Commercial and Industrial
Self Cleaning Filters and Strainers
The Acme ACRS Automatic Scraper Strainer
We provide single source of self
equipment. We have a complete line of filters and screens
for food, beverages, chemicals, petrochemicals, pharmaceuticals,
cosmetics, photographic solutions, fuels, gasses, liquids,
lubricants, and plating solutions.
Motorized unit designed for the
continuous removal of suspended solids from intake, process and
These units can handle heavy solids loading with particles as small
as 75 microns and as large as 150 mm (6" stones). Our strainers have
been installed on applications where backwash strainers have
suffered premature clogging, such as black liquor, heavy oils, wax,
unprotected river water intakes and boiler waste slurries.
Cleaning is accomplished by a spring-loaded blade and brush system
managed by a fully automatic control system. The blades remove
larger solids while the brush clean out the individual slots of the
wedgewire filtration element, removing smaller particles. The
spring-loaded mechanism maintains blade and brush contact with the
screen at all times. A separate blowdown timer allows the
accumulated solids to be expelled from the bottom of the strainer
vessel where they are collected during the scraping cycle. Having a
separate blowdown cycle allows our scraper strainer to use far less
fluid for cleaning than competing backwash designs.
The ACRS Scraper strainers are available in sizes 2" through 36" in
fabricated construction using carbon steel, stainless steel and
assorted alloys. All strainer vessels are designed and built in
general accordance with ANSI and ASME Sec. VIII, Div. 1. Nozzle
arrangements can be offset (standard), in-line at the top and at the
bottom of the vessel.
Oil and Gas, Petrochemical, Offshore Platforms, Fresh and Sea Water, sludge & slurry, chemical, adhesive, dyeing aides,
painting, coating, solvents, inks, resins, mechanical oils, food &
beverage, juice, fats & oils, syrup, domestic drainage,
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ACME ACRS Automatic Scraper Strainers are
used in nearly every industry to strain river, lake or
seawater intakes for plant cooling water, fire protection
and process requirements.
Process Industry - Protect heat exchangers,
pumps, valves and water spray nozzles.
Power Industry - Protect heat exchangers,
pump seal water, boiler wash water nozzles.
Pulp & Paper - White water and black liquor
Wastewater Treatment - Straining secondary
effluent to protect spray nozzles and provide plant service
Metal and Mining Industries - Provide clean
water for quenching, de-scaling, blast furnace cooling.
Method of Operation
The fluid enters the strainer vessel and passes
down into the wedge-wire screen filtration chamber, where the
inside to outside flow traps the debris on the inside of the
screen. The flow is uninterrupted and the strained clean fluid
continues into the outer ring of the strainer body and exits
through the outlet nozzle.
The scraper blades and brushes make direct contact with the
screen, ensuring that all particles are removed from its
surface, including sticky contaminants like sludge, residue,
etc. The blades also act as a pulverising agent, capable of
breaking up large solids so that they can be more easily
evacuated through the blow-down line. Backwash strainers cannot
pulverise large contaminants, which increases the risk of their
being stuck in the backwash arm during removal, or they remain
inside the strainer body pending manual removal. The blow-down
line on the scraper strainer is an opening at the bottom of the
unit, where contaminants collect during the scraping cycle.
Contaminants do not have to traverse a complicated pathway like
a backwash arm during their removal.
The control panel includes two timers, one to control the
interval between scraping cycles and another to control the
length of time that the blow-down valve shall remain open at the
end of a scraping cycle. For example, if a scraping cycle lasts
two minutes, particles can accumulate at the bottom of the unit
pending the opening of the blow-down valve. The blow-down valve
would be programmed to open for ten seconds at the end of each
minute of the scraping cycle, making for two blow-downs per
cycle. With this logic of operation, the scraper strainer uses
much less fluid for self-cleaning than backwash strainers, which
must open their backwash valves continuously during the cleaning
cycle. Also note that our unit uses only unstrained water for
blow-down, not clean water sucked back across the screen. Fluid
loss can be adjusted for minimum loss requirements. Blow-down
operation is controlled by a pneumatically or electrically
actuated ball valve on most units and a knife gate valve for
more demanding applications.
The control panel also incorporates a DPS (Differential Pressure
Switch), which will over-ride the scraper and blow-down timers
if the high differential pressure set point is reached. The DPS
will operate the scraper mechanism and open the blow-down valve
simultaneously until the HPD condition has been cleared. Control
panels are available in a wide range of designs and voltages and
can also incorporate controls for other related process
equipment if required.
ACRS Automatic Scraper Strainer
Automatic strainer for the removal of solids from intake,
process and effluent flows
Crépine Autonettoyante à grattage
Filtre autonettoyante pour l'assainissement de fluides
Filtros automaticos de las fluidos
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