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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.

Is Your Execution Contractor Ready for the Turnaround?

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In our experience as Turnaround Readiness reviewers and participating in lessons learned events, owners who pay close attention to contractor readiness end up with better turnaround performance.  While this seems an obvious observation, the details which emerge from lessons learned from post-turnaround reviews reveal the complexity and criticality of the Owner/Contractor relationship. Preliminary review of basic items such as the Contractor’s understanding of scope, critical path and scheduling are underpinned by a side by side review of specific contractor readiness: Critical path work packages should contain quality assurance/quality control (QA/QC) definitions to assure effective work package turnover and the understanding for those owner/ contractor personnel required to sign off on the completed system.   Dimensionally check the spools versus cut points, validate the Bill of Materials versus warehouse package, and talk through the setup, execution and breakdown of the craft at the work point. Field walkout(s) of critical path packages between the...
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Why do Clamped Connections With Metallic Seals Sometimes Leak?

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Clamp connections with metallic seals can offer superior joint integrity over traditional flanged connections but caution must be exercised regarding the service conditions, especially when cyclic thermal loading is present. This blog post highlights aspects of a clamp connection analysis performed by Becht Engineering. The client had observed significant loss of bolt preload at several clamp connections installed in a refinery process unit where the fluid temperature regularly fluctuated by 700 o F. The client attempted to counteract the bolt preload loss by re-torqueing any bolts that showed a torque reduction from the initially applied torque only to find that, after a period during which thermal cycles occurred, the preload was again reduced. A typical clamp arrangement is seen in Figure 1 (with parts labeled). After reviewing the installation and service conditions, it was hypothesized that the cause of the bolt preload loss could be the differential thermal growth of the...
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Magnus Gustafsson

Re: Belleville Springs

Fran, No, we did not look at Belleville washers as part of this work. I do expect they would help, but I understand the preferred... Read More
Thursday, 04 April 2019 14:18
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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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