When basket strainer is blocked or needs cleaning, the basket strainer pressure drop sensor will turn on
warning horn and yellow STRAINER PLUGGED light (1, Figure 3-9.1).
Model ROWPU-1 of the ROWPU is equipped with a dual strainer system to allow one strainer to be
replaced without shutting down the system. The following procedure describes the replacement of one
strainer. The procedure for removing the strainers are similar.
If strainer (2) is being replaced, open manual valve (4) and close manual valve (3). If strainer (5) is being
replaced, open manual valve (3) and close manual valve (4).
Remove clamp (6), gasket (6A), clamp (7), pipe section (8), gasket (16), and clamp (9).
Lift out basket strainer assembly (10) from strainer vessel (11).
Twist off cap (12) and remove seal (13A) and gasket (13).
Remove outer strainer (14).
Check condition of O-ring (15) and seal (13A).
Check condition of gaskets (6A), (13), (16), and (17).
Replace gasket (6A), (13), (16), and (17) if cut or damaged.
Replace seal (13A) or O-ring (15) if cut or damaged.
Install O-ring (15), gasket (17), outer strainer (14), gasket (13), and seal (13A) on inner strainer (18) and secure
with cap (12).
Insert strainer assembly (10) into the basket strainer vessel (11) and install clamp (9).
Install pipe section (8), gasket (16), clamp (7), gasket (6A), and clamp (6).
Clean dirty outer strainer with platers brush for next change-over. If strainer is torn or otherwise damaged, notify
unit maintenance for replacement.
3-48.2 Change 7