplying 2-1/2” Lines
Section 313.010
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IFSTA Pumping and Aerial Apparatus Driver/Operator Handbook, 3rd Edition Smeal
Section 313.010
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