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Abeco Tanks (Pty) Ltd

Technical Information on our Tanks

Technical Information on our Tanks

Tank plates

Design: The water pressure applied to it determines the stress that a tank panel needs to withstand. Consequently the design panel thickness is solely dependant on the depth of the tank. The maximum depth of the standard tank is 4 panels (4.88m). Tanks 5 panels (6.1m) can be supplied.
The life span of a water tank is dependant on the effectiveness of the corrosion protection applied to the tank. The life span of hot dip galvanized tanks is almost entirely determined by the thickness of the zinc coating. The thickness of the steel has insignificant influence.

Dimensions:

Panels sizes are 1220 by 1220 mm. Three standard thickness’ are produced – 3 mm, 4.5 mm and 6 mm. Abeco recommends the thickness shown in the following table for optimum cost benefit effect. Tanks following this recommendation have stood the ultimate test – the test of time.
  • Maximum water pressure on panel (m head) 1.22 2.44 3.66 4.88
  • Panel thickness (mm) 3.0 3.0 4.5 4.5
Manufacture:

Abeco evaluated alternative methods of production, in particular hot pressing versus coldpressing and selected the optimum cost benefit method. Panels are cold pressed using high yield stress drawing quality steel. Bolt holes are punched in purpose built machines with fixed punches to ensure dimensional accuracy.

Roofs:

Individual roof sheets span 1.2 or 3 tank panels depending on the width of the tank. If the tank width is greater than 3 panels, roof sheets overlap each other. The edges of the roof sheets are bent up to provide an overlap designed for optimum sealing. Two alternative roof sheet configurations are available : 2.5mm thick 610mm wide or 1mm thick 305 mm wide. The 1mm alternative offers some cost saving.

Internal Members:

Standard tanks have internal bracing consisting of angle iron welded to base plates. Base plates are bolted to the tank panels. These items are jig assembled to ensure dimensional accuracy. Roofs are fixed to cold rolled lipped channel purlins supported by tubular posts.

Fasteners:

All bolts are high tensile grade.

Sealants:

All sealants and rubber components used are non toxic and non tainting. EPDM grade rubber gasket extrude with a profile specially developed to achieve optimum sealing, ease and speed of installation is used between tank panel flanges. Rubber bungs are used at specific points. Silicone and mastic are used in conjunction with rubber bungs and to seal bolts protruding through the tank.

Corrosion Protection
Tanks:


All steel components including bolts nuts and washers are hot dip galvanized. For storage of portable water at ambient temperature the durable life of hot galvanized tank can be expected to equal or exceed its economically useful life. Specialized coatings to specification can be applied for other applications.
Support Towers: Hot dip galvanized is recommended for optimum cost effectiveness.

Standard Accessories:
  • Caged external access ladder
  • Internal access ladder
  • Hinged lockable manhole
  • Float and pointer type water level indicator
  • Screened ventilator
  • Other accessories that can be supplied on request are: Valve boxes fixed to roof sheets to accommodate inlet float shut valves. Sump boxes welded into tank floor plates.
Pipe Connection Points:

Pipe connection points are positioned at points selected by the purchaser. Manufacture does not start until this information is supplied. Designers should take care in selecting pipe connection points to ensure that piping will not foul tank supports or internal members.

Standard fittings:
  • BSP sockets
  • Flanges to BS 4504 10 bar or SABS 1123 1000 kPa welded to stub pipes.
  • Inlet connection flanged inside and outside, otherwise flanged outside only.

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