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Aotm lesson #17 pump and trouble shooting
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when drafting maintain __ psi so not to lose prime
35psi
When drafting allow _ min of cooling before shut down
5 min
Failure to prime
-air leak indication
Low vacuum on suction gauge
2 ways to test for air leaks
Air leak test
-failure to reach 10" of hg in 10 min indicate a leak in pump.
Water leak test
- hook up to hydrant cap discharge outlets and look for water leaks
Listen
Dirt on suction strainer indicates
High vacuum
Ways to protect suction strainer
- suspend from log or other float, anchor float
-remove top of barrel place below waterline
-make suction Bo's using fine mess screen
Do not attempt lifts of greater than __ ft except @ low altitudes
22 ft
Place strainer _ft below water line. Water should be at least _ ft deep
2ft
4ft
If high point can't be prevented during draft.
Close discharge valve as soon as pressure drops then reprisereprise
Pump with 1250 gpm do not operate prime more than __sec
pumps with 1500 gpm no more than __ sec
30 sec
45 sec
Most likely cause of pump not reaching capacity
Low horsepower
-
causes
- throttle not fully open
- ignition timing incorrect
-clogged filter bowl
- engine to hot
-improperly set governors
Air leaks when pumping
High rpms
Hose pulsating
unsteady pressure gauges
remedy-
check pump for holding vacuum
Restricted suction causes
High rpm
fluctuating pressure gauges
high vacuum reading on compound gauges
Power generated by internal combustion engine decreases __% for ever ____ft elevation
3.5%
1000ft
Lift to high will cause
High engine speed
High vacuum
pump roughness and pulsating pressure gauges
If water too warm __degrees sufficient ____ ____ may be given off to affect the pump operation.
85 degrees
water vapors
Place transfer valve in volume when pumping __% of rated capacity
70%
When new clearance between impeller hub and clearance ring is?
5-7 thousandth of an inch
Replace clearance rings and impellers when clearance is
More than 15-20 thousandth of an inch
measured by a feeler gauge
Author
Ccadena
ID
277893
Card Set
Aotm lesson #17 pump and trouble shooting
Description
Aotm lesson #17 pump and trouble shooting
Updated
7/2/2014, 4:16:56 AM
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