13-4. R.O. ELEMENT REPLACEMENT cont.
Remove R.O. Pressure Tube End Caps. Refer to figure 3-1.
When removing end caps from more than one R.O. pressure tube, mark end caps with pencil
or chalk to ensure they are replaced on correct pressure tube and correct end.
To reduce chances of leaks, mark end caps and R.O. tube (alinement marks) with chalk or
pencil so that end caps are installed in the same position.
Shutdown ROWPU and relieve all pressure before removing or loosening any parts on the R.O.
To aid movement of piping during end cap removal, remove forward end caps first.
Replacement of R.O. elements in one R.O. pressure tube is shown. Replacement R.O.
elements in other R.O. tubes is similar.
Loosen hose clamp (1) and disconnect hose (2) from adapter (3).
Remove two nuts (4), bolts (5), clamp halves (6),and gasket (7) from elbow/piping (8).
Swing elbow/piping (8) away from end cap (1).
Remove ten nuts (9) and flat washers (10) from studs (11).
Use extreme caution when separating end cap from vessel. R.O. tube studs and seal are easily
damaged. Do not attempt to pry end cap from pressure tube with a screwdriver. Pressure tube
and end cap will be damaged.
Screw four end cap puller bolts (12) (from storage chest) into threaded holes in end cap (13). Turn puller
bolts alternately until end cap is separated from R.O. pressure tube (14). Slowly, separate end cap from
R.O. pressure tube.
Repeat steps (1) through (5) for opposite end cap (13).