Pump Class notes Flashcards
1
Q
When length of hose is doubled FL is ______?
A
- Doubled
2
Q
When flow is doubled FL is _______?
A
- Squared
3
Q
Chimney nozzles are designed to flow ____ gpm at 100 psi at the tip.
A
- 3-5 gpm
4
Q
Smooth bore 1” hand line at 50 psi flows about ____gpm?
A
- 210 gpm
5
Q
If the hose diameter is doubled the opening are is ___?
A
- X4
6
Q
Main Sizes
- Residential
- Commercial
A
- 6” min
- 8” min
7
Q
Fire rated pump
A
- 750 gpm
- Pressure relief device
- Front-mount, Engine driven, or transfer driven
( Midship, or Rear mount)
8
Q
Nozzles
- Solid bore, not mounted
- Solid bore, apparatus mounted
- And Broken Stream (fog)
- FDC
- Master streams and stand pipes
A
- 50 psi
- 80 psi
- 100 psi
- 150 psi, unless otherwise posted
- add 25 psi
9
Q
Nozzle Reaction
A
- Pressure felt while flowing water, reaction is normally half of the gpm.
- NR Q/3 for solid stream
- NR Q/2 for fog
Newton’s 3rd law- for every action there is an equal and opposite reaction.
10
Q
Primary feeders
A
- Large mains that carry large quantities of water to a town
11
Q
Secondary feeders
A
- Smaller mains that carry water to smaller areas
12
Q
Distributors
A
- Smallest pipes carry water to users and hydrants
13
Q
Loop system
A
- System that is supplied by multiple lines
14
Q
Dead end water mains
A
- Supply water from only one direction
15
Q
Grid
A
- Supplied by multiple lines in a grid like system
16
Q
NFPA 24
A
- Hydrants
from center of outlet to finished grade
17
Q
Municipal water system
A
- water under pressure through hydrants
- System has water source, treatment plant & distribution
18
Q
Static water source
A
- Lakes and Rivers
19
Q
Flow
A
- Quantity of water moving through a pipe, hose, or nozzle in gpm.
20
Q
Flow pressure
A
- Quantity of water flowing through an opening during a hydrant test
21
Q
Static pressure
A
- Pressure in the system when water is not moving
22
Q
Head Pressure
A
- the height of water supply above the discharge orifice.
23
Q
Normal operating pressure
A
- Pressure in system during normal consumption hours.
24
Q
Residual pressure
A
- Pressure that remains in the system when water is flowing.
25
Atmospheric pressure
- 14.7 at sea level
| - greatest at low altitudes
26
Pumping
| - Intake pressure
- Pressure coming into the pump from hydrant
27
Pumping
| - Pump discharge pressure
- Water that leaves the pump and enters hoselines
28
Pumping
| - Net pump discharge pressure
- Actual amount of pressure being produced by the pump. The difference between the intake pressure and the discharge pressure.
29
Friction Loss
- 5lbs per floor
- 5lbs per sec of 4" (100')
- 10lbs per appliance 350gpm or above
- 10lbs per sec of 2.5" (50')
- 15lbs sec 1 3/4" (100')
- 25lbs master stream or standpipe
30
FL=CQ^2L
FL=C(Q/100)2(L/100)
- C=15.5 per sec of 1 3/4"
- C= 2 per sec of 2.5"
- C= .2 per sec of 4"
31
Laws of specific heat
- Measurement of the heat- absorbing capability of a substance
32
Laws of latent heat
- Quantity of heat absorbed by a substance when it changes from a liquid to a vapor.
