GRP sectional
water tanks

With an unrivalled reputation for quality and service Balmoral offers sectional tanks, which can be pre-insulated, ranging from 1m³-10,000m³ litres capacity and erected to a height of 4m in 1m and 0.5m increments.

Hot press GRP sectional water storage tanks

These tanks are designed and manufactured to BSEN 13280 standards and carries WRAS approval for potable water storage. All panels are fully tested to resist pressures in excess of six times their working pressure.

Features and benefits

Designed to BS EN 13280 (2001)
Automated manufacturing
Consistent product offering dimensional stability
Automated finishing
Provides high levels of accuracy
High grade materials
Improved resistance to bacterial growth, increased water resistance, reduced risk of osmotic attack. Colour 00-A-05 to BS 5252
UV stabilised materials
Suitable for global climatic conditions
100% opacity
Prevents algae growth
Heavy duty cover
Low maintenance, resists wind and snow loadings. BS 6399 Pt1 (1996)
Integrated insulation
Provides U value of 0.6W/m2K. CFC and HCFC free. Suitable for water storage up to 38ºC
Exclusive sealant
WRAS approved, provides optimum performance under varying climatic conditions
Designed to BS 6700:1997 to limit structure deformation
WRAS approved
Tanks compliant to WRAS Section 0135, fittings compliant to Water regulation 16 (Byelaw 30) for tanks to 4m depth
Balmoral Tanks is certified to BS EN ISO9001:2015
GRP sectional water storage tank

Tank construction

Tank construction

The Balmoral range of sectional GRP tanks may be specified as either externally flanged base (EFB) or internally flanged base (IFB). This allows the use of either flat continuous foundations, close centre beams, pier walls or bearer beams depending upon the type of base required. The internally built tank (IBT) to be supported as standard on an IFB foundation.

The EFB specification is fully self draining allowing ease of maintenance and cleaning.

Flexibility of panel sizes allows connections to be agreed on site to suit actual tank location
Modular design provides ease of transport and flexibility of assembly on either a prepared flat and level concrete foundation, support walls or bearer beams
Panels are rigidly supported by a combination of stainless steel tie rods internally and galvanised box sections externally
Installation is carried out by Balmoral approved installers, fully trained to provide total unified responsibility

Flange types

EFB: Externally flanged base, externally flanged sides

EFB: Externally flanged base, externally flanged sides

IFB: Internally flanged base, externally flanged sides

IFB: Internally flanged base, externally flanged sides

IBT: Internally flanged base, internally flanged sides

IBT: Internally flanged base, internally flanged sides

Base supports

Pier walls

Pier walls

For EFB tanks allowing self drain. 1m centres required.

Close centre beams

Close centre beams

IFB and IBT tanks may also be supported by steel bearer beams.

Flat foundation

Flat foundation

For IFB and IBT tanks. Flat screed concrete foundation to be level and not vary more than 2mm p/m or 6mm p/6m, measured laterally or diagonally. Levelling steels are recommended due to difficulties in achieving +/- 2mm per metre over whole base area.

Engineering innovation


The design of each sectional tank panel is modelled using FEA software. This allows fine detail to be thoroughly investigated and improved before proceeding to mouldmaking and production.

GRP sectional water tanks


All materials used in the production and assembly of Balmoral GRP tanks are rigorously tested for potable water compatibility. This includes long term material performance and mechanical properties, non-metallic components, adhesives, etc. Combined, these analyses form the basis of the company’s extensive QC procedures.

Manufacturing process

Balmoral sectional tank panels are hot press moulded in glass reinforced plastics (GRP) using isophthalic unsaturated polyester resins and electrical glassfibre reinforcement.

The panels are moulded at temperatures up to 150°C under strict quality control disciplines. The process results in strong, consistent panels which are fully cured, dimensionally accurate with sharply defined profiles and smooth surfaces on both faces.

Drilling and finishing of the panels is undertaken in a purpose built controlled area, where high technology automated drilling equipment is used to complete production to exacting tolerance levels.

GRP tank manufacturing

Thermal insulation

Balmoral sectional tanks use expanded polystyrene (EPS) materials in their thermally insulated panels. This is made using a pentane expansion agent which is CFC and HCFC free and can be recycled by melting down and reforming.

GRP sectional water tank insulated panel
Mechanical property Performance value
Method of manufacture Hot Press Moulded
Specific gravity 1.8
Tensile strength 110 Mpa
Flexural strength 220 Mpa
Flexural modulus Detail
Impact strength 180 Kj/m2
Barcol hardness 90
Shear strength 107.8 Mpa
Glass content > 30%
Thermal expansion 2.0 x 10-5/°C
Thermal conductivity 0.15 Kcal/m hr°C
Overall heat transmission 0.6 W/m2 K
Water absorption < 0.1%
Light transmission Zero
Insulation thickness 40mm EPS
Insulation cover ABS

Case studies

1 Grosvener Square
No.1 Grosvenor Square
Application Cold water storage tanks
Tank type Hot press moulded GRP

5 x 2 x 3m

Scope of work
Design, manufacture, install
Installer Balmoral Tanks
Basildon & Thurrock University Hospital NHS Trust
Basildon & Thurrock University Hospital NHS Trust
Application Potable drinking water storage tanks
Tank type GRP sectional tanks

11 x 7 x 3m and 7 x 2 x 3m

Capacity 231,000 litres and 42,000 litres
Scope of work Replacement programme of main hospital cold water storage tanks
Installer Balmoral Tanks

Sir C Duncan Rice Library, University of Aberdeen
Sir C Duncan Rice Library, University of Aberdeen
Application Potable, non-potable water storage and fire fighting sprinkler tank
Tank type GRP sectional tanks

15 x 3 x 3.5m | 5 x 3 x 3m | 2 x 2 x 2m | 2 x 2 x 2m
and one-piece 1370 litre break tank

Scope of work
Design, manufacture
Main contractor
Pihl UK
Installer SPARKS



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.

Related products

Balmoral Group

©2020 Balmoral Group Holdings Ltd