Acme Automatic Scraper Strainers - The McIlvaine … presentatio… · Acme Automatic Scraper...
Transcript of Acme Automatic Scraper Strainers - The McIlvaine … presentatio… · Acme Automatic Scraper...
Acme Automatic Scraper Strainers
Overview of Technical Advantages and Product Design
G.S. Presser, P. Eng. November 2004
Advantages of Scraper Strainers
Can automatically remove large and small particles,
unlike backwash strainers.
Solids accumulate at the bottom of the vessel and are
blown down using dirty water, in place of backwash from
the clean side of the screen.
Scraper mechanism eliminates stapling and blinding.
Special designs effective for low intake pressure or
suction-side applications.
Flexible control systems to reduce liquid loss during solids
blowdown.
View of Scraping Mechanism
All SS316L or Monel construction regardless of vessel material.
Durable wedgewire screen prevents blockage.
Spring-loaded blade and brush maintain contact with screen as they wear.
Large open area between scraper supports to allow large solids to fall directly to collection area.
Problems With Backwash Strainers – Typical Designs
Large solids and bio-fouling cannot be removed by these designs.
Membrane filter pre-screening
Our smallest strainer-a 6” vessel good for connections up to 3”, 200 USGPM.
Optional bypass skid to maintain flow during servicing.
Compact design, easy to install
Available in CS, SS304/316, Alloy 20, Monel and Titanium.
Filtration down to 75 micron.
Skid increases the efficiency and reduces maintenance requirements of downstream equipment.
Raw seawater intake for desalination plant
Three 24” inlet/outlet strainers in SS316L for the Dunore Point water treatment plant in Ireland.
5mm filtration, using a collector system bracketed by gate valves for solids removal.
Acme’s largest SS strainers to date.
Gate valve isolation system
The Dunore Point pumps could
not tolerate a loss of flow or
pressure upstream;
The strainer blowdown had to
be isolated from the regular
flow;
Two 8” SS gate valves were
used to bracket a collector
section;
Water was injected to assist in
dumping the solids into a
trough for disposal.
Low pressure/suction side design
4” CS strainer designed for installation in a hazardous area for sludge filtration;
Low pressure in system meant that line pressure was insufficient for adequate solids blowdown;
Gate valve closes to isolate collector while jets add pressurized water to assist blowdown;
Uninterrupted flow.
Application: River Water Intake
18” connections, 11,000 GPM
off the Columbia river.
400 micron filtration for a
smelting furnace cooling water
application.
In operation since 1996 with
very little downtime.
Complete package with
controls and blowdown valve.
Wastewater pre-treatment
Our smallest strainer-a 6” vessel
good for connections up to 3”.
Used to remove solids in a multi-
stage filtration project in NYC.
Compact design, easy to install
Available in CS, SS304/316,
Alloy 20 and Titanium.
Filtration down to 75 micron.
Application: Saltwater Intake
10” In-line strainer fabricated in CS
with special coal tar epoxy coating.
Used for saltwater intake at the Tynes
Bay Bermuda water treatment facility.
Special Ashcroft differential pressure
switch with diaphragm seals for
islolation.
Separate control panel.
Jacketed strainers for viscous fluids
6” SS304L steam jacketed strainers for a CSX terminal.
Jacket designed to keep the asphalt fluid during the transfer process.
Solids removed manually using a hand valve at the end of a batch.
“U” stamp vessel.
Pump Seal Water Protection
3” SS316L 100 micron filter used as a first pass in a multi-stage seal water filtration skid at a power plant.
Strainer output goes to two cyclone units that provide filtration down to 5 micron.
Note the booster pumps to increase velocity for the 5 micron filters.
Sewage/stormwater filtration
Strainer designed to automatically remove up to 6” stones from a waste slurry;
Tall collector bracketed by gate valves connects to flange on bottom of vessel;
Collector fills with debris, top gate valve closes and collector is dewatered prior to dump;
Ideal for applications where a settling tank is impractical.
Where Can You Use an Automatic Strainer?
River and lake water intakes with manual basket strainers
or no strainers at all.
Old duplex strainers in hard to reach areas, or that plug up
frequently.
Replace older automatic strainers manufactured by Zurn,
RP Adams, Kinney, Tate Andale, Hayward and Spirax
Sarco (scraper unit).
Low pressure situations like gravity flow from tanks.
Intakes with heavy solids loading, large solids and viscous
fluids.
Things to Remember About Acme
A custom manufacturer of strainers, process
heating equipment and gas detection systems.
In-house capabilities for mechanical, electrical and
electronic systems and controls.
Equipment made for your customer’s specific
requirements at a standard product price.
Small, responsive company with accessible and
accountable management.