New at PipingDesign.com: 07 July 2000

PipingDesign.com Pipe Section
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Factory -Designed vs. Field-Designed Double Containment Piping PERMA-PIPE
<<A common mistake regarding double-contained piping is to make the simple
assumption that double-contained pipe is merely a pipe within a pipe and that it can be easily fabricated in the field by an installing contractor. This simply is not the case. There is much more to double-contained piping than just sliding one pipe inside another. The integrity of a double-contained piping system is dependent upon many factors: the suitability of the materials used for the service conditions, the design of the piping system to meet the design conditions it will encounter and the details of construction. The complications associated with these considerations are compounded when different materials are used for the carrier pipe and containment pipes, particularly when nonmetals are involved. A properly designed, fabricated and installed piping system will provide many years of trouble-free operation.>>

Double Containment Piping Systems
Fibercast Company

Double Containment Pipe
Becht Engineering Company, Inc.

<<Becht Engineering has performed a number of design, analysis, and design
review projects on double wall piping systems constructed of metallic, thermoplastic (e.g. polypropylene), and thermosetting (e.g. FRP) material. We have found, particularly in our design review activities, that a commonly misunderstood and/or neglected aspect of the design is differential thermal expansion between the inner and outer pipe. This can be from normal operating temperatures of the contained fluid, or during occasional events such as steam out. The common situation is when the inner pipe may contain a hot fluid and expand lengthwise relative to the outer pipe. It can also contract relative to the outer pipe when containing cold fluids. An additional contributor, which can be significant for plastic piping systems due to their lower stiffness, is longitudinal expansion due to internal pressure.>>

PipingDesign.com Piping Design Section
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Design for Constructability (The Ten Commandments of KISS Design) W. J. Boyce (similar to below, better graphics)

<<Designing for constructability will be just a buzzword without the right
team. The team must have the right attitude, experience and authority (or the guts to take the authority) to make things happen. It is based on the same philosophy as the "Ten Commandments of KISS Design">>

Front End Change is Required When Designing for Constructability Hydrocarbon Processing (W. J. Boyce)

<<Change is absolutely essential for progress. Without change we keep
building the same old things to the same old standards, which is the very definition of No Progress. The change must be at the front-end of the project, during the conception phase. Changes after the conception phase and during the execution phase will be disruptive rather than constructive to the project. Open minds are also essential for change; closed minds do not accept change. An open mind found that the world is round; the closed minds said he's going to fall off the edge of the world. Change also requires a strong project management team with a project manager that has an executive role. Designing for Constructability is really Just updating old engineering standards, specifications and procedures. Most of these documents were developed years ago when the building materials were expensive and manpower was less expensive. These antiquated practices are costing companies, both owners and contractors, a lot of money on every project. This money doesn't benefit either owner or contractor; it goes right down the drain. When you hear, "We've always done it this way', you can be sure of obsolescence.>> Received on Fri Jul 07 14:09:00 2000