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 Ibs) of sulphamic acid to water in acid tank
9-15.2.2 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 9-9) to FLUSH.
Descale until all visible signs of scale are gone from anodes (cells), approximately 5 minutes, then turn function
switch to OFF/RESET.
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 9-9) to FLUSH. Acid tank is now being emptied by circulating
When acid tank is empty, turn function switch to OFF/RESET.
Close valve CU17.
Replace lid on acid tank.
After descaling with acid, flush chlorination unit with seawater before returning to
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 9-9) to
Return chlorination system to normal operation (paragraph 9-12).