Vol X 1012.10B Pumping Ops Flashcards
What are two basic pumps used by FD ?
What are two basic pumps used by FD Positive displacement pump and centrifugal pump
Describe a positive displacement pump
Positive displacement pumps move a given amount of water or air through a pump chamber with each stroke or rotation
Two kinds of positive displacement pumps
Rotary gear and rotary vane
Describe centrifugal pump
In theory the operator of a centrifugal pump is based on the principle that when water is introduced at the center of the rapidly revolving disc it will tend to throw the water to the outer edge of the disc centrifugal pumps do not pump air
What type of centrifugal pumps are there? (2)
There are single stage and two stage centrifugal pumps
Describe Series/pressure operation
Series/pressure operation the pump will theoretically be able to discharge twice the pressure but only half the rated capacity of the pump
Describe parallel/volume operation
In parallel/volume operation the pump will theoretically be able to discharge the rating capacity of the pump but only have the rated pressure
What does the transfer valve determine?
The transfer valve determines series or parallel operation
what position should transfer valve be placed in?
Transfer valve should be placed in the position most likely to be used at the next fire which is pressure
When can transfer valve can be safely operated?
Transfer valve should be placed in the position most likely to be used at the next fire which is pressure to change from series to parallel pump must be slowed until there is not over 30 psi pump pressure and then transfer valve can be safely operated
When is Slippage is automatically allowed?
Slippage is automatically allowed when one discharge line or gate is shut down
If discharged gate is not open or other cooling procedures are in place what will happen?
pumps will heat up very rapidly and or cavitate or caused damage during opperation unless discharged gate is open or other cooling procedures are in place
What is cavitation?
cavitation is a condition in which air cavities are formed in the pump resulting in vibrations and loss of efficiency and possible damage to the pump
Cavitation is AKA ?
A.k.a. described as the pump running away from the water an indication of cavitation could be increase rpm’s without increased pressure
How can cavitation be eliminated?
Cavitation may be eliminated by a reduction water flow or slowing engine RPM to 1000 and priming pump until discharge
Two reasons Cavitation can take place when pumping from a hydrant?
Two reasons Cavitation can take place when pumping from a hydrant 1 . pumping more water than the hydrant can supply 2 . using too small and intake
What is the purpose of pressure control devices?
The purpose of pressure control devices is to protect personnel from dangerous pressurized second is to protect hose and pumps
Automatic pressure control device also known as?
Automatic pressure control device also known as relief valve
Electronic pressure control governor operate independently from ___________ and regulate pump pressures by controlling _________
Electronic pressure control governor operate independently from relief valve and regulate pump pressures by controlling rpm’s
Set pressure control device prior______________ and at least ________________ going into operation
Set pressure control device prior to second line and at least no later than the second line going into operation
Most critical Gages are ? (5)
Most critical Gages are pressure, engine temperature, rpm’s, engine pressure
What panel gauges should be compared to apparatus? (3)
Compare apparatus gauges to pump panel prior to shut down , temperature air rpm fuel
Do not exceed______ mph when laying supply line
Do not exceed 15 mph when laying supply line
When laying supply line remeber to_____________ for other companies
Remember to allow access for other companies
When operating as a forward pumper consider four things
When operating as a forward pumper consider four things
Apparatus placement fire conditions volume of water residual pressures
Never pump any supply line at _____ psi or higher
When operating key/supply pumper consider
Hydrant capability for pumper supply line being operated… Never pump any supply line at 1:50 psi or higher consistent pressure on changing for condition
The following are advantages of_______________
more water available, initiates building attack teams, simplizes changing from offense to defense, better pressure control, minimize congestion
Advantages of forward/supply pumper operations
more water available, initiates building attack teams, simplizes changing from offense to defense, better pressure control, minimize congestion
What are Two major troubleshooting issues?
Two major troubleshooting hot engine hot pump
During pumping and driving engine temperature should be ______ to ____°
During pumping and driving engine temperature 160 to 190°
Ways to cool engine? (3)
Fog spray hose line under front of truck, open engine cowlings for additional airflow,
Spray water directly onto radiator
What is the Built in factory assist?
Built in factory assist …indirect cooling where water flows from fire pump to heat exchangers at bottom of the engine radiator removing from coolant
Direct cooling… it’s disconnected
PFD/unsure GFD?
Direct cooling… it’s disconnected
If pump is not cooled firefighters could be ______ and the pump _____ or ________
If pump is not cooled firefighters could be burned and the pump damage or cavitated
Ways to cool pump (4)
by operating nozzle of charge line, open discharge gate, open redline and return it back to tank water on a fog, hooking up to supply line run in freshwater to pump
If the pump _______________ you should check for air leaks. no oil and priming tank.defective priming valve, engine speed to low during priming, priming home not operated long enough, tank to pump though closed no water in palm
If the pump is not prime you should check for air leaks. no oil and priming tank.defective priming valve, engine speed to low during priming, priming home not operated long enough, tank to pump though closed no water in palm
Check the following if _______________ occurs.
discharge gate closed, pump speed to low, transfer valve said improperly, governor sent him properly, relief valves improperly, pump capacity limits pump pressure, improper holes evolution
Insufficient or no pump pressure you should check discharge gate closed, pump speed to low, transfer valve said improperly, governor sent him properly, relief valves improperly, pump capacity limits pump pressure, improper holes evolution
