16
FAULT FINDING
SYMPTOM
POSSIBLE PROBLEM
REMEDY
Air Blast but No Abrasive
(with water flow)
The pot is empty
Refill
Thompson valve isolation ball valve is
closed
Open
The abrasive in the pot is wet
(Moisture can enter in vapor form
with the compressed air - this is not
uncommon depending on air quality) *
Try closing the choke valve until some
abrasive is pumped out. Operating
the unit in the "choked" condition
will allow the use of media that
is too damp to flow properly, but
it greatly accelerates wear in the
metering valve. Continuous running
in the “choked" position also reduces
productivity and therefore should be
avoided
The remote abrasive control valve is
faulty
Inspect for dirt jamming the internal
shuttle valve
Foreign matter is plugging the
abrasive metering valve
Try closing the choke valve &
opening the abrasive metering valve
momentarily to see if that will blow
the obstruction out. If this does not
work then it will be necessary to
depressurize the pot & remove the
obstruction by hand
Pop up valve/handway leak - worn or
out of alignment with seal
Check and rectify
Air control line leak
Ensure all fittings are tight and there
are no holes, cuts, kinks, or abrasions
in air lines
Worn out exhaust ball valve
Check and rectify
Unit turns on
accidentally
The deadman is faulty
Repair or replace
Deadman control valve is faulty
Repair or replace
Air Blast with
Abrasive but no
Water
Water not turned on
Turn on
Needle valve closed
Open
Pump pressure regulator set too low
Raise to 50 p.s.i. on gauge
Air actuated valve failure
Check and rectify
Needle valve blocked
Remove and clean
Water filter blocked
Remove and replace
Pump failure
Repair or replace
