Supply of Valves and Hydrants

Organisation

Dwr Cymru Cyfyngedig

Fortran Road, St Mellons, Cardiff, CF3 0LT

This scope of works contains the details relating to the Supply of Valves & Hydrants Framework, . The Framework covers; • The supply of Valves from 50mm up to 800mm diameter and Pressure rating PN16 up to PN40 • The supply of Hydrants Strategic stock-holding where required.(Ability for Supplier to Support) It is intended to have 2 lots in this framework for Valves and Hydrants as follows:- Lot 1 - Gate Valves, Air Valves, Butterfly Valves, Ball Valves, Non-return Valves Gate Valves - Used for the isolation of a pipe that may contain raw, potable, waste water or sludge. Operating under a range of conditions and pressures these valves use a lifting gate that is operated to isolate flow in the path of a fluid. Air Valves - Designed to act as air release and protect against vacuum conditions from a water or waste water system. They allow automatic air release in pipelines to increase system efficiency and damage to the main. Under vacuum conditions, they automatically allow air into a main to prevent damage and potential collapse of the main. Butterfly Valves - An isolation valve that uses a rotating disc over a quarter turn to isolate pipeline in a water or clean effluent system. Suited to a range of applications and pressures with a number of configurations designed to allow for speedy operation. (Wafer Pattern, Flanged – Long Pattern, Flanged- Short pattern other are all Butterfly valves). Ball Valves - A valve that can operate to isolate and also to offer flow control, this is a quarter turn valve that uses a hollow and pivoting ball. The ball rotates in the pipe to offer the characteristics and flow rates above. Can be used in potable, raw and limited waste water. Non-Return Valves - These valves are also known as check valves and come in a variety of forms and these depend upon application. All do the same role and this is to prevent a liquid from flowing backward in a pipe or to ensure flow in one direction. This maybe to protect infrastructure or to aid pumped systems. Specific valves are used for potable water, raw water, and waste water or sludge applications. NRV’s can operate automatically or be assisted to close faster in a variety of ways and can be used to aid the prevention of water hammer. (Swing Check, Flap, Tilting Disc, Duck Bill, Wafer, Ball, Nozzle Ring are all non-return valves).

The hydrants required are for Pressure Rating PN16 up to PN25 for access of water from main for either system operability or cleaning or for use by fire service. These hydrants are multifunctional and designed to allow pressurised water in a controlled way to be released from the main and more recently to allow leak detection, condition monitoring or sensors into a live main. Potential customers for Hydrants would be capital suppliers, waste and water operations, Water Network Alliance, Stores (mix of direct supply and into the supply chain)

15

total contracts

£1367.2m

total value

£124,289,091

average contract size

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WAC Reference

WAC-503665

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