STeve,
The concern is that the existing valves have cracked bodies for we cannot understand why they have been encased in concrete. One proposal is to chip away the concrete and examine however if the casting is cracvked we are left with the same dilemma. These valves are ona system that provides upwards of 60 % of Sydney's water.
Geoff
--- Steve McKenzie <Mechproj@xtra.co.nz> wrote:
> Hi Geoff
>
> While not gate valves, I was involved with refurbishing hydro station
> multiple headgates about the same size at a small hydro power station of
> similar age. They were in essence a gate valve however. In that case, for
> some of the valves, we found it cheaper and less risky to remove and
> refurbish the leaf and to dress the ways in situ. I cannot recall whether
> the body seat was replaced or dressed.
>
> Cheers
>
> Steve McKenzie
>
>
> -----Original Message-----
> From: Geoff Stone DD&D Australia [mailto:blenrayaust@yahoo.co.uk]
> Sent: Friday, August 23, 2002 4:53 PM
> To: paul bowers
> Subject: [PipingDesign] Connections for a DN 1200 Cast Iron Main
>
>
> We have a DN 1200 (48") water supply line in cast iron with a cement lining.
> The pipe was laid in 1912. We need to remove a gate valve and install a new
> unit. The existing valve is encased in concrete.
>
> The planned method is to cut the pipe away from the valve, remove pipe and
> valve in one piece and install new flange spools and valve. Our problem is
> we
> need to fit to the existing cast iron a flange such that the flanged spool
> can
> be attached.
>
> Firstly we shall excavate the pipe and check out the surface to see if we
> can
> use a coupling with lip seals but expect the surface to be pitted. We are
> considering repairing this with an epoxy if not too bad.
>
> We seek your experiences in this type of problem.
>
> =====
> Design Detail and Development (a division of Blenray Pty Ltd)
> We specialise in pipe network and waterhammer analysis, pipe stress
> analysis, buried pipelines and the design of thermoplastic pipe systems.
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