AXXIOM Manufacturing, Inc. SCHMIDT, Operation And Maintenance Manual

Page: 53 / 60

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© 2013 Axxiom Manufacturing, Inc.
Figure 11.1 – Mini Abrasive Blaster with pneumatic blast controls
11.2 Malfunction With Deadman Lever In The “On” Position
11.2.1. Air blasts with no abrasive
(1) Check abrasive level in blast vessel (even if optional second outlet blasts normally).
(2) Blocked control air hose to Thompson Valve® (#14) prevents opening.
(3) Thompson Valve (#14) plunger stuck in closed position.
(4) Trash plugging opening from tank to Thompson Valve (#14). See Section 11.3.
(5) Insufficient air pressure to open Thompson Valve (fully open requires 80 psig).
(6) Abrasive flow problems. See Section 11.3.
(7) Defective Thompson Valve piston seal (air will leak from breather).
(8) Blast vessel leak (popup or handway) reduces pressure slowing abrasive flow.
11.2.2. Abrasive choking out of blast hose with low blast air pressure
(1) Thompson Valve (#14) abrasive adjustment knob is open too far.
(2) Control air hose to automatic air valve (#9) blocked, pinched, or leaking prevents opening.
(3) Choke valve (#13) is partially closed causes differential pressure increases abrasive flow.
(4) Low air compressor output cfm (unit may cycle on and off). See Section 3.0.
(5) Blocked automatic air valve (#9) breather vent (#21) prevents full opening.
11.2.3. Reduced Pressure At The Nozzle (with or without abrasive flow)
(1) Low air compressor output CFM. See Section 3.0 to determine air requirements.
(2) Air supply hose to blaster is too small. See Section 3.0.
(3) Thompson Valve abrasive adjustment knob (#14) is open too far.
(4) Check for leaks in blast vessel (popup or handway) or control piping.
(5) Choke valve (#13) is partially closed.
(6) Trash may be partially plugging the nozzle orifice (#11).
(7) Blocked automatic air valve (#9) breather vent (#21) prevents full opening.