Installing the DURATANK Tank Liner Underday

If you are using a geotextile protection underlay (highly recommended) it will be supplied in two pieces, a base and a wall section. The base is simply placed on the floor as evenly as possible. The wall underlay will then be temporarily hung in place until the tank liner is installed.

Hang the geotextile protection underlay along the wall in four different places (best to use non-permanent fixing, such as heavy duty tape); this can be done by using the 3, 6, 9 and 12 o’clock positions or in the 4 corners for square or rectangular tanks.

For open top tanks, hang the liner over the edge. It is often a good idea to drill all of the fixings positions prior to hanging the liner. (Ensure all drill swarfetc is removed before hanging geotextile and liner). Do not worry about the rest of the geotextile wall as this can be hung at the same time as hanging the liner wall. If you do pre-drill all of the fixing locations for hanging the liner, make sure that there is a gap of at least 200mm between each fixing location.

The wall underlay will also overlap the base underlay by a small amount. You can tape any excess floor geotextile to the wall and overlap any excess material from the wall and or floor.

Put pressure on the geotextile adjacent to any hazards to make sure none of the hazards penetrate the geotextile. If the hazard pierces or is likely to pierce the geotextile, remove the puncture point.

Securing The New Liner

There are two ways to secure the tank liner installation, depending on the type of tank you have. With open top tanks, the liner is folded over the edge by about 150 mm and secured around the outside with wire (in the case of corrugated tanks).

Carefully unroll the liner on the tank floor and open the liner up, making sure that the centre of the liner (marked with 300mm diameter circle) is exactly in the centre of the tank. Take care when unfolding the liner and ensure that you unfold each fold one at a time. Make sure that the wall to base seam (the welded seam that continuously goes all the way around the tank) is pushed up against the floor/wall juncture (where wall meets the floor of the tank).

SECURING A LINER IN A CLOSED TOP TANK – Diagram A

With closed top water tanks, the liner can be secured with rivets, self- tapping screws or concrete wall anchors, depending on the type of tank. Mount or screw through the webbing.

Start hanging the liner wall by using the same method as you used when hanging the geotextile on the wall the 12, 3, 6 and 9 o’clock positions or the four corners. Ensure that the wall section is hung vertically. Check to see that the pleats (folds) are hanging vertically. When you start to hang the rest of the wall, hold the geotextile underlay wall material behind the liner wall and attach both of them at the same time.

If the folds (pleats) on the tank liner wall are not vertical then the tank liner will have to be re-adjusted.

At NO POINT is the liner to be under any tension in any place. The liner is made oversize and should not be tight, taunt or under load at any point.

SECURING A LINER IN AN OPEN TOP TANK – Diagram B

Check both the inside of the tank as well as the rim of the outside of the tank for any sharp or protruding objects that can either damage or puncture your liner. The Geotextile protection underlay should help protect the liner as much as possible when it is dropped over the top of the tank.

Once the liner is inside the tank, unroll the liner and make sure the liner is in place by checking the perimeter wall to base seam is right in the wall to base join of the tank. Fold both your Geotextile protection underlay wall and your liner over the top of the tank, making sure that any wrinkles which appear on the liner wall during installation are eliminated (pull the liner wall against the wrinkles).