MEDIPULSE 2342se ERGONOMIC SUCTION BLAST CABINET
Page 4
© 2019
CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 24939, Rev. C, 03/19
1.7
HEPA (high-efficiency particulate air)
Filter
1.7.1
Optional HEPA afterfilter provides additional
filtration. A HEPA filter must be used when removing
toxic coatings, heavy metals, or any other toxic
materials. HEPA filter is listed in
Section 9.1: Optional
Accessories
.
WARNING
All dust is hazardous to breath.
Emissions can
occur from the dust collection system. Identify
all materials that are to be removed by blasting;
if any toxic materials such as lead dust or dust
from other heavy metals and corrosives, or any
other toxic materials are being removed, use a
HEPA afterfilter to assist in maintaining
inhalation hazards below the permissible
exposure limits (PELs). Prolonged exposure to
any dust can result in serious lung disease and
death. Short-term ingestion of toxic materials
can cause serious respiratory injury or death.
Filtration may not be adequate in reducing all
inhalation hazards. It remains the employer’s or
user’s responsibility to ensure all emissions are
safe to breath.
1.8
Blasting Media
1.8.1
Always use media specifically manufactured for
blasting and that are compatible with the surface being
blasted. Media produced for other applications may be
inconsistent in size and shape, contain particles that
could plug the nozzle or media metering valve, or cause
irregular wear. Always obtain the safety data sheet
(SDS) for the blasting media prior to blasting and identify
material being removed by blasting, paying particular
attention to worker health risks and presence of any
hazardous/toxic substances.
Most common reusable media specifically manufactured
for blasting can be used in the MediPulse cabinet. The
listing of media sizes shown in this section are provided
as a guideline only. The guideline is based on standard
5/32" orifice air jet with 5/16" nozzle and average
conditions, with variables such as blast 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.
1.8.2 Steel shot and steel grit
Steel grit or shot
should not be used with the MediPulse cabinet. Steel is
too heavy to use with cabinets equipped with 300 cfm
reclaimers.
1.8.3 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.
1.8.4 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, install an optional
aluminum oxide kit, which includes rubber curtains for the
cabinet interior and a boron carbide-lined nozzle.
Nozzles lined with boron carbide extend nozzle wear life.
Refer to
Section 9.2: BNP Gun and Feed Assembly.
1.8.5 Glass bead:
No. 6 to No. 12 glass bead are
recommended for the MediPulse. 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 any clumps.
1.8.6 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.
1.8.7 Bicarbonate of soda:
Bicarbonate of soda is
not recommended for use in standard cabinets. Bicarb is
a one-use media, which will quickly saturate the filter
cartridge(s). Best performance from bicarb media is
achieved with pressure blasting, requiring a pressure
vessel. Refer to Clemco’s Aerolyte cabinet line for
cabinets that are specifically designed for use with
bicarbonate of soda.
