Double skin underground storage tanks have an internal shell manufactured from 6mm steel and an external shell manufactured from
4mm steel. The dished ends are 6mm thick. They are supplied with 600mm diameter manlid with double tapered sockets and flexible
iron plugs.
Also available as standard is a 1.2m² access chamber frame, nylon ratchet holding down straps, brass calibrated dip rod, lifting
lugs and a polypropylene glycol and water mix in the interstitial space between the two skins.
The standard paint finish for double skin underground storage tanks is Black Bitumen, with the option of Polyurethane or Two-Coat
Epoxy. A heavy duty ground level manhole cover and frame (760mm x 610mm) and multi-compartment tanks are available as optional extras.
A LAG14er leak detection system kit is also available if required.
Installation
Having decided on a tank to meet your requirements a pit is excavated of suitable size and location. The base is a slab constructed
of 150mm reinforced concrete and extends 300mm minimum outside the tank line. Concrete retainer walls may be constructed if needed.
The tank is lifted into position and secured with holding-down straps, making sure that the tank is level both vertically and
horizontally. The tank must be encased with pea gravel, washed sand, urea amino plastic foam (or concrete, subject to draft code
of practice 2000 exclusion) to a depth of 150mm excluding the manhole lid. The pipe work contractor now completes the installation.
The manhole chamber is completed and the surrounding area is topped up with hard core and a reinforced concrete slab at ground level
is poured.
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