Log in

Login to your account

Username *
Password *
Remember Me

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.

Why do Clamped Connections With Metallic Seals Sometimes Leak?

cover-pipe-clamp
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...
Continue reading
3
  163 Hits
  0 Comments
163 Hits
0 Comments

Negotiating Plant Access for Due Diligence

just-the-fact_20190122-202155_1
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...
Continue reading
2
  98 Hits
  0 Comments
98 Hits
0 Comments

CFD Analysis with Scale Model Verification - A Proven Cost-Effective Approach

cover-image-blog-case1-2-streamline_20190115-200616_1
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...
Continue reading
3
  154 Hits
  0 Comments
154 Hits
0 Comments

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...
Continue reading
3
  173 Hits
  0 Comments
173 Hits
0 Comments