(11) (USMC) Install union (14) with pipe assembly (15).
(12) Install automatic pressure relief valve (2).
(13) Connect three pipe unions (1) to frame piping.
(14) Tighten four nuts (6).
(15) Perform operational test and check all fittings for leaks.
General. The drain valves have two purposes. They allow water to run out of the pipes and filters of the
ROWPU after the unit has been shut down, and they enable the operator to draw water samples while the unit is
working. This paragraph describes how to remove, clean, inspect, and install the drain valves.
Removal. (Figures 2-96 (ARMY) and 2-97 (USMC))
ROWPU piping and equipment can contain extremely high
pressure during and after operation. If this pressure is not
relieved before working on these pipes or equipment, serious
injury or death can occur. Be sure to open all drains and vents
before beginning any disassembly.
(1) Remove coupling nut (1) from adapter on valve (4).
(2) (ARMY) Remove two screws (2) and two lockwashers (3) from retaining strap (5) and valve (4).
(3) (ARMY) Remove two screws (6) and two lockwashers (7) from retaining strap (5).
(4) (ARMY) Remove retaining strap (5) and valve (4) from frame.
(5) (USMC) Remove two screws (3), two lockwashers (2), and valves (4) from frame.
(1) Remove dirt.
(2) Remove pitted and corroded material.
(3) Clean dirt and corrosion from bolts, screws, washers, pipe, and retaining strap.
(4) Remove burrs on pipe flare with steel wool.
(1) Inspect nut, screw, and bolt threads for damage.
(2) Check for bent or broken bolt stems.
(3) Check retaining strap for damage.
(4) Check flared pipe end for damage.
Repair or Replace.
(1) Replace damaged nuts, bolts, screws, and washers.
(2) Replace damaged or unserviceable retaining strap.
(3) Replace damaged pipe fittings and tube assembly.
(4) Replace damaged or unserviceable drain valve assembly.
(5) Send unserviceable drain valve assembly to Direct Support Maintenance.