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 foam flush valve and observing air
pressure escaping from air line, when foam flush control valve is activated. Air will escape
from blue air line when FOAM FLUSH switch is put to ON position, and escape from red
air line when FOAM FLUSH switch is put to OFF position. System air pressure may drop
below 85 psi (586 kPa) during this procedure.
Disconnect air lines at foam flush valve. While an assistant puts pump operator's panel
FOAM FLUSH switch to ON and OFF positions (WP 0004), check if air pressure is
present at foam flush valve.
If there is air pressure, replace foam flush valve (WP 0289).