20929 Bridge Street, Southfield, MI 48033

20929 Bridge Street, Southfield, MI  48033
20929 Bridge Street, Southfield, MI 48033
4121 Brockton Drive SE, Grand Rapids, MI 49512
6200 Baron Drive, Bridgeport, MI 48722
6910 Treeline Drive, Suite A, Brecksville, OH 44141
Phone: (800) 589-6120 - Fax: (248) 354-3710
Serving the industry since 1927
March 9, 2009 ~ This week we look at the strainers in a steam system:
Normally strainers are placed before control valves, on the steam side of the system, and before traps
and condensate pumps on the condensate side of the system.
While steam is generally
cleaner than condensate, even
small amounts of dirt in
control valves can cause
major issues. Dirt can keep
control valves from closing,
and even small particles of
dirt can accumulate and plug
up ¼” sensing lines around
controls and pressure
reducing valves. In
condensate systems the
concern is less about dirt and
more about particles of rust
or flakes of steel pipe
becoming loose due to the aggressive nature of the condensate. (CO2 in the steam becomes
carbonic acid when the condensate starts to cool) If fine mesh strainers are installed in the
condensate piping system they may clog up quicker causing more maintenance and possible
operational issues if they are not maintained properly.
Mesh, Perf, and Diameters; what does it all mean? In the world of strainers we use three terms
to describe the opening sizes of the screen. Mesh screens are normally the finest. A 20 mesh
screen has 20 openings every inch of screen. Perf is short for perforation and refers to the size of
the hole in the screen. A .062 perf screen has .062” holes or 1/16” holes. Diameter is a term
sometimes used instead of perf.
There are standard strainer screens and optional strainers screens available. For steam systems,
we recommend you specify 20 mesh screens for strainers up to 2”, .045 perf from 2-1/2” to 6”,
and .062 perf above 6”. For condensate systems we suggest .045 perf up to 2” and .125 perf
above 2”. Please note that this type of specification will result in longer lead times than the
standard off the shelf strainers.
You may ask why we change the size of the hole in small pipe versus larger pipe when it is the
same steam. The balancing act is to attempt to avoid too much maintenance while still protecting
the traps and valves. As traps and control valves get larger, so does the orifice size. If we put fine
mesh strainers throughout the system, they will plug more frequently and increase the number of
times maintenance must clean them. For these reasons the size of the hole changes with the size
of the pipe.
We offer a variety of steam and condensate strainers from Metraflex and ITT Hoffman!
Disclaimer: R. L. Deppmann and it’s affiliates can not be held liable for issues caused by use of the information on this page. While the information comes from many
years of experience and can be a valuable tool, it may not take into account special circumstances in your system and we therefore can not take responsibility for actions
that result from this information. Please feel free to contact us if you do have any questions.
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