RE: Connections for a DN 1200 Cast Iron Main

From: <Steve>
Date: Fri Aug 23 2002 - 02:02:00 EDT

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.

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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. Local tel 0402 35 2313 fax 02 8850 2313
Overseas tel 61 402 35 2313 fax 61 2 8850 2313 Mail Address PO Box 1351 Castle Hill NSW 1765 Australia

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www.texasflange.com

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