7/28/2019 Strainer Open Area Ratio
1/1
13.06.13 Strainers, Filters, Basket Strainers, Y Type Strainer,
T Type Strainers, Conical Strainers, Candle Filters, Cartridge
Filters, Mumbai, India
www.virastrainers.com
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Basket Strainers
( Simplex / Duplex type )
'Y' Type Strainer
'T' Type Strainers
Conical Strainers
Candle Filters /
Cartridge Filters
Pleated Filters
Resin Trap
1, Mhatre Comp., Behind Lalit
Weigh Bridge, Sonarpada,
Dombivli (E), Thane - 421204.
Tel.No : (0251) 2871170 /
9930003873
Fax No : (0251) 2871170
E-Mail :
MSME certificate
An official definition adopted by the Fluid Controls Institute
is : "A closed vessel w ith cleanable screen element
designed to remove and retain foreign particles. Note the term
"foreign particles". Strainers do not necessarilyremove only dirt.
They take out material which is not wanted in the fluid and this
can sometime be a valuable
product which may be saved.
WHY STRAINERS & FILTERS ? OPEN AREA RATIOThe problem of
unwanted material in pipelines is a
never ending one. Whether the flowing material as
seawater, oil, paint or a variety of food or chemical
products, there is often something present that can
cause trouble. Dirt, foreign matter, or even clumps of
the product itself can clog or damage pumps, spray
nozzles, condensers, and similar equipment.
Sometime a finished product has to be rejected
because of the presence of undesirable solid matter.
It is the ratio of the open area through the strainer
basket to the cross sectional area of the pipeline.
A well designed \ basket strainer shou ld have an
open ratio of at least 4 to 1. Anything less may
cause excessive pressure drop. The ratio is
calculated with a clean basket and as the basket
begins to clog the ratio will drop. Unless there is a
wide safety margin the area through the basket
may quickly become smaller than the pipe area.
This will reduce flow through the strainer and
necessitate very frequent cleaning. A small open
area ratio also means the holding capacity of the
basket is s mall - an important consideration if theamount of
solid matter to be removed is large.
CRITERIA FOR SELECTION OF PROPER STRAINER
The material of construction The debris loading
The des ign and working pres sures The s eal m aterial (o-ring
or gas ket)
The design and working temperatures Whether the line flow can be
interrupted or not for
basket,screen cleaning
The service (liquid or vapor) The clean start up pressure
The flow rate and vis cos ity (if a liquid) The location of the
s trai ner
The particle size to be retained
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