TEST OR INSPECTION
If air lines are under pressure when they are disconnected, they can whip around
and cause injury to personnel. Caution should be exercised when disconnecting
air line fittings.
Air lines may be under pressure when control valve is operated. If under pressure
and air lines are disconnected, air lines may whip around and cause injury to
personnel. Caution should be exercised when operating control valve with air lines
Air pressure is checked by disconnecting air lines at roof turret valve and observing air
pressure escaping from air lines when roof turret valve is activated. Air will escape from
blue air line when roof turret control discharge switch is pressed, and escape from red air
line when roof turret control discharge switch is released. System air pressure may drop
below 85 psi (586 kPa) during this procedure.
Disconnect air lines at roof turret valve. Push and release agent discharge button on
roof turret control handle (WP 0004), check if air pressure is present at roof turret valve.
If there is air pressure, replace roof turret valve (WP 0580).