BNP PRESSURE BLAST CONVERSION KIT Page 8
5.2 Media Metering
These instructions are for a standard machines with
Sentinel Metering Valve. Optional metering valves
may function differently, but the process is similar.
5.2.1 Media flow is adjusted by the metering valve
located at the bottom of the blast machine. The valve is
closed when the handle is fully right. To adjust, close the
valve and slowly move the handle to the left to increase
media flow. Allow time for the flow to stabilize before
further adjusting. The valve is fully open when the
handle is at the full left position. The correct flow rate will
depend on the type and size of media and blasting
pressure, and can best be determined by experience.
Use as little media as possible to do the job while
maintaining the best cleaning rate. Generally, with the
correct mixture, abrasive can be seen as light
discoloration as it exits the nozzle.
5.3 Static Pressure
5.3.1 Correct static pressure varies with size of
reclaimer and the size, weight and type of media.
5.3.2 Adjust static pressure by adjusting the damper
as recommended by the dust collector manufacturer. If
the damper is not opened enough, the reclaimer will not
remove fines, resulting in dusty media, poor visibility,
and possible media blockage in the conveying hose. If
the damper is opened too far, it may cause carryover
(usable media carried into the dust collector) and result
in excessive media consumption. Open only as far as
necessary to obtain a balance of dust removal without
media carryover.
5.3.3 A manometer is useful when adjusting or
monitoring static pressure. Manometer kit is listed under
Optional Accessories in Section 9.1. The following are
static pressure starting points for given media. Static
pressure may need to be lower with finer media, higher
with coarser media.
Glass Bead No. 8 to 13 .................................. 2-1/2 - 3"
Alox. 60 & coarser ............................................... 4 - 5"
Alox. 80 & finer .............................................. 2-1/2 - 3"
Steel Grit ............................................................. 6 - 7"
5.3.4 If the damper has been adjusted and carryover
or excessive dust in the media continues to be a
problem, the optional adjustable vortex cylinder, which is
standard on pull through reclaimers, may help retain
media. The vortex cylinder is usually required only when
using 200 mesh and finer media, or lightweight media.
See Section 5.4, and Accessories in Section 9.1.
5.4 Optional Externally Adjustable Vortex
Cylinder (standard on pull-through reclaimers). For
use with fine-mesh or lightweight media.
5.4.1 The adjusting lever for the vortex cylinder is
mounted on the spacer above the reclaimer body. Start
with the lever in the vertical position. Before adjusting
the vortex cylinder, adjust the damper on the dust
collector to increase or decrease static pressure per
Section 5.3. Once the damper is adjusted, adjust the
cylinder as follows.
5.4.2 Dusty Media: If the reclaimer is not removing
sufficient quantities of dust, raise the cylinder by moving
the lever left toward "COARSE", in 1/4" increments at
the indicator plate. Do not adjust again until the media
has gone through several cycles, to be certain further
adjustment is required.
5.4.3 Media Carryover: If too much media is carried to
the dust collector, lower the vortex cylinder by moving
the lever right toward "FINE", in 1/4" increments at the
indicator plate. NOTE: If the cylinder is lowered too far,
the reclaimer will again begin to allow usable media to
be carried over, and cause abnormally high static
pressure.
5.4.4 When using very fine media (200 mesh and
finer), the reclaimer inlet baffle may also need to be
removed. Consult the factory before proceeding with this
option.
6.0 PREVENTIVE MAINTENANCE
Failure to wear approved respirators and eye
protection when servicing dust-laden areas of the
cabinet and dust collector, and when emptying the
dust collector could result in serious eye irritation
and lung disease or death. Toxicity and health risk
vary with type of media and dust generated by
blasting. The respirator must be approved for the
type of dust generated. Identify all material being
removed by blasting, and obtain a material safety
data sheet for the blast media.
NOTE: To avoid unscheduled downtime, establish a
weekly inspection schedule. Inspect all parts subjected
to media contact, including; nozzle, media hose, flex
hose, plus all items covered in this section.
WARNING
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