Figure 3-14. RO Cap Head
k. Pull cap head assembly (6) out of RO vessel (11) by grasping the cap head pipes and rocking the head up and down
until it slides out.
Occasionally, after a long period of service, the cap heads may be very difficult to
remove. Perform step l.
l. Install clamp (6, Figure 3-15)on port (9) and use wood block as a pry bar to loosen the cap head assembly by prying
against clamp and edge of vessel.
m. Remove seal (9, Figure 3-14) from cap head assembly (6).
n. Remove connector (8).
o. Remove two preformed packings (7) from connector (8).
p. Remove preformed packing (10) from inside diameter of cap head assembly (6).
q. Repeat procedure h thru p for remaining three RO vessels (11).
r. Move inside the van at chemical tank end of RO vessels. Tag piping (8, Figure 3-1 5) and drain tubes (2) to ensure
s. Loosen nuts (1, Figure 3-15) from drain valves (3). Remove the drain tube (2).
t. Remove the four nuts (4) and capscrews (5) from two clamps (6)of upper vessel. Remove the clamps and gasket (7).
u. Repeat step t for lower RO vessels.
v. Disconnect RO piping (8) from RO vessels and move piping out of the way of RO vessel end.
w. Remove the four cap head assemblies at this (chemical tanks) end of the RO vessels using the same procedures
as described in steps h thru q above.