Minimum job performance requirements for firefighters who drive and operate
fire apparatus.
NFPA 1914
Testing FD Aerial Devices
Specifies minimum inspection and testing requirements for aerial devices to
insure a minimum degree of safety for continued use.
Applicable to aerial ladders, platforms and water towers.
NFPA 1911
Fire Pumps
Service Tests of Fire Pump Systems on Fire Apparatus
Establishes site, environmental, and equipment requirements for proper pump
system performance testing as well as frequency and procedures.
Friction Loss for Single
Lines per 100 feet
Relaypumping in fire service is movement of water by using two or more fire pumpers in series.
Tip Size
GPM
NP
2 1/2'' FL per 100'
3'' FL per 100'
3 1/2'' FL per 100'
4" FL per 100'
41/2'' FL per 100'
5'' FL per 100'
6'' FL per 100'
1''
210
50
9
4
2
1 1/8''
265
50
14
6
3
1 1/4''
325
50
21
9
4
1 1/2''
600
50
28
12
7
4
3
2
1 3/4''
800
80
51
22
13
7
5
3
2''
1000
80
34
20
10
8
5
2 1/4''
1350
80
62
36
18
15
9
2 1/2''
1650
80
54
27
22
14
3''
2400
80
58
46
29
The Capacity of Available Pumpers
Rated Capacity of Pumper
Maximum Dependable Flow
Largest Tip to be Supplied/Fog
500 GPM
375 GPM
1 1/4''
750 GPM
560 GPM
500 GPM Fog Nozzle
1000 GPM
750 GPM
1 1/2''
1250 GPM
935 GPM
1 3/4''
1500 GPM
1125 GPM
2'' or 1000 GPM Fog Nozzle
Maximum Efficient Carrying Capacity of Hose Lines
Hose Size
Max. Efficient Carrying Capacity
Friction Loss per 100 feet
2 1/2''
300 GPM
18 psi
3 (2 1/2'' couplings)
500 GPM
20 psi
3 1/2''
750 GPM
19 psi
4''
1000 GPM
20 psi
5''
1200 GPM
12 psi
6''
2000 GPM
20 psi
Maximum Distance Between
Pumpers in a Relay
FL- friction loss per
100 feet of hose layout
BP- back pressure per
100 feet of hose layout
FP- forward pressure
per 100 feet of hose layout
Maximum Distance Between Pumpers When Lines Are at Ground Level
FL- friction loss per
100 feet of hose layout
The Capacity Of Available
Pumpers
TheCapacity of Available
Pumpers
The
pumping capacity of the available apparatus is a primary factor influencing
the amount of water to be relayed. The amount of water is limited to the
pumping capacity of
the smallest
pumper in the relay. When considering relay operations, you need to know that pumpers are rated at
full capacity
at
150 psi
net pressure and at
70 %
of rated capacity at
200 psi
net pump pressure. The
NFPA
standards recommend that an annual test of relaying hose of sizes 3 ½" to 5" should be conducted at
200 psi
and at maximum operating pressure when a pumper is used in a relay of
185 psi.
When a pumper is discharging water at a pressure of
185 psi
with an intake pressure of
20 psi,
the net pump pressure is
165 psi.
Maximum flow of a relay pumper should be
75 %
of its rated capacity!
