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Becht Engineering Blog

In this section of the site contributing authors submit interesting articles relating to the various services, industries and research & development efforts of Becht Engineering.

Negotiating Plant Access for Due Diligence

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Just the Facts Ma’am The famous phrase, “Just the facts, Ma’am,” was often linked to Los Angeles Police Department Sargent Joe Friday who wore badge 714 on the TV show Dragnet. However, according to several sources, the facts are Joe Friday never said this exact phrase on the long running TV show.  The statement “Just the facts, Ma’am” was in a parody of Dragnet by Stan Freberg. Facts can be surprising. When we perform due diligence studies we want to be sure we get “Just the facts” as quickly and accurately as possible. This is only possible if the facility that is the subject of the study is prepared, open and honest and we are able to visit the site. We need to physically walk down the plant, review records and talk to personnel up and down the organization. This blog is a request to our clients who are interested in...
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CFD Analysis with Scale Model Verification - A Proven Cost-Effective Approach

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Contributing Authors - Dave Dewees (Becht) and Dr. Keith Kirkpatrick (McHale Performance)  Reducing HRSG & Stack Pressure Drop to Improve Profitability Many operating Simple and Combined Cycle HRSG (Heat Recovery Steam Generator) ducts and stack exhaust system designs can be optimized to reduce pressure drop, improve combustion turbine backpressure, improve performance and increase revenue.  CFD analysis with Scale Model Verification is a proven and cost-effective tool for quantifying recoverable performance loss and improving generation plant profitability. Combustion Turbine exhaust/HRSG/SCR ductwork, breeching and stack systems require careful attention during detailed engineering and design. While EPC Contracts typically include both performance guarantees and liquidated damage provisions which are highly dependent on Combustion Turbine backpressure, the design of this critical stack system is many times “farmed out” to 3 rd party stack, HRSG or other less qualified suppliers. This practice can result in an un-optimized design with higher than necessary pressure drop resulting in reduced...
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Pipe Fabrication Dimensional Errors -- I Can't See You!!!

I_cant_see_you_Becht_dimensional_control Dimensional Errors? I Can't See You
Can a level, square and tape measure really measure up to today’s quality standards on complex spools? I was watching my baby girl cover her eyes as she had done something naughty. Doing this gave her the feeling that if she couldn’t see her mother or myself then she would not get into trouble. Despite her feeling of invisibility, she still ended up getting into trouble and having to apologize for what she had done. It’s funny as this is sometimes how the Chemical, Oil and Gas industry acts when it comes to assigning appropriate project dimensional quality control for pipe spools. Green field or brown field (based on a laser scan) projects are typically designed on a specialist CAD platform which enables the designer to design to levels where machine shops would be the only way to match the design model tolerances. This way of designing can provide huge levels...
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Grade 91 Steel - How Did We Get Here? Part 1

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This blog is the first part of a 3-blog series. To view the rest of the story click HERE for Part 2 and Here for Part 3 . Part 1: History Thirty years ago, Grade 91 (9Cr-1Mo-V) steel was hailed as the savior of the power generation industry [1]; now it’s behavior has been described as too variable to ensure safe operation [2].  What happened?  At the same time Grade 91 was being developed in the late 1970’s for high temperature nuclear reactor application [3], power plants that had been designed and operated as base-loaded were suddenly cycled on a regular basis.  The standard material for high temperature steam outlet headers was first 1¼Cr–½Mo (Grade 11) and later 2¼Cr–1Mo (Grade 22); in both cases headers rapidly began to experience severe cracking in and between header penetrations.  The cracking was termed “ligament cracking” [4] and by the mid-1980’s had become a complex...
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