a. Spray or brush on soap and water solution and check for leaks on the following parts: (Bubbles will form when
there are leaks.)
(1) All tubing, valves and fittings at both air manifolds (para. 4-68).
(2) All tubing and fittings at both air dryers (para. 4-67).
(3) The regulator, flowmeter and fittings on the turbidity meter panel (para. 4-49 and 4-50).
(4) Tubing and fittings all three solenoid valves (para. 4-51).
(5) Air tubing connections and tubing on the media filter (para. 4-53).
(6) Air tubing connections and tubing on the media filter air blanket level indicator (para. 4-52).
(7) Tubing and fittings going to the safety valve (para. 4-58).
(8) Tubing and fittings to butterfly valve actuators (Figure 4-26, View B).
b. Check for damaged tubing by having everything quiet and listen for air leaks or by moving the back of your hand
over tube line.
Make certain in-line pressure is relieved from hoses. Failure to do so could result in
injury. Close the air storage tank block valve and open the vents on both air manifolds
to relieve air pressure before performing any maintenance.
a. Metallic air tube fittings (Figure 4-26, View A).
(1) Loosen nuts (1).
(2) Remove tubing (2) with assembled nut (1) and compression fitting (3) from air fitting component.
(3) Remove compression fittings from tubing.
(4) Remove tubing assembly (1, 2 and 3) by cutting ties which secure it to wails and/or ceiling (para. 4-10).
b. Butterfly valve actuator tube fittings (Figure 4-26, View B).
(1) Push in on fitting (5) and pull out on tubing (4).
(2) Cut any wire ties securing tubing (4) to walls or ceiling and remove tubing (para. 4-10).
c. Plastic air tube fitting (Figure 4-26, View C).
(1) Loosen nuts (6).
(2) Remove tubing (7) with assembled preformed packing (8), spacer (9) and grab ring (10). Disassemble compo-
nents from adapter.
(3) Remove tubing by cutting ties which secure it to walls and/or ceiling (para. 4-10).
If butterfly valve actuator fitting is leaking at the point marked Push Here in Figure
4-26, remove tubing from fitting and cutoff about 1/4 inch of the tubing. Remove any
burrs on fitting. Reinsert the tubing in fitting making sure that it enters straight into
the fitting without being strained to the side.
a. Remove old antiseize tape and install new antiseize tape on fittings.
b. Replace any damaged fittings or valves (see individual component procedures).
c. Replace damaged tubing. Tube fittings must also be replced because ferrules are not reusable.
d. Replace damaged or missing tube markers (para. 4-10).
e. Replace damaged or missing tie mounts (para. 4-10).