24
CORROSION INHIBITOR
The storage tank must be treated to prevent corrosion. The system has either been supplied with the
amount of preparation chemicals and corrosion inhibitor required or alternatively can be sourced locally.
These are to be applied in accordance with the manufacturers’ instructions. Refer to SDS sheets supplied
with pre-treatment and corrosion inhibitor.
Corrosion inhibitor must be used and maintained in accordance with this instruction in order for the storage
tank to be covered by the warranty.
The following chemical treatment is recommended for optimum protection.
Pre-treatment with NALPREP® IV
Corrosion Inhibitor TRASAR
TM
TRAC107PLUS
Refer to Material Safety Data Sheet supplied with product for safe use and disposal of these products.
Warning:
Protective overalls, rubber or nitrile gloves and chemical splash goggles must be worn.
TREATING THE STORAGE TANK
1. Remove the plug from an unused fitting on a storage tank, preferably at the lowest point.
2. Using a funnel, pour Nalprep IV at a dose of 2.7L per 1000L of total storage tank volume into the
storage tank.
3. Add 15% of the weight of Nalprep IV of sulphuric acid (30%w/w) to the storage tank. This ratio can be
factored if different strengths of sulphuric acid are used. This is required to lower the pH of the water to
6.5
– 6.7.
4. Re-fit the plug on the tank.
5. Fill the system with clean water. Refer to Filling and Testing of Primary Circuit on page 25 for the
method to fill and pressure test the system and follow that procedure fully before returning to point (5)
below.
6. Once the system is filled and pressure tested with no leaks, ensure that the entire primary circuit is
open to water-flow (no isolated dead-legs) and circulate under no load (ie ambient water temperature).
7. Circulate for an absolute minimum of 8 hours, preferably 8-12 hours or overnight. During this time any
strainers should be checked for blockage and cleaned.
8. Drain the system. First release the pressure by gently releasing the lever on the TPR Valve. Observe
the pressure gauge and wait until pressure is completely released.
9. Open the air bleed valve and
the drain fitting ‘R’ on each storage tank.
10. When completely drained, close the drain/s.
11. Add TRAC107PLUS to one of the storage tanks at a dose of 2 to 3L per 1000L of total storage tank
volume. Refit the plug and refill the system with clean water.
12. When water begins to flow from the air bleed valve, close the water supply isolation valve and close the
air bleed valve.
13. Close the isolation valve at the inlet and outlet of the Solar Pump Skid and remove the pressure gauge.
Cap the gauge spigot and reopen the Solar Pump Skid inlet isolation valve.
14. Unless connected to an auto fill valve and the incoming pressure is
as described on page
12, remove
the mains water supply from the system.
