12. Drafting and water shuttle operation Flashcards
Atmospheric pressure
14.7 pounds
The pressure drops approximately .5 psi for every 1000 feet
A fire pump or regardless of its condition must be able to develop a vacuum equal to about ___ inch Hg
22 inch Hg
Is the height that a column of water can be lifted in a quantity sufficient to provide reliable fire flow
Dependable lift
Dependable lift is considered to be __ ft
15 ft
When you check the primer oil level in the reservoir you should also confirm that the ____hole is not clogged
Anti-siphon hole
Hold primer max ___ seconds on a 1000 gpm pump and ___ seconds maximum on a 45 gpm
30
45
A fire pump that retains any vacuum for ___ minutes should prime and draft water easily in most situations
5 min
Calculating available water in nonmoving source
Q=
Q = L x W x D x C
Constant= 7.5
Rectangular pool in IFSTA
Q= 7.5 x L x W x D
Calculating available water in a moving source
Q=
Q= W x D x V x C
Notes
Dependable lift 15 ft
The first step in preparing to draft from a water source is to find a water source
If a hole is needed in the ice to place the hard suction nose then a second vent hole will be needed as well
The ___ strainer is most commonly used for deep water sources
Barrel
The ___ strainer is designed for use in clean shallow water sources.
Low level
Used primarily with drafting from portable tanks
When you are using a barrel strainer there should be at least ___ inches of water in all directions around the strainer
24 inch
Low level and floating strainers are designed to operate in shallow conditions and require only ___ inches of water depth
24 inch
Take care not to operate the primer for longer than
30-45 sec
It is recommended that you switch to the ___stage before beginning any draft operations
Volume of parallel
NIMS use the term ___ not “tanker”
Tender
Most common methods used to offload it tender
Manual
The driver operator of the tenders should pump water through these hose lines at a maximum pressure of __ psi
50 psi
May be used to move the water from one thing to another
Jet siphon
What is the most common source of flow restriction when performing a draft operation
Clogged strainer
