Steel sectional
water tanks

Balmoral hot pressed steel sectional tanks with capacities of up to 1300m3 have been installed worldwide in water supply projects, the food and processing industries, hotels, railways, hospitals and the utilities sectors.

Hot press steel sectional water storage tanks

Balmoral tanks can be found throughout the UK and around the world, particularly in the emerging nations, where water – the basis of life – is often difficult to obtain and has to be preciously guarded.

The development of Balmoral Tanks’ EPDM rubber sealing system, combined with the application of various coatings suitable for the storage of potable water, has made safe storage of this valuable resource even more secure.

Tanks can be provided for ground level installation or elevated on steel structures that are specifically designed and fabricated by Balmoral.


Manufactured under formal quality assurance procedures to BSEN ISO9001
Tough, vandal resistant for unsupervised sites
Easy to build, only moderate skills required
No on-site welding, no fire hazard
Flexible system, capacity almost infinitely extendable
Low physical profile (at ground level)
Ideal for temporary requirements being simple to dismantle
Technical support provided for site measurements and advice
Technical drawings provided
Full tank erection and site inspection by trained staff
Design and supply of steel towers for elevated tanks
Proven track record over many years
Steel sectional water storage tank
Steel sectional water storage tank

Tank construction

General construction

Balmoral pressed steel tanks are bolted mild steel sectional water storage containers. Plates are hot-pressed in our factory in the UK to BS1564:1975 Type 1.

The panels are manufactured in 1.22m2 (4ft2) sizes with thicknesses ranging from 3-6mm depending on tank depth and use. Half plates are available. Steel used in plates, stays, cleats, etc, conforms to BSEN10025:1993 S275JR (43A equivalent).

Tank plates are bolted together using an approved sealant. For ease of access to bolts, tanks are supplied with external flanges unless customers specify otherwise.

To support pressures exerted by the tank’s contents, the sides of all tanks at the junction of four plates are supported by rolled steel angle stays attached to cleats of equal strength bolted to tank plates. The pattern of internal stays depends on tank size and varies between horizontal, vertical and diagonal.

Surface coatings and finishes

A wide range of coatings can be applied to the inside and outside of the tanks which include hot dip galvanising (BSEN ISO 1461:1999) and WRAS approved systems. Balmoral Tanks also offers a DWI (Drinking Water Inspectorate) approved coating which meets the requirements of Regulations 31-33 (Reg 25 in Scotland) of the Water Supply (Water Quality) regulations.

Storage of liquids

The bolted construction of the tanks allows storage of water up to 90ºC. Temperatures in excess of this would require the tank to be fully seam welded. For clarification of storing other liquids please consult our engineering department.

To maintain water quality, tanks should be periodically drained, cleaned and disinfected. To ensure continued water supply during cleaning, divided tanks can be supplied where one compartment is used while the other is cleaned. See BS6700:1997 for additional advice.

Covers and roofs

The roof construction of all steel sectional tanks is designed to support the weight of maintenance personnel and their equipment. Design superimposed load is 0.75kN per m2.

Flat covers can be provided for use inside buildings. Pitched roofs are recommended for outdoor use to allow rainwater to run off. All roofs are fitted with a lockable 600mm2 hinged and sealed manhole. Screened (0.65mm mesh) cowl ventilators are provided as standard.

The ends of pitched roofs are closed with stiffened gable fillers which are bolted to the roof and wall plates.

All joints incorporate jointing strip to make them weather and vermin proof.

Pressed steel tanks are not designated as pressure vessels, but in special circumstances the roof can be constructed from standard plates to allow a slight internal pressure.

Laser cutting

Balmoral Tanks uses the latest laser cutting technology to bring high levels of accuracy to its panels. The cutters use a 3D capability providing precise, repeatable, burr-free profiles and are BSEN ISO 9001 certified.


When a constant pressure head of water is required for supply purposes, tanks can be mounted on a steel tower at a suitable height. Towers must be designed with suitable seismic and wind loads to accredited standards.

Balmoral Tanks provides a full design and supply service for towers, to BS5950. When specifying tower requirements it may be advisable to anticipate future increases in tank capacity. Customers are advised to consider foundation requirements and to let Balmoral know what additional loadings on towers may be required in the future.

On request Balmoral can supply loading and uplift details enabling contractors to design suitable foundations.

Pipe connections and fittings

All pipe connections are made at Balmoral Tanks’ factory before dispatch and customers are asked to provide full details when ordering. The type of pipe connection should be specified together with the relevant standard to which the coupling flanges are drilled or the pipes screwed. To assist delivery, the size and position of each connection should also be specified at the time of ordering. Ball and gate valves and all pipework, including bends and flanges, can be supplied if specified at the time of ordering.

Connections can be supplied as flanged stools to BS4504, ASA or DIN standards, or, for small pipework, screwed sockets to BS1387. The connections are shop-welded to the plates in positions agreed at the time of order.

Pipework configuration

The inlet or delivery pipe can enter the tank through either the side wall at the top of the tank or through the tank base. Flow can be controlled through a ball valve, equilibrium float valve or automatic float switch.

The outlet or service pipe should be taken through the base of the tank and fitted with an internal bellmouth pipe or rose strainer to prevent suspended matter entering the water supply.

The overflow should always be fitted to give at least 75mm of freeboard below the top of the tank in accordance with the UK Water Byelaws, or other regulations, to give the required air gap.

The washout pipe opening should be fitted flush with the bottom of the tank and a sluice valve fitted immediately below the tank base.

Optional extras

Ball-valve housing used to raise water level to maximise storage
Screened overflows and warning pipes to Water Regulation 16 (UK Byelaw 30)
Internal and external mild steel ladders complete with safety hoops and rails
Walkways with railings
Indicator gear or contents gauges
Air gaps to latest WRAS guidelines
GRP sectional water tank insulated panel


Balmoral pressed steel sectional tanks use an integrated insulation system which is mechanically fixed to the steel plates and incorporates "Envirotherm 70" EPS foam insulation. The foam is dimensionally stable with very low water ingress ensuring long term thermal performance. It is made from a pentane expansion agent which is CFC and HCFC free and can be recycled by melting down and reforming.

The external skin of the panel is manufactured in UV resistant thermoplastic giving an overall typical thickness of 95mm providing a typical U value of less than 0.4 W/m2K.

Filling and testing

This should be done as soon as possible after the tank is built and in any event within the time specified in Balmoral Tanks’ warranty conditions. Balmoral Tanks’ contract does not provide for a member of staff being present during filling.

Conditions of contract

All work is carried out under Balmoral Tanks conditions of sale as stated in the original quotation. Extra copies are available on request.

Case studies

Saint-Gobain (Isover) Runcorn
Saint-Gobain (Isover) Runcorn
Application Cooling tower water tank
Tank type Hot press steel sectional tank

12.2 x 4.88 x 2.44m

Capacity 145.27m3
Scope of work Design, manufacture and installation
Coca Cola Bottling Company of Ghana
Coca Cola Bottling Company of Ghana
Application Raw water storage
Tank type Hot press steel sectional tank

25.6 x 24.4 x 4.9m

Capacity 3000m3
Scope of work Design, manufacture



Additional information (if known)

Please give an indication of required tank capacity
Is your tank installation to be located indoors or outdoors?
Please provide foundation type/information, if known
Please provide accessibility distances around the proposed tank location

View Balmoral Tanks terms and conditions of use.

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