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Theory of Operation
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The Triden™ Screen
Theory of Operation
Flow passes through the screen while solids are intercepted and collected by the continuously moving grid.
Stainless steel and plastic foot & brush assembly prevents solids from bypassing under screen while
restricting grit in the unit. Solids are transported to top of screen as flow is constantly presented a
clean grid surface. As screenings go up and over top of screen they are discharged into a container,
conveyor, screenings washer, or compactor. Wet or dry removal provides the option to effectively clean
screen and discharge wastes appropriate for disposal.
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Minimal friction is achieved through the use of Ultra High Molecular Weight Poly Ethylene (UHMWPE) and
stainless steel wear surfaces. Machined delrin spacers precisely separate every element, eliminating
metal-on-metal wear and extending life of grid. This reduces power requirements and maintenance. Wide
tracks and generous radiuses ensure years of trouble-free operation. Stainless steel grid elements provide
superior strength while reducing area and headlosses. Unlike plastic elements, our heavy gauge stainless
steel links are not susceptible to breaking or snapping off and damaging down stream equipment.
Several discharge option are available depending on disposal requirements.
Our highly effective wet removal, via a low pressure deluge washer, is a superior method of cleaning the
grid and prohibiting carry-over. The deluge washer does not require any spray headers that may clog. This
means that plant effluent or even screened flow can be used to supply washer. In addition to excellent
screening removal with no contact with the screen, the deluge washing system also acts as a supply for
screenings washer or screw conveyor. A washer or conveyor is recommended with deluge wash in order to remove
excess water.
Spray headers are an equally good alternative to deluge wash. Spray nozzles efficiently direct pressurized
water over width of grid to positively removed all screenings and prevent carryover. Spray headers remove
screening from the grid as effectively as the deluge wash, but require a relatively clean source of water to
avoid clogging. Conveyance and compaction may be recommended depending on disposal requirements.
Efficient dry removal is achieved with a easily reversibly and replaceable brush. Durable polypropylene brush "combs"
through grid removing debris and cleaning elements. Simple and effective design cleans grid, but can be unhinged
for cleaning with the removal of one snap pin and disconnected with removal of two pins. Brush assembly can then
be cleaned or replaced in a matter of seconds. Dry removal is suitable for small systems not concerned with
cleaned or compressed screenings, or may be combined with wet discharge.
If a brush is not suitable, drive unloading sprockets mechanism can be for dry discharge. This method utilizes
patented plastic or stainless steel sprockets to drive the grid as well as index through the grid. As the
sprockets push through the grid the screenings are separated and fall for disposal. All of our discharge
mechanisms eliminate the use of a rotating brush and related maintenance problems.
After years of operation this screen has continued to evolve into what it is today. While many of the early
models built in our shop have been operating for 15+ years, we feel that this screen sets the standard for
reliability in the industry. This screen is designed for engineers to get the most out of their system, operators
and superintendents to maximize their budgets, and maintenance crews to forget they have one. |
