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Selection
and Sizing of Basket Strainers
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| 1 |
Selection
and Sizing of Basket Strainers |
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| When
installing basket strainers, it is sometimes a good idea to use two of
them in tandem. This is especially true when there is a great deal of material
to be taken out of the line and the particles vary in size. If a single
strainer with a fine mesh lining were used alone, it would fill quickly
and necessitate very frequent cleaning. By using two strainers in
series, the first with larger opening to trap the large particles and the
second with a fine mesh lining, the load is spread out and time between
cleanings is also spread out. |
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| 2 |
A
Good "Rule of Thumb" |
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| Selecting
the proper size basket strainer for a particular application is most important.
Most reliable manufacturers have pressure drop information for all sizes.
A general rule of thumb is that pressure drop through the strainer should
not be greater than 2 psi. If it is, the strainer selected is too small.
Factors suck as viscosity, specific gravity, and mesh lining size all influence
pressure drop through the unit and they must be taken into account. |
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| 3 |
Don't
Be Mislead By Pipeline Size |
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| Thus,
the strainer size is not automatically the same as the pipe size. It may
be larger. In the case of highly viscous liquids, for instance, where pressure
drop through a mesh lined basket can cut down flow considerably it is sometimes
necessary to use a strainer several sizes larger than the pipeline in order
to insure adequate flow. However, this is not undesirable because, aside
from the slightly larger initial investment, there are no subsequent added
costs. Basket strainers last almost indefinitely and there is almost nothing
to wear out. If there is an unusually large amount of material to be taken
out of the lien, then a larger strainer is almost certainly called form.
Too small a unit will fill quickly adequate frequent basket changing. This
can be expensive in the long run. If a basket has to be changed more than
once an hour, the strainer is probably too small. |
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| 4 |
Application
Considerations |
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nature of the product also has an influence on the strainer size. Soft,
gummy materials like tars and resins are more difficult to remove and clog
baskets more quickly than hard crystalline materials. IN these cases, a
larger strainer size is also recommended. The size of a basket strainer,
therefore, is a function of the job to e done. it should not automatically
be the same size as the pipeline.
There are no
industry wide standards on face to face dimensions for flanged basket strainers,
such as there are for gate valves. For this reason, the strainer of one
manufacturer may not fit in a space designed for someone else. If there
is doubt on this point, it is best to check the face to face dimensions
of the particular unit which is going into the line. |
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Back
to Hayward Back to PEP
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Copyright
HAYWARD Industrial Products, Inc. 1999
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How
to Size a Basket Strainer