c. Cleaning. Remove dirt and rust from discharge pipe, plug, and adapter.
d. Inspec tion. Inspect discharge pipe, plug, and adapter for stripped or damaged threads.
(1) Replace damaged or unserviceable discharge tube, plug, reducing adapter, and pipe fittings.
(2) Replace damaged or unserviceable automatic pressure relief valve assembly.
f. Installation. (Figure 2-93)
Pipe unions are not tightened until relief valve is installed. Apply
Teflon tape to pipe threads before making connections.
(1) Install reducing adapter (4) in pipe tee (7).
(2) Install relief valve (3) in reducing adapter (4).
(3) Install elbow (6) on automatic pressure relief valve (3).
(4) Install adapter (5) in elbow (6).
(5) Install plug (2) in relief valve (3).
(6) Connect discharge pipe coupling nut (1) to adapter (5).
(7) Perform operational check.
2-79. RUPTURE DISC ASSEMBLY.
a. General. The rupture disc assembly IS a safety device which prevents progressive pressure buildup in the
R.O. vessels. It is located between the R.O. pump and the pulse dampener. The rupture disc opens (ruptures) at
1425 psi (100 kg/cm2). This paragraph describes removal, cleaning, inspection, repair, and installation of the
rupture disc assembly.
b. Removal. (Figure 2-94)
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 may occur. Be sure to open all drains and vents
before beginning any disassembly.
(1) Remove rupture disc assembly (6) from bushing (5).
(2) Remove bushing (5) from pipe.
(3) Unscrew cap (1) from body (2).
(4) Remove spacer (3) and rupture disc (4) from body (2).
(1) Clean pipe and surrounding area with brush and soap solution.
(2) Clean all parts of rupture disc assembly.
(3) Clean all threads.
(4) Particular attention should be paid to rupture disc and rupture disc seating surface.