Drafting Flashcards
Water has no tensile strength, therefore cannot be pulled up. What additional factor is involved during drafting operations
Atmospheric pressure
When measuring lift, lift is measured from _____to the ______
Water level / center of pump
Theoretically the max lift of a pump is _____ , but in common practice lift is actually _______ or ______
33.9
Two thirds or 22 2/3
Internal combustion engines lose what % of power with an increase of 1000’?
3.5%
Bonus : poor weather with a drop of atmospheric pressure can easily result in how much loss of lift? 1 foot
The AOTM states that, during a drafting operation, the source should be _____ feet deep and be submerged at least ______ feet.
4 feet
2 feet
According to the AOTM, how are pumps capacity rated for drafting?
6” suction at 10’
True OR False
You must be in pressure when attempting to draft?
False, use volume as it will evacuate air faster
According to the AOTM, if a pumps rated capacity is less than 1500 GPM, what is the time limit on pulling the priming pump? What is the time limit if greater than 1500 GPM.
30 sec and 45 sec
If their is a leak in the suction hose, where usually is the leak going to be located, according to the AOTM?
The 1st coupling below the pump inlet
What does it mean if there is a high reading on the vacuum gauge with no water entering the pump?
The lift is too high or a clogged strainer
During a temporary shutdown in a drafting operation, what pressure should you continue to flow from a discharge gate in order to keep a prime?
35psi
If connecting to a piping system, after receiving permission from a chief officer and using salvage cover to create a broken connection, what is the minimum depth of the hole that should be considered?
3 feet
