BNP
®
65 and 220 SUCTION BLAST CABINETS
Page 14
© 2019 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 21309, Rev. J 01/19
5.2
Air Jet Adjustment ‒ Figure 17
5.2.1
Thread the air jet 4-1/2 to 5 full turns into the
gun body. Doing so will leave 3-1/2 to 4 threads exposed
past the lock nut. Tighten the lock nut to maintain the
setting. Refer to Section 9.3 for optional adjusting tool,
which correctly positions the jet. Instructions are
provided with the tool.
Figure 17
5.3
Media-Air Mixture (media flow) ‒ Figure 18
5.3.1
Check the media stream for correct media-air
mixture; media flow should be smooth and appear as a
light mist coming from the nozzle.
5.3.2
If media does not flow smoothly, loosen the
locking nut and adjust the metering screw until the upper
holes in the metering stem are closed off and the lower
holes are fully open, as shown in Figure 18. This
adjustment is a starting point.
Figure 18
5.3.3
If pulsation occurs in the media hose, either
media is damp and caked, or not enough air is entering
the media stream. While blasting, loosen the locking nut
and
slowly
turn
the
adjusting
screw
out
(counterclockwise when viewed from the top) until media
flows smoothly. Tighten the locking nut finger-tight to
maintain the setting.
5.3.4
If media flow is too light, decrease air in the
mixture by turning the metering screw in (clockwise
when viewed from the top), covering more of the holes
so less air enters the media hose. Tighten the locking
nut finger-tight to maintain the setting.
5.4
Reclaimer Static Pressure (dust-collector
outlet damper)
5.4.1
Correct static pressure varies with size of
reclaimer, and the size, weight, and type of media.
5.4.2
Adjust static pressure by opening (handle in-line
with air flow) or closing (handle perpendicular to air flow)
the dust-collector damper. Refer to the dust-collector
owner’s manual; the damper is located on the inlet on
CDC-1 Dust Collectors and on the exhauster outlet on
RPC-2 and RPH2Dust Collectors. If the damper is not
opened far enough, the reclaimer will not remove fines,
resulting in dusty media and 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.
5.4.3
A manometer is useful when adjusting or
monitoring static pressure. The manometer kit is listed in
Section 9.1:
Optional Accessories
. Refer to Section 5.8
for manometer operation. The following are static-
pressure starting points for given media. Static pressure
may need to be lower with finer media, higher with
coarser media. Run the media through several blast
cycles, allowing the reclaimer to function with these
settings. Inspect the media in the reclaimer and fines in
the dust collector, as noted in Paragraph 5.4.2. Continue
adjusting static pressure until optimum dust and fines
removal without carryover is attained.
Glass Bead No. 4 to 7 .................................... 3" – 3-1/2"
Glass Bead No. 8 to 13 ................................... 2-1/2" – 3"
Aluminum Oxide, 60-mesh & coarser ................... 4" – 5"
Aluminum Oxide, 80-mesh & finer .................. 2-1/2" – 3"
*Steel Grit, 50-mesh to 120-mesh ......................... 6" – 7"
*Steel Shot S-170 to S-70 ..................................... 6" – 7"
*Refer to Section 1.9 for media limitations.
5.4.4
If the damper has been adjusted and carryover
or excessive dust in the media continues, the optional
externally adjustable vortex cylinder, available for 600
and 900 reclaimers, may help by fine tuning media
separation. The vortex cylinder is usually required only
when using 180-mesh and finer media, or lightweight
media. Refer to Section 5.5.
Adjusting Screw
Lower holes fully open.
Locking Nut
Upper holes
fully closed.
Lock Nut
Air Jet
3-1/2 to 4 threads between
lock nut and air
jet hex.
