SECTION III. MAINTENANCE PROCEDURES
This section provides maintenance procedures to be performed by the operator.
CHANGING R.O. ELEMENTS.
General. The R.O. elements are replaced any time TDS of product water exceeds 1500 parts per million and
cannot be corrected by using procedures described in item 17, Table 3-2, Troubleshooting. Each R.O. vessel contains two
If removing end caps from more than one R.O. vessel, mark end caps with pencil or chalk to ensure they
are replaced on correct vessel and correct side.
Shutdown ROWPU and relieve all pressure before removing the R.O. element, or loosening any parts of
the R.O. pressure vessels.
Some steps require two people.
Shut the ROWPU down normally (para. 2-31).
Open all R.O. vents, drains, and valves (fig. 2-41 and 2-42).
Remove strainer and hose from water source.
To reduce chances of leaks, mark end caps and vessel (alignment marks) with chalk or pencil so that end
caps are installed in the same position.
1. Hose Clamp
10. End Cap
11. Puller Bolts
12. Pressure Tube
Figure 3-1. R.O. Vessel End Cap Assembly