Debris Filter
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:: Debris Filter
Macmet
supplies debris filters for protecting the heat transfer equipment against
small to medium size wastes that may have passed through upstream screens.
The Debris Filter is capable of handling various forms of debris/sludge i.e.
suspended particles/matter, mussels, grass, leaves, wood pieces, etc. The
strainer effectively prevents fouling by capturing and ejecting all debris
in an optimal manner. The optimal cleaning capability is achieved through
the incorporation of dedicated suction ports for the two basic classes of
debris – coarse and fibrous.
When fouling creates the critical predetermined pressure across the filter,
the backwash/debris evacuation sequence is initiated. The valve on the
debris evacuation pipe automatically opens and the evacuation rotor is
actuated. The differential pressure at the portals creates the vacuum by
which all the debris is evacuated. The rotor continues to clean the filter
until allowable differential pressure exists. The rotor then is
automatically stopped and the valve on the evacuation is closed.
Equipment description:
The filter body/housing is a fabricated unit complete with filter membrane
assembly, flanged inlet, outlet, debris discharge opening, pressure
measuring tapping, etc.
The filter membrane is cone shaped with inlet water entering on the concave
side. A Debris evacuation rotor is located on the inlet side which features
several slotted suction ports for removing fibrous material and other debris
captured by the filter. A broader suction portion is located at the top of
the rotor to extract larger, coarse and marine type particulate. The slotted
ports have flexible sealing lips, which concentrates suction on the filter
surface directly at the point of treatment. Because of oblique mounting of
these ports and their rotation, the larger particulate is conveyed to the
top suction port of evacuation. The debris discharge/evacuation pipe is
opened or closed by the discharge valve. A differential pressure measuring
system with a limiting contact continuously assesses the degree of fouling
on the filter and controls the actuation of the rotor and debris discharge
valve.
Instrumentation and Control System:
Complete instrumentation and control system for automatic operation of the
system, protection, interlocking, indication/annunciation of high
differential pressure and other malfunctions, etc. are provided.
The control panel is free standing type and housing all necessary
instruments, indicating lamp/annunciation, alarms, differential pressure
indicator, timer function selection switches, relays, interlocks, start/stop
push buttons, etc., complete with internal wiring.
The Debris Filter is provided with a measuring system across the filter
section/screen to check debris accumulation and to initiate debris
evacuation operation. A differential pressure gauge for manual observation
is also provided with the system.
