Table 4-1. Unit Preventive Maintenance Checks and Services (Interval) Schedule
M - Monthly
Q - Quarterly
A - Annually
Item to be
Solution feed pump
lnspect for splitting, cracking, and dry rot.
Inspect for damaged threads,
Inspect for cracks, chipping, damaged gaskets, damaged bolts and
nuts, and damaged flanges.
Inspect for cracks, broken welds, and missing data plates.
Section IV. TROUBLESHOOTING
4-7. GENERAL. This manual cannot list all malfunctions that may occur, nor all tests of inspections and
corrective actions. If a malfunction is not listed or is not corrected by listed corrective actions, notify your
4-8. TROUBLESHOOTING TABLE. The troubleshooting table (table 4-2) lists the common malfunctions which
you may find during the operation or maintenance of the hypochlorination unit or its components. You should
perform the tests/inspections and corrective actions in the order listed.
Table 4-2. Unit Troubleshooting
Test or inspection
1. SOLUTION FEED PUMP AIRLOCKED AT STARTUP
Hypochlorite solution is toxic to skin and eyes. Wear skin
and eye protection to prevent personal injury.
Step 1. Check that check valves in solution feed pump suction hose and pump discharge hose are
Repair check valves. Refer to paragraph 4-24.