BNP
®
55 SUCTION BLAST CABINET
Page 5
© 2019 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 23350, Rev G, 02/19
pressure, media-air mixture, visibility inside the cabinet,
humidity, and reclaimer cleaning rate.
Several variables that affect the reclaimer cleaning rate
include reclaimer size (cfm), contamination of parts
being blasted, media friability, damper setting (static
pressure), and dust-collector filter loading (differential
pressure across the dust filters).
As a rule, larger orifice air jets and nozzles deliver more
media, requiring higher performance from the reclaimer.
When using larger nozzles, the maximum mesh size of
media will be smaller than normally recommended.
Using media finer than those recommended may
decrease visibility and, at some point, carry over to the
dust collector. Media coarser than those recommended
may be too dense for the reclaimer to recover from the
cabinet hopper.
1.9.2 Steel shot and steel grit:
Steel grit or shot are
too heavy to use in BNP-55 Cabinets.
1.9.3 Sand and slag:
Sand and slag media are not
suitable for cabinet use. Sand should NEVER be used
for abrasive blasting because of the respiratory hazards
associated with media containing free silica. Slags are
not recommended for cabinet use because they rapidly
break down and are not recyclable.
1.9.4 Silicon carbide, aluminum oxide, and garnet:
These are the most aggressive of the commonly used
media.
Aggressive media may be used, but the service
life of any components exposed to the media will be
reduced. To avoid unscheduled downtime and maximize
cabinet life, periodically inspect the reclaimer wear plate,
blast hose, and nozzle for wear and replace parts as
needed.
When using aggressive media only occasionally, install
an optional aluminum oxide kit, which includes rubber
curtains for the cabinet interior and a boron carbide-
lined nozzle. When using aggressive media on a regular
basis, install the aluminum oxide kit and a fully rubber-
lined reclaimer. Rubber-liners are not available for 300
cfm reclaimers. Liners for 600 cfm reclaimers can be
factory-installed items, or field-installed later on
reclaimers if they have removable tops and are
designed to accept liners. Nozzles lined with boron
carbide extend nozzle wear life. Refer to
Section 9.3:
BNP Gun and Feed Assembly
.
1.9.5 Glass bead:
Most beads are treated to ensure
free-flow operation, even in environments of moderately
high humidity. Glass beads subjected to excessive
moisture may be reused only after thoroughly drying and
breaking up of any clumps.
1.9.6 Lightweight and fine-mesh media:
When
using lightweight (such as agricultural) media or fine-
mesh (180-mesh and finer) media, the reclaimer inlet
baffle may need to be removed to retain media and
avoid carry over. On 600 cfm reclaimers with bolt-on
removable tops, baffle removal and replacement is
easily accomplished, as explained in Section 7.10.
Reclaimers with welded-on tops require grinding to
remove the baffle, and once it is removed, it cannot be
replaced.
1.9.7 Plastic media:
Plastic and similar lightweight
and/or nonaggressive media are generally not
recommended for suction-style cabinets because the
lower blast velocity of suction blasting combined with the
softer and lighter weight media do not provide the media
impact for productive blasting. Best performance from
plastic media is achieved with pressure blasting,
requiring a pressure vessel with a 60-degree conical
bottom. Refer to Clemco’s AEROLYTE cabinet line.
This table offers a guideline to media type and selection based on standard 5/32" orifice air jet with 5/16" nozzle and
average conditions, such as air pressure, media-air mixture, visibility, contamination of parts being cleaned, humidity,
media friability, reclaimer cleaning rate, etc. As a rule, larger nozzles deliver more media, requiring higher performance
from the reclaimer. Larger air jets and nozzles decrease the maximum mesh size of media from those recommended.
Media that is finer than those recommended may decrease visibility and increase carry over to the dust collector. Media
coarser than those recommended may be too dense for the reclaimer to recover from the cabinet hopper.
MEDIA TYPE
RECLAIMER SIZE
STEEL GRIT STEEL SHOT
GLASS BEAD
ALUM. OXIDE
FINE MESH
LIGHT WT.
*300 cfm w/4" inlet
Do not use
Do not use
No. 6 to No. 12
60 to 180-mesh
See 1.9.6
See 1.9.7
*600 cfm w/5" inlet
Do not use
Do not use
No. 6 to No. 12 54 to 180-mesh
See 1.9.6
See 1.9.7
* Standard reclaimer inlets
Figure 3
