18
PI-120
March 2020
5.3 Make sure that the air regulator is set correctly. The pressure should
be set for no lower than 80 psi and no higher than 120 psi while the gun
is in operation (not at rest). To set the proper air pressure, pull up on the
air regulator adjustment knob and turn clockwise for more air pressure
and counter-clockwise for less air pressure. Once the air pressure is set,
push down on the adjustment knob until it “clicks” and locks. See PI-121,
40K Multi-Mode Valve.
5.4 Check the Remote Control Valve for smooth and proper operation. DO
NOT use the Remote Control Valve if it has not been cleaned and in-
spected before the start of the working shift. See PI-121, 40K Multi-Mode
Valve.
5.5 Never operate the Tornado Gun if the Remote Control Valve does not
fully open and reduce the system pressure to near zero immediately when
its triggers are released. The control valve must relieve the water pres-
sure immediately to below 200 psi when the trigger/pedal is released.
5.6 Be sure the retaining nut is seated against the housing shoulder be-
fore operating (see WARNING on page 24). Attempting to run at pressure
with the nut backed off the shoulder will result in catastrophic seal failure.
5.7 Never operate the Tornado Gun without the hose support burst
shield. This supports the high pressure hose, acting as a strain relief
while providing coverage protection in case of a hose or fitting leak.
PROPER WATERBLAST TECHNIQUE
5.8 The gun operator must maintain firm solid footing to counter the
gun’s blasting reaction. This rearward reaction is usually 40 to 60 pounds
of force, depending on nozzle selection, pressure, and flow. Use fall pro-
tection when blasting on scaffolding or sloping surfaces. DO NOT operate
the gun while standing on slippery surfaces.
5.9 Check high pressure seal condition at start of shift and after every 2
hours of operation by pointing nozzles safely away from any target and
pulling both triggers. Operate the gun in this manner at 15,000 - 20,000
psi and at 40,000 psi while viewing the weep holes in the swivel nut
directly above the air drill. Any drips or leaks indicate a worn HP seal and