(Revised NOV.
2024)
SMC WATER TANK TESTING MANUAL
HAYOUNG SMC INC
1. Cleaning of the Interior/Exterior of Tank
A. Cleaning Inside
1. As the Tank is used for storing drinking water, take out bolts, nuts, washers, and any other
remaining items, and clean the tank with a soft detergent.
2. When cleaning, be careful that no foreign substances come through the drain.
B. Cleaning Outside
1. Remove bolts, nuts and washers around the tank.
2. Take away any trash that remains from the assembly process.
3. Put tools in a designated place and clean the surroundings.
2. Watertight Test
How to do watertight test
1. In case the piping work is done by the building
facility side, close the Drain Valve and the Outlet
Valve, and fill with water.
2. At this time, fill the water level of tank to
250～300mm from the ceiling flange surface as in
the Figure.
3. Wipe clean the outside of the tank to ensure there
Fig 13-a
is no trace of wetness.
4. Carefully survey the flange, panel surface, bottom
surface, and corner.
5. Fill 1m height each 6 hours water; the leakage test must be done during the day in full sun. Avoid
rainy or snowy days for testing. Once the filling is complete, keep it under observation for 24-48
hours.
6. In a basement or a building, lighting will be needed to see any water leaks.
7. Mark any leaking areas with a red pencil, determine the cause of the leak and take the
appropriate action.
3. Action for Water Leakage
1. If there is a leak, determine the cause, and take one of the following actions
Cause Action to be taken Remark
1. Poor 1. Check the fastening status of nut at the leaking section,
fastening of fasten completely with a ratchet.
See Fig. 16-b
Bolt, Nut 2. If a weak bolt has been broken during assembly by the
fastening nut, it may cause leakage; change the bolt.
1. Bolting where the washer or foreign matter enters the gap When working with
2. Entry of of the flange sealing tape may cause leakage. If water is silicon, c u r i n g t i m e
foreign matter leaking extensively, dismantling and reassembly will be is needed; fill water
into Sealing necessary. after 2 4 h o u r s
o f
part 2. If for minor leaks, treat with silicon caulk. curing.
Silicon must be applied when the tank is completely dry.
3. Leakage at 1. Leaks may occur at the crack of the corners of the SMC
crack of Panel Panel or pin hole. Drain the water in the Tank and treat See Fig. 16-d
and Pin Hole section with silicon.
- 24 -
2. Bolt Rupture
Although the Bolt and Nut appear to be fastened, the interior may be broken. When the tank is filled
with water, leaks can occur due to the water pressure.
Even if a bolt is locked,
sand, washer or foreign
Rupture matter in the seal between
the panels may cause water
to leak from the gap.
Fig 13-c
Silicone
Fig 13-b
Pinhole
Fig 13-d
Fig 13-e
