TM 10-4610-240-10
TM 08580C-10/1
T.O. 40W4-13-21
Section III. MAINTENANCE PROCEDURES
3-3.
INTRODUCTION.
This section provides maintenance procedures to be performed by the operator.
3-4.
CHANGING R.O. ELEMENTS.
a. 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 16, table 3-2, Troubleshooting. Each R.O. vessel contains
two R.O. elements.
CAUTION
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 end.
To reduce chances of leaks, mark end caps and vessel (alinement marks) with chalk or pencil so that
end caps are installed in the same position.
CAUTION
Shutdown ROWPU and relieve all pressure before removing the R.O. elements, or loosening any
parts of the R.O. pressure vessels.
NOTE
Some steps require 2 people.
b. Pre-removal Procedures.
(1) Shut the ROWPU down normally (paragraph 2-14).
(2) Open all R.O. vents, drains, and valves.
3-16
