Intake Strainers
 Usually
a dry hydrant system will consist of two main components, the head
assembly and a strainer. These two components are connected by a
pipe, which carries the water from the strainer to the head. As
a dry hydrant system is usually a suction supply it is critical
to eliminate friction loss as much as possible. (See dry hydrant
flow calculations for detail) For this reason it is important to
pick a strainer with a high intake ratio. (Open hole area compared
to head area) A 4:1 ratio is ideal and a 2:1 should be minimum.
The selection of a strainer is dependent upon the
application and requirements to meet the needed fire flow (NFF).
Factors which should be considered in selecting a strainer are:
the depth of water source, type of source, flow conditions, drought
conditions, flood possibilities, water source fluctuations, bottom
conditions, floating debris, suspended debris, fish, Zebra Muscles,
Barnacles, vertical lift and needed flow rate. Specific details
on many of these concerns are provided for your consideration.
Features and Benefits
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Horizontal strainers have a patented V-shaped
hole pattern, which assures low suction zones. Allows 100% pull
down to the line of holes at 1,500 gpm with no pump cavitation.
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Optional strainer designs allow application
customization to maximize system performance.
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PVC strainers have optional fixed or back flush
end caps. These designs are engineered to promote maximum cleaning
of strainer holes during back flushing. Back flush cap is molded
closed and requires some back pressure before it will open fully.
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100% corrosion free materials; either PVC or
Aluminum construction.
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6" Horizontal strainers are designed for
unique single point SST support clamp. This clamp is adjustable
to fit the desired height above the bottom.
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Strainers can also be made with a built-in check
valve which will eliminate the danger of primer motor burnout
when long dry pipes present themselves. (Maximum continuous
priming time with most manufacturers is 1 minute)
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Screw-on design is available for salt water
maintenance applications where removal for cleaning is necessary.
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Swimming pool strainers and flange kits are
designed for vinyl concrete lined pools.
Size and Styles:
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