Remove lid to acid tank and fill with about 25 gallons of drinking water from fill hose attached to bib in void 2
port above holding tank.
Always add acid to water. Do not add water to acid. If any acid crystals or
solution splash on skin, flush skin with water Immediately. Immediately
flush eyes at eyewash station if acid crystals or solution splash in eyes.
Add two cans (14 lbs) of sulphamic acid to water in acid tank.
3-7.2.2 Acid flush
Turn valve CU3 to position A, ACID.
Turn valve CU5 to position B, ACID.
Open valve CU17. Make sure valve CU16 is open.
Turn function switch on control cabinet (Figure 3-4) to FLUSH.
Descale until all visible signs of scale are gone from anodes (cells), approximately 5 minutes, then turn
function switch to OFF.
Sump tank pump automatically empties sump tank. Level switch In sump
tank starts and stops sump pump.
Turn valve CU5 to position A, DRAIN, to allow solution to drain to sump tank.
Remove lid to acid tank to observe level of solution in tank.
Turn function switch on control cabinet (Figure 3-5) to FLUSH. Acid tank is now being emptied by circulating
When acid tank is empty, turn function switch to OFF.
Close valve CU17.
Replace lid on acid tank.
After descaling with acid, flush chlorination unit with seawater before
returning to normal operation.
Turn valve CU3 to position B, WATER, to allow seawater to flush out acid.
Turn valve CU5 to position A, DRAIN, to allow flushing seawater to drain to sump tank.
Turn function switch to FLUSH.
After flushing to remove acid for about 5 minutes, turn function switch on control cabinet (Figure 3-5) to
Return chlorination system to normal operation (paragraph 3-4).
3-8 Shutdown procedure
Shutdown procedure is for normal operation and short downtime. For
extended shutdown times, see Chapter 5, Storage.
Turn metering pump control MANUAUOFF/AUTO switch to OFF.
Stop metering pump by turning MAN/OFF/AUTO switch on metering pump motor controller (Figure 3-2) to