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Strainers
In Stariner Manufaturing Screen is used for the Screening Operation. Screening is the first
operation at any wastewater treatment works. This process essentially
involves the removal of large non-biodegradable and floating solids
that frequently enter a wastewater works, such as rags, papers,
plastics, tins, containers and wood.Efficient removal of these constituents will protect the downstream plant and equipment from any possible damage, unnecessary wear & tear, pipe blockages and the accumulation of unwanted material that will interfere with the required wastewater treatment processes.
Wastewater screening is generally classified into either coarse screening or fine screening. Screens may be manually or mechanically cleaned, with only the older and smaller treatment facilities using manually cleaned screens as their primary or only screening device. Coarse screens are typically used as primary protection devices, and usually have openings of 10mm or larger.
Strainers are placed in-line with process piping to remove large solid contaminants from the flow. Strainers can be cleaned and reused. Strainers can be supplied as either an assembly or an element. Strainer assemblies come equipped with a housing, cover or case, and a strainer element. Strainer elements, when sold separately, do not come as a complete assembly. A strainer element is a simple mesh or perforated metal element that may be used as replacement or a handheld strainer. Strainers can be used in a wide variety of applications, including but not limited to: general purpose, chemical, coolant, food processing, laboratory, industrial, high temperature, high viscosity, hydraulic fluid, medical or pharmaceutical, oil or fuel, refrigerant and water.
Strainer Types
Strainer types can be basket or simplex basket,
duplex basket, in-line, tee type, y-strainers, conical line or flat
plate. A simplex basket strainer is used where the line can be shut
down for short periods to clean or change baskets. It becomes an
integral part of the pipeline and all flow passes through it. Duplex
strainers remove damage causing particulate matter from the process
media, and never have to be shut down for cleaning. The line can run
continuously. When one strainer basket becomes full, flow is switched to
the other. The first basket is removed, cleaned and is ready for use
again. Some basket filters are 'temporary' and are intended for
start-up use only. In-line strainers are positioned with the basket
parallel to the line of fluid flow. They are often used in sanitary
applications. Tee type strainers are particularly adapted where basket
replacement needs to be made quickly. Y-strainers are
devices for mechanically removing solids from flowing liquids or gases
by means of a perforated or wire mesh straining element. They are used
in pipelines to protect equipment such as pumps, meters, control valves,
steam traps, and regulators. Conical line strainers are used to
protect fluid and gas handling equipment by removing debris during the
start-up of a system. They are easily installed between large flange
faces without modifying the surrounding pipe work and they are easily
removed. They are "temporary" strainers and are intended for start-up
use only. Flat plate strainers are inserted directly in the line of
fluid flow. They may also be used while held in the hand.
They are "temporary" strainers and are intended for start-up use only.
Strainers remove solids from a fluid line. Some
strainers may be available for specific types of media only. Specific
media types include liquids, gases, steam, and slurries. Selection of
strainers is dependent upon the pipe size of the process line or the
nominal pipe size that can be accommodated by the strainer. Strainers
will have a maximum service design pressure that should be specified.
The screen opening is important to consider as well The standard most
widely used in North America is ASTM E-11 standard (American Society for
Testing Materials). The opening is defined by a number (number 635 (20
µm) to number 3-1/2 (5.6 mm)) or is defined in inches (1/4 in. (6.3 mm)
to 5 in. (125 mm)). The standard used in Canada in the field of
construction materials is ISO 3310-1 standard (International Standards
Organization). The opening is defined in micrometers (20 µm to 37,500
µm). Strainer selection also depends on process temperature; the full
required range of ambient operating temperature.
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