RE: Double Restraint of DI Piping

From: <Steve>
Date: Fri Oct 14 2005 - 16:40:00 EDT

Hi Ken
I have seen the combination used around pumps where pipework needs to be periodically removed and adjustments made. Strictly speaking, I think from memory every joint could have been classified as either anchored or tied, but it didn't really look like that. For example one bend was concrete anchored and also tied to another unanchored bend. Perhaps your client means anchors or tie-rods. Or perhaps your client isnt really sure what he means.

Cheers

Steve

-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=ocYk4g6Mqi3ygz8zZG9pg5ETXzz3Yz5ar0i1vzB6SrtPwMS88-CDL67Hmxy5r3EJrKE64rbOONr7BHAaLkc7cXahEXCS1Qo">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=ocYk4g6Mqi3ygz8zZG9pg5ETXzz3Yz5ar0i1vzB6SrtPwMS88-CDL67Hmxy5r3EJrKE64rbOONr7BHAaLkc7cXahEXCS1Qo">PipingDesign@yahoogroups.com</a>] On Behalf Of Ken Nisly-Nagele
Sent: Saturday, October 15, 2005 4:03 AM To: <a href="/group/PipingDesign/post?postID=ocYk4g6Mqi3ygz8zZG9pg5ETXzz3Yz5ar0i1vzB6SrtPwMS88-CDL67Hmxy5r3EJrKE64rbOONr7BHAaLkc7cXahEXCS1Qo">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] Double Restraint of DI Piping

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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