Read seawater temperature at temperature gauge T1 Determine how long seawater pump should operate by
using table below.
at T1 (F)
60 or less
2 hours 40 minutes.
2 hours 20 minutes.
1 hour 40 minutes.
1 hour 30 minutes.
1 hour 20 minutes.
90 or more
1 hour 10 minutes.
After allotted time, stop seawater pump.
Close valves RO13 and R014.
Open valve RO12 and close RO19.
Open seawater valve SW9 for ROWPU 1 or SW10 for ROWPU 2.
Start seawater pump to flush RO block.
After flushing with seawater for 30 minutes, take a water sample at valve RO17 Using a water testing kJt,
check sample for pH according to TM 5-6630-215-12 If pH is not acceptable, flush RO block membranes for
30 minutes more and test again. Continue flushing until water is acceptable (pH 7).
Stop seawater pump.
Prepare ROWPU for normal operation (paragraph 3-4).
4-7.4.3 Membrane cleaning agent drum replacement.
Wear safety goggles or faceshield and rubber gloves while replacing cleaning agent drum.
Immediately wash off agent that contacts skin. If agent touches eyes, Immediately flush eyes at
eye wash station. Wash spills with water. Dry mop to prevent slipping.
Close valve R013 on hose connected to large threaded drum bunghole.
Disconnect hose containing valve RO13
Close valve RO14 on hose connected to small threaded drum bunghole.
Disconnect hose containing valve RO14.
Tip drum from vertical position and remove used drum using drum lifter and bridge crane with 2-ton hoist.
Ensure that correct drum is removed and replaced.
Obtain new drum using drum lifter and bridge crane with 2-ton hoist.