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 DSA 3-suction 600mm diameter manlid with double tapered sockets and malleable 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. Refer to the product chart opposite for tank sizes and specifications. A LAG14er leak detection system kit is also available if required.
Single skin underground storage tanks are available on request.
DSA 3-Suction Man Lid
All Underground Storage Tank compartments are supplied with a 600mm diameter DSA manlid which includes:
- Three 50mm double tapered suction sockets with malleable iron plugs
- Three 100mm double tapered BSP sockets with plugs for fill, vent and gauge. Direct dip through fill socket.
- Each lid has one 76mm spare BSP socket and plug
Installation of underground steel storage tank
Underground steel storage tank on concrete slab base
Having decided on a tank farm 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 (Drawing A). Concrete retainer walls may be constructed. The tank is lifted into position and secured with holding down straps making sure that the tank is level both vertical and horizontal. The tank should now be filled with water. Following the supervised hydraulic test the tank can be back filled. The tank must be encased with pea gravel, washed sand, urea amino plastic foam (or concrete*) to a depth of 150mm excluding the manlid 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.
*Subject to draft code of practice 2000 exclusion.