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Becht Engineering has performed  many 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 also can 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.   The relative strength of the inner and outer pipe is also an issue when nonmetallic pipe is used to enclose metallic pipe.  The differential thermal expansion can be accommodated using a floating system where the inner pipe is free to expand within the outer pipe (this is normally the required option when nonmetallic pipe encloses metallic pipe) and a fully restrained system in which the inner and outer pipe are connected, and differential thermal expansion is restrained by axial forces in the piping.  Design of the connecting elements and consideration of buckling are key elements to the latter design approach.

Becht Engineering has designed many double containment systems using both of the above approaches. 

Becht Fitness For Service

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We are organized to quickly and efficiently handle all levels of Fitness-For-Service assessments including rapid response to emergency situations where quick assessments are required to keep a plant running or when damage is found.

For immediate response, contact our FFS coordinator, Magnus Gustafsson (click to email / phone at 571-550-0722) or complete the form. Your form request will go to Mr. Gustafsson, as well as our President, Chuck Becht and General Manager, John Basil.

A quick response is guaranteed!

Finite Element Analysis

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Becht Engineering has developed a reputation as one of the premier providers of Design-By-Analysis services.  We have a deep reservoir of staff that perfrom finite element analysis using commercial programs such as ABAQUS, ANSYS, SolidWorks and products of Paulin Research Group.  Types of analysis include linear and nonlinear analysis, stress, heat transfer and dynamics including seismic.

Given the many analytical tools available, we are able to choose the most efficient and cost-effective tool for the task at hand; for example, we frequently use non-linear analysis to develop more efficient equipment designs and/or to demonstrate that existing equipment is fit for service. Our extensive code expertise enables us to provide authoritative interpretations of the analysis results. Our experts include such frequently published engineers as Greg Hollinger, Trevor Seipp, and Dr. Charles Becht.