We offer Hot Dipped Galvanized pressed steel sectional tanks manufactured following the British Standards. The system is simple and yet cost effective and requires a very short time for installation. It is currently the most popular bulk storage system for water in the industrial, commercial as well as residential sectors in all over the world. It is very useful for awkward and difficult locations unsuitable to other forms of bulk storage system. The size of the tank can be readily enlarged by merely adding new panels.
Our pressed steel sectional tanks are assembled by bolting together the side plates, partition plates ( where applicable ) and base plates. Angle stays fixed to cleats or gussets, which in turn are bolted to the side and base plates, obtain rigidity of the tank. The seams of the tanks are sealed with Either (Ethylene Vinyl Acetate plus Natural Rubber) sealant tape or non-toxic and flavorless jointing compound. With proper maintenance, the tanks have a life span of 15-20 years.
We also have a complete range of accessories like water level indicators, internal and external cat ladders, tank covers, valves and pipe fittings. Our services also include installation works, maintenance, designing and construction of relevant foundation and structural supports.
When a constant pressure head of water is required for supply purposes, tanks are mounted on a steel tower at a suitable height. We design our tower with a suitable seismic and wind loads to relevant British standards.
In order to choose the most suitable depth of tank for a given capacity at a known height, consideration must be given to pumping against a variable head and the pressure variations in the delivery main, both of which should be kept to a minimum.
The design and construction of tank supports and foundations is critical and should only be undertaken and supervised by competent professionals. Full information on the soil conditions is essential.
– Ground Level Tanks:
In steel water tanks with internal bracing the side wall pressure applied by the water is converted to downward forces in tank side walls. Maximum loads which can be considerable occur around the perimeter of the tank.
Ground level tanks are commonly supported on reinforced concrete dwarf walls. Care should be taken to ensure that foundations walls are parallel and square to each other. Foundation walls must protrude beyond the edge of the tank by a recommended distance of 150 mm. The tapered top section of wall assists in providing access for tools to fasten the tank panel flange bolts. In sloping or rocky situations where earthwork costs are significant steel beams mounted on concrete bases are often an economically viable alternative.
– Elevated Tanks:
Elevated tanks are commonly founded on concrete bases with stub columns cast into excavations which are back filled after construction. The determining loads in elevated tank foundation design are dependent on the height of the tower. The determining load for low level tanks is the down thrust and thus foundation size is governed by the soil bearing pressure. The determining load for high level tanks will be the up lift and thus the anchor effect of foundation and back fill mass will determine foundation size. Maximum up lift occurs when the tank is empty. Aquawetts enterprises limited supplies full foundation information for each elevated tank purchased to its design.
– Load Terminology:
- Dead load – the load created by the mass of the steel tower and empty tank
- Live load – the load created by the mass off the water stored.
- Wind load – the vertical loads (uplift & down thrust) created by the over tuning effect of wind pressure on the tank and support tower.
- Surge load – the vertical loads similar to wind load created by surging as the tower sways under wind load.
- Shear – To be resisted by foundation bolts.
- Uplift – To be resisted by foundation bolts – Mass of concrete foundation & back fill material – Must anchor the structure to prevent overturning.
- Down Thrust – To be resisted by soil bearing pressure.