MAC AVR Installation, Operation & Maintenance Manual - page 7
Publication: MAN3002G
MAC Equipment, Inc.
4
decreasing air consumption and increasing filter bag life by avoiding
unnecessary pulsing.
Air Exhaust
Returning filtered exhaust air into a facility can present hazards. The
type of dust, its characteristics and the effect of a recirculation system
malfunction must be considered. If system design dictates that filtered air
be returned into the facility, the buyer is cautioned to take appropriate
steps to monitor the air quality and provide appropriate safeguards as
prescribed by OSHA, NFPA, Federal, State and Local codes and
regulations.
INSTALLATION
The AVR filter housing and internal components are shipped factory
assembled. The hopper, unassembled support structure (if provided),
magnehelic or photohelic pressure gauges, bags and cages, service
platform and ladder/safety cage (if provided) are shipped loose and
require field assembly.
Location
Locate the AVR filter in a clear area away from normal personnel traffic
on a flat and solid concrete or steel surface. Locate the filter so as to
minimize supply and exhaust ductwork and so that explosion venting, if
required, can be directed so that injury to personnel and damage to
property cannot occur. Provide sufficient space for emptying the hopper
and maintaining the unit.
Foundation
The filter requires an adequate foundation, designed by a qualified
structural engineer. Refer to the General Dimension drawings of your
system for foot pad layout and weights. When calculating the loading for
the foundation, the weight of the filter, material collected, and all auxiliary
equipment must be considered together with snow, wind and seismic
loads.
Support Structure
A support structure may be supplied by MAC Equipment, Inc. as part of
your AVR filter system. The figure below shows a typical structure, which
will vary from system to system depending on the size of the AVR filter.
Figure 4-1 Typical Support Structure
To install the support structure:
1.
Review the components of the support structure.
2.
Loosely assemble the structure. Do not tighten any bolts until all
assembly is complete.
3.
Set anchor bolts in the foundation according to the plan drawing.
Position the legs on anchor bolts. Attach the cross bracing with
A325 3/4" or 5/8"UNC (as provided) bolts, lock washers and nuts.
4.
Tighten all bolts. Bolts must be tightened before allowing the
structure to support the weight of the filter.
5.
Touch-up paint on the support structure as needed. Assembly
should be complete and all bolts tightened prior to painting.
Setting in Place
It is recommended that a properly sized crane be used for unloading the
filter and setting it in place.
SUPPORT
STRUCTURE
HOPPER
FILTER
HOUSING
CLEAN AIR
PLENUM
TUBESHEET
Figure 4-2 Filter and Support Structure
To set up the AVR filter:
1.
Position the hopper on the support structure and fasten the hopper
to the support structure with 1/2" UNC x 1 1/2" long bolts, lock
washers and nuts.
Note: Occasionally, due to shipping limitations, the clean air plenum,
tubesheet, and filter housing are shipped unassembled. If so, apply
silicone caulk to flanges, match alignment notches on tubesheet and
flanges, and bolt together with 3/8
” UNC x 3/4” long bolts.
2.
Apply silicone caulk to the hopper flange in a figure eight pattern
around the bolt holes.
3.
Lift the filter housing and set in place on the hopper. Bolt the
housing and hopper together with 3/8" UNC x 1-1/2" long bolts, lock
washers and nuts. Tighten all bolts before removing the crane.
Explosion Venting
Venting Guidelines
This section is intended as a general guide only: For further information
refer to NFPA Standard 68, "Explosion Venting" and consult with your
insurance carrier.
Explosion venting is required whenever the filter will
process explosive dusts as defined by NFPA.
Dust filters handling explosive dusts should be located
outside of buildings wherever possible.
Explosion vents must not be obstructed in any way and
must be protected from snow/ice buildup. Explosion vents
must be oriented so that flame, explosive gases, or flying
material cannot injure personnel or damage property.
Dust filters inside of buildings should be located next to an
exterior wall; the explosion vent(s) must be ducted to the
outside of the building. Vent ducts must be kept as short
During an explosion, a vent will release flame,
explosive gases or flying material. The
explosion venting must be directed away from
personnel to prevent injury.
Spreader bars are recommended to distribute
the load evenly while lifting the filter.
Never return filtered air to a habitable space
or building without proper monitoring and
precautions.