Schmidt AmphiBlast 120, Operation And Maintenance Manual

Page: 56 / 116

56
Copyright © 2019 Axxiom Manufacturing, Inc.
7.8 Blow Off Operation
7.8.1. Switch the mode selector (#47) to “BLAST MODE”.
7.8.2. Turn the water “Off” by pushing in the palm button on the water on/off palm button
control valve (#48)
7.8.3. Turn the abrasive cutoff valve or switch (#62) to the “OFF” position. See Figure 5.3.
7.8.4. With one hand grip the blast hose assembly (#10) and with the other hand press in the
deadman safety button. To begin blow off, aim the blast nozzle (#11) at the object to be
dried or cleaned, then firmly press down the deadman lever (#12). Air only will flow
into the blast hose and out of the blast nozzle (#11).
7.8.5. Turn the blast air pressure regulator knob (#44) to set the blast pressure gauge (#49) to
the desired blow off pressure. See Section 5.17 for procedure. Release the deadman
lever (#12) to stop blow off.
7.9 Ending the Blast Operation
Do not leave the abrasive blaster pressurized during long periods of no usage. Undetected air
leaks can cause costly wear damage to the pressure vessel (i.e. at abrasive inlet and manway)
7.9.1. Close the air inlet ball valve (#3). The ball valve is closed when the handle is fully
turned to the position shown in Figure 7.1 (handle perpendicular to body). The handle
tab will bottom against the ball valve body in the closed position.
Do not turn off the air compressor and allow the abrasive blaster air pressure to back
flow through the air supply system. Back flow will carry abrasive into the moisture trap
(#7) and contaminate the controls.
7.9.2. Completely open the drain ball valve (#8) at the bottom of the moisture trap (#7) to
allow all the accumulated moisture to be drained out. Close the ball valve after draining.
7.9.3. Completely depressurize the abrasive blast vessel (#1) by slowly opening the blowdown
ball valve (#4). See Section 6.2 for blowdown procedure.
Airborne particles and loud noise hazard from the blowdown exhaust air can cause
serious injury and loss of hearing. Wear approved eye and ear protection. Stay clear of
blowdown air path. DO NOT place hands or other body parts in the blowdown air path.
Make sure no personnel are in the blowdown air path.
Do Not leave the abrasive blaster pressurized during long periods of no usage. An undetected air
leak can cause costly damage to the pressure vessel at the manway or abrasive inlet.
7.9.4. For long periods of non-usage remove remaining blast abrasive from blast vessel to
minimize moisture contamination.
Steel abrasive left inside the blast vessel can be contaminated by moisture and solidify
inside causing costly damage.
7.9.5 Disconnect the water supply line from the unit, open snubber tank ball valve, and open
water priming ball valve at the pump to drain the water.
In cold weather, water must be drain to avoid freezing causing costly damage.