Connections and fittings All pipe connections are made at HB’s 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
Towers
When a constant pressure head of water is required for supply purposes, tanks can be mounted on a mild steel tower at a suitable height.
Insulation
Horseley Bridge Tanks uses 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.
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. Horseley Bridge 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.
Horseley Bridge 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 HB know what additional loadings on towers may be required in the future.
On request HB can supply loading and uplift details enabling contractors to design suitable foundations.
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 Horseley Bridge warranty conditions. HB’s contract does not provide for a member of staff being present during filling.
Conditions of contract
All work is carried out under HB conditions of sale as stated in the original quotation. Extra copies are available on request.
