The name Braithwaite is synonymous with water storage worldwide. During its ninety year period of storage tank manufacture and installation, Braithwaite has gained an enviable reputation for the quality and reliability of its products. The Hot Pressed Steel Sectional Tank is perhaps unique for an industrial product – the design although refined over the years, is still essentially the same product that was originally patented in 1901. Its continued use provides ample testimony to the virtues of the Braithwaite Hot Pressed Steel Sectional Tank. Throughout the intervening period the tank has given sterling service all around the world. With current examples ranging from the intense heat of Africa and the Middle East, to the extreme cold of Siberia and Antarctica, it continues to be a market leader in many countries providing cost effective engineered solutions to water storage problems. The Braithwaite Hot Pressed Steel Tank is easily recognised by the distinctive star pressing in the centre of the panel, which in addition to providing strength and rigidity is also the Company logo and a registered trade mark.

QUALITY & COMPLIANCE Braithwaite ensures quality control through the rigorous application of best working practices and current international standards, confirmed by its accreditation with an EN ISO 9001: 2000 Quality System approved and audited by the Loss Prevention Certification Board (LPCB). Braithwaite has been endorsed by many government bodies, blue chip companies, contractors, consulting engineers, finance institutions and aid agencies. Braithwaite Hot Pressed Steel Tanks are approved by:

WRAS for use with water stored at ambient temperature.

BS1564: 1975 Type One.

WRAS and LPCB for use on automatic sprinkler installations.

SERVICES OFFERED Braithwaite offers a full design, fabrication, protective treatment, shipment & erection service for tanks, towers and ancillary items. Design work is in accordance with BS449 or BS5950, including the incorporation of any specified seismic, wind and snow loading to be accommodated. Qualified engineers can be provided to survey & prepare reports on existing tanks & structures, to undertake feasibility studies, to supervise erection or to fully manage construction sites. Braithwaite can supply their own teams of trained sub-contractors to carry out all forms of erection, modification or refurbishment. The labour force is fully conversant with the working and safety procedures relating to large construction projects, time constraints imposed by plant shutdowns and the requirements of particular industries. Braithwaite offer their services through the UK and world-wide. ENSURE A CLEAN SUPPLY OF WATER…

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HOT PRESSED STEEL TANKS

THE CONCEPT Braithwaite Hot Pressed Steel Tanks are formed using mass-produced tank plates and prefabricated cleats and stays bolted together on site, to give an infinite range of sizes and capacities, in accordance with British Standard BS1564: 1975 Type One. Though generally square or rectangular in construction, tanks can be provided in a variety of forms to suit particular site conditions or project requirements. The most common deviations are “l” or “T” shaped tanks (plan or elevation) and tanks “noteched” to avoid obstructions. Through a variety of flanging arrangements Braithwaite tanks can be designed to be supported on concrete rafts or consolidated foundations (where headroom is restricted), on grillages at ground level or in plant rooms (providing access to the underside for inspection and maintenance) or elevated on steel or concrete towers (providing a static head of water). Where site access is severely restricted a completely internally flanged tank can be designed, providing access to all connections from within the tank.

The modular concept and bolted construction allows for high speed assembly utilising semiskilled labour. This provides obvious client advantages and cost benefits associated with reduced site duration’s when considered against traditional concrete or welded steel construction. Refurbishment is relatively straightforward as individual components can be inspected and replaced as required. Similarly, dimensional and capacity alterations can be accommodated with minimal downtime, indeed if requested at concept stage, tanks can be designed for extension in length without interruption to the water supply. Although best known for the storage of potable water, a wide range of liquids can be stored in Braithwaite tanks and the sectional method is also well suited to the storage of solids in granular or flake form. In addition to the construction of storage tanks, the tank plate has provided our engineers with solutions to a variety of challenges and has been used in the construction of bund walls, blast walls, retaining structures, access shafts, baffles, weirs, pontoons, jetties and even a floating heliport!

FEATURES & BENEFITS Modular bolted construction provides: Infinite range of sizes and configurations. Excellent flexibility to adapt as storage requirements change.

Ability to be installed in areas with restricted access.

Quick and simple assembly using hand tools. Highly economical transportation.

Hot pressing of tank plates using matched tools ensures: Close control over quality of product. Consistency of tank plate size. No requirement for welding corners of plates. No distortion as heat treatment dissipates stress.

All steel construction provides: Inherent strength and durability of the raw material.

High resistance to damage during transit and assembly.

Excellent substrate for a wide range of protective finishes.

Long term life expectancy.

THINK TANK – THINK BRAITHWAITE

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TANK COMPONENTS TANK PLATES The standard tank plates are 1000 or 1200mm square, hot pressed from mild steel plates in one piece and embossed with the distinctive star pressing. Thickness of panel ranges from 4mm to 6mm, determined by tank depth and contents. Non standard plates can be fabricated to provide full versatility for specific requirements. COVERS Covers can be provided for either interior or exterior conditions and are designed to withstand superimposed loadings in accordance with the requirements of BS449 and loading imposed by maintenance personnel. Suitable jointing materials ensure covers are dust or weatherproofed to suit their application.

Special covers can be constructed from flanged tank plates to allow for pressure differentials and advice can be provided to ensure suitability for each application. DIVISIONS To enable maintenance of the tank without interruption of the water supply, tanks can be fitted with divisions. Divisions are constructed from standard tank plates and are designed to operate with either compartment empty. It is advisable for all tanks storing 5000 Litres and above to be fitted with a division. FLOAT VALVE CHAMBERS In order to obtain added capacity in covered tanks or to provide a type ‘A’ air gap for compliance with the WRAS, preventing back siphonage, float valve chambers can be supplied. Theses are fixed to the cover plates and enable the normal allowance for freeboard to be reduced. Where supplies to the tank are derived from more than one source, multi-float valve assemblies can be mounted in a single box. It is possible that the use of a ball valve box will necessitate increasing the minimum distance between the cover and the ceiling above it.

Standard covers are fabricated from 3mm thick steel plate and are not designed to withstand pressures other than those described above.

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CLEATS & STAYS All internal fittings are fabricated from steel and carefully designed to ensure the strength and rigidity of each tank size. Where special applications make the use of internal staying impossible, angle and channel stiffeners can be provided externally. BOLTS, NUTS & WASHERS All bolts used in the construction comply with the requirements of BS.1564. For export contracts, a complete set of spanners is provided, together with a percentage of spare bolts, nuts and washers. JOINTING MATERIALS A simple type of strip jointing material is used between the flanges of the tank plates, under the tank cleats and for sealing the cover plates. Standard jointing materials are available for a variety of tank contents, including potable water and fuel oils. Full information is required at the enquiry stage to ensure complete satisfaction. When the normal jointing materials cannot be used it is possible to seal weld the internal seams of Braithwaite tanks. INSULATION Tanks can be site insulated using the unique BelTherm 70 system. PROTECTIVE TREATMENT Braithwaite offer two standard shop finishes: Hot dipped galvanising to BS EN ISO 1461: 1999. Blast clean to BS 7079 second quality followed by one coat of two pack epoxy zinc phosphate primer.

Non standard finishes can be provided on receipt of specific requirements, including sprayed zinc or aluminium, G.R.P. and hot applied bituminous enamel. Site applied paint systems can be provided to BS 5493,which give typical times until first maintenance in excess of 20 years. For drinking water applications Braithwaite use WRAS approved products. The key to maximising the life of a pressed steel tank is the choice of its protective coating system and an effective maintenance programme. Braithwaite can offer advice on the most suitable system for a given application. MODEL SPECIFICATIONS AVAILABLE

TANK FITTINGS STANDARD FITTINGS Braithwaite Hot Pressed Steel Sectional Tanks fitted with covers feature the following fittings as standard: 460mm diameter access manway with hinged lid. Screened cowl ventilator. Internal access ladder for tanks deeper than 1220mm.

OPTIONAL FITTINGS External ladders and handrails to BS 4211. Float valve chambers. Contents gauges. Sumps. Access manways to suit a variety of different applications. Anti-vermin screens for overflow and warning pipes to comply with Water Byelaw 30.

Spill over weir boxes to provide type ‘A’ air gaps, in accordance with BS 6281: Part 1.

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PIPE CONNECTIONS Three basis types of pipe connection are used on Braithwaite tanks: BSP tapped sockets for screwed pipework up to 76mm bore.

Pads with studs for pipework flanged to BS 4504. BSP tapped flanges for screwed pipework.

Pipe connections are normally fitted to the tank plates prior to despatch. PIPEWORK & VALVES The selection of suitable pipework and valves for Braithwaite Pressed Steel Tanks should always be considered at the planning stage so that they can be ordered with the tank, ensuring that they are available in good time and suitable for the tank concerned. The Rising Main (1). This may enter the tank by a right angled bend passing through a tank plate (at the top). Alternatively, a vertical standpipe fixed to the bottom of the tank can be used. Control of Flow (2). This can be affected by an equilibrium float valve or other suitable device. Outlet Services (3). These should be taken from the bottom of the tank, preferably via a rose strainer. Overflows (4). A bellmouth fitted to a vertical standpipe fixed to the bottom of the tank is recommended. Alternatively, a right angled bend passing through a tank plate is suitable. Either should be positioned below the level of the supply valve. Washout (5). This is not essential but is recommended. An external pipe connection should be used, the pipe being arranged to join the overflow pipe. A sluice valve must be incorporated in the short pipe run before joining the overflow. Pipework, Valves etc. These should be grouped as near together as possible for ease of operation. Such grouping for tanks supported on towers enables control to be made from the access ladder or a purpose made platform. Pipes should be supported at or below ground level on duck footbends (6) which are in turn supported on concrete footings (7). Close grouping of pipework and valves is recommended for tanks divided into two compartments so that a single control point can serve both. It is not good practice for pipes to pass through the cover plates of tanks.

TANK CONFIGURATIONS EXTERNALLY FLANGED TANKS (1) Wherever possible externally flanged tanks should be utilised because: assembly bolts in the tank sides and base are external for ease of assembly, maintenance and inspection.

the majority of the tanks contents can be drained by using a washout connection in the base of the tank.

Tanks of externally flanged construction require: 500mm clearance all around and underneath the tank for assembly and maintenance.

700mm clearance above the cover for access into the tank. INTERNALLY FLANGED BASE TANKS (2) Where head room within a building is restricted, Braithwaite offer the option of a tank with externally flanged sides and an internally flanged base. Due to the base plates being inverted: the contents of the bottom 82mm of the tank cannot be used. the flange bolts in the tank base are accessible from within the tank.

maximum height of tank is 3 panels i.e. 3660mm or 3000mm high.

Tanks of this type of construction require: 500mm clearance all around the tank for assembly and maintenance.

700mm above the cover for access into the tank. TOTALLY INTERNALLY FLANGED TANKS (3) Tanks which are totally internally flanged can be used where it is essential to make full use of a confined site. Due to the flange arrangement: the contents of the bottom 82mm of the tank cannot be used. All the flange bolts are accessible from within the tanks. The maximum height is 3810mm or 3150mm, i.e. 3 panels plus 150mm.

The overall length and width of the tank is increased by 300mm.

Tanks with this flange arrangement require: A minimum of 25mm clearance on 3 sides, with 500mm clearance on the fourth side.

700mm above the cover for access into the tank.

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(3)

(2)

(1)

Tank with internal flange to the

base and external flanges to the sides

Tank with Internal flanges

throughout

Tank with external flanges

throughout

Note: vertical walls in detail (3) show typical site restrictions

TANK SUPPORTS EXTERNALLY FLANGED TANKS (A) & (B) Dwarf walls in brick or concrete form the most economical supports and should be built in one direction only beneath each seam of the tank. They should exceed the length or width of the tank by 300mm overall (see detail A). For tanks exceeding 2440mm in height a galvanised mild steel capping flat should be provided between the top of the wall and the base of the tank. An alternative method of support is by universal beams positioned on top of cross walls running in the other direction (see detail B).

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(B) Steel beams are to be levelled to +/-3mmAllowable deflection 1/500th of span

Externally flanged tank supported on steel grillage

(D)

Steel beams are to be levelled to +/-3mmAllowable deflection 1/500th of span

Tank with Internal flanges

throughout

(A) Walls are to be levelled to +/-3mm with no local high spots over 1mm

(C) Floor to be levelled to +/-3mm No local high spots over 1mm

Tank with external flanges to the side

and internal flanges to the base.

TOTALLY INTERNALLY FLANGED & INTERNALLY FLANGED BASE TANKS (C) & (D) Generally these types of tanks are supported on consolidated foundations or concrete rafts, levelled to +/-3mm, with no local high spots over 1mm. The overall dimension of the slab should be 300mm greater than the nominal plan size of the tank. A layer of bituminous sand 50mm thick nullifies any unevennessin the concrete raft and protects the base of the tank against corrosion. Alternatively they can be supported on universal beams positioned in one direction only beneath each seam of the tank.If a totally internally flanged tank is supported in this manner dual beams are required under division walls.

NOMINAL TANK CAPACITY IN LITRES – 1220mm PLATES NOMINAL TANK CAPACITY IN LITRES – 1000mm PLATES

TYPICAL TANK CAPACITY CHARTS

HEIGHT OF TANK (mm) LENGTH

(mm) BREADTH

(mm) 1000 2000 3000 4000

1000 1000 821 1,675 2,529 3,383 2000 1000 1,710 3,488 5,266 7,044 3000 1000 2,599 5,301 8,003 10,704 2000 2000 3,561 7,263 10,965 14,666 3000 2000 5,412 11,038 16,664 22,289 4000 2000 7,263 14,813 22,362 29,912 3000 3000 8,225 16,775 25,324 33,874 4000 3000 11,038 22,512 33,985 45,459 4000 4000 14,813 30,210 45,608 61,006 5000 4000 18,588 37,909 57,231 76,553 5000 5000 23,324 47,570 71,816 96,062 6000 5000 28,061 57,231 84,401 115,571 6000 6000 33,760 68,854 103,948 139,042 7000 6000 39,459 80,477 121,495 162,512 8000 6000 45,158 92,100 139,042 185,983 7000 7000 46,120 94,062 142,004 189,945 8000 7000 52,781 107,647 162,512 217,378 9000 7000 59,442 121,232 183,021 244,811 8000 8000 60,404 123,194 185,983 248,773 9000 8000 68,027 138,740 209,454 280,168

10000 8000 75,650 154,287 232,925 311,563 9000 9000 76,612 156,249 235,887 315,525

10000 9000 85,196 173,758 262,320 350,882

HEIGHT OF TANK (mm) LENGTH

(mm) BREADTH

(mm) 1220 2440 3660 4880

1220 1220 1,547 3,144 4,740 6,337 2440 1220 3,197 6,496 9,795 13,095 3660 1220 4,846 9,848 14,851 19,853 2440 2440 6,606 13,424 20,242 27,059 3660 2440 10,015 20,351 30,668 41,024 4880 2440 13,424 27,279 41,134 54,989 3660 3660 15,183 30,854 46,525 62,196 4880 3660 20,351 41,357 62,362 83,367 4880 4880 27,279 55,434 83,590 111,746 6100 4880 34,206 69,512 104,818 140,124 6100 6100 42,893 87,165 131,437 175,709 7320 6100 51,580 104,818 158,056 211,294 7320 7320 62,026 126,046 190,066 254,087 8540 7320 72,472 147,274 222,076 296,879 9760 7320 82,918 168,502 254,087 339,671 8540 8540 84,678 172,078 259,478 346,877 9760 8540 96,883 196,881 296,879 396,876

10980 8540 109,089 221,684 334,280 446,875 9760 9760 110,848 225,259 339,671 454,082

10980 9760 124,813 253,638 382,463 511,288 12220 9760 138,777 282,016 425,255 568,493 10980 10980 140,537 285,591 430,646 575,700 12220 10980 156,261 317,545 478,829 640,113

NOTES: 1) The nett capacities in these tables are based on actual internal

dimensions and assume the tanks to be full to the brim. 2) The capacities given in BS1564 are based on the nominal

dimensions - the capacity of a metre cube being 1000 litres. - the capacity of a 1220mm cube being 1815 litres. 3) For conversion to imperial gallons divide the figure shown in litres

by 4.546 4) The above represents a typical range only with many alternative

sizes being available. 5) To obtain the external measurements of the tank the following

allowances should be added to the dimensions shown above:

FLANGE ARRANGEMENT LENGTH BREADTH HEIGHT EXTERNALLY FLANGED +88mm +88mm +44mm INTERNALLY FLANGED BASE +88mm +88mm +82mm TOTALLY INTERNALLY FLANGED +300mm +300mm +150mm

In line with our policy of continual improvement, the Company reserves the right to change specifications without notice.

BRAITHWAITE ENGINEERS LTD NEPTUNE WORKS, USKWAY, NEWPORT, SOUTH WALES, NP20 2UY. U.K.

Telephone: +44 (0) 1633 262141 Facsimile: +44 (0) 1633 250631 E-mail: tanks@braithwaite.co.uk

Braithwaite Engineers Limited is a member of the ROWECORD GROUP