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What is static pressure?
When water is at rest
What is water hammer?
The force of water from opening/closing water fast
Wet barrel hydrant:
locations where freezing is not an issue, barrel full of water, each outlet individually controlled by stem
Anomalies:
dry barrel 25 turns to open, wet barrel 10-15 turns, yorba linda 4.5 to 4’’ adapter,
Capacity of water tenders?
1,800gallons attack, 3500 support
What is normal operating pressure?
During hours of normal consumption
What happens when mains and hoses are full of water?
Water hammer is reduced
What are the components of a wet barrel hydrant?
top-bonnet, barrel-main body, operating stem-attached to
compression valve, stem nut is 1 ¾ pentagonal, discharge outlets 4’’ or 2 ½’’ male national
standard thread, caps 4’’ or 2.5’’ nst cast iron or plastic, hollow bolts, valve stem made of
bronze (important parts made of bronze, outside parts are cast iron)
Hydrant shut off
in-line with hydrant with blue caps and control individual hydrants
Use sectional valve when hydrant valve is not located.
Capacity of portable water tank?
2,100 gallons
What is residual pressure?
Pressure left when quantity of water is flowing to different locations
How far apart are residential hydrants? high value?
500' in residential and 300' in high value
Dry barrel hydrant:
located in freezing areas, valves located at base, open by nut on top, has drain holes
What are our portable pumps rated at?
50gpm up to 350gpm
What is flow pressure?
Pressure at outlet/discharge opening
Hydrants are at _______ and at ______ if over the distance
every intersection and at midblock if over the distance
How long do you flush hydrants?
Until the water is clear
Mini striker on type 3 engines:
2.5hp 4 stroke 1.5’’ discharge, max 68gpm at 85psi
What is a limiting factor of mains?
age/condition
Hydrant spacing is based off?
occupancy and size of building
When connected to a hydrant on a pony line ....
2.5’’ supply will give you 450 gpm, 3’’ pony line will give you 750 gpm, 4’’ pony line will give you 1500gpm.
Floto-pump on 100 series engines:
8hp 2 stroke 1.5’’ discharge, 140gpm @ 105psi