Hi,
I have never come across sucha requirement. Suggest if the ground conditions are so poor then a change to a welded steel pipeline is in order.
AS2280 DI PIpe has Class 35 pipe. ie nominal 3500 kPa. Installation techniques are generallythe same as Class 20. 2450 kPa(350 psi) is not such high pressure. Given that the thrust blocks would become large why not use a flange class?
Geoff Stone
Ken Nisly-Nagele <knislynagele@applied-e-s.com> wrote: For underground water mains (ductile iron at 350 psi working pressure), generally 12 to 24 inch diameter, a client's specifications appears to require restrained joints AND thrust blocks, anchors, or tie-rods. What I would describe as double restraint. My experience has been restrained joints OR thrust blocks, anchors or tie-rods. We are scheduled to discuss this with the client, and I am interested to know whether others have provided double restraint design and for what reasons? To be doubly sure of restraint when cost is not a primary concern?
Ken A. Nisly-Nagele, P.E.
Project Engineer, Mechanical
Applied Engineering Services, Inc.
7999 Knue Road
Indianapolis, IN 46250
317-585-8920
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Received on Sun Oct 16 17:25:00 2005
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