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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.

Piping Vibration Screening Rule

It is useful to have a screening rule for evaluation of piping vibration in order to determine if the vibration is potentially harmful (can lead to damage or fatigue failure) or if it is simply a nuisance and can be accepted without doing a more detailed assessment or anything to mitigate it. A very useful screening rule is provided in ASME OM-3 , “ Requirements for Preoperational and Initial Start-up Vibration Testing of Nuclear Power Plant Piping Systems;” however, it is first important to understand when it is appropriate to use this rule. It is not uncommon to have people use tools they are familiar with to address problems the tools are not suited for, yielding meaningless results. To understand where the OM-3 screening rule is applicable, it is useful to understand different categories of piping vibration. The first division is transient versus steady state. The screening rule is for steady...
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Ten Questions That Must Be Answered Before Attempting Any Lift

When attempting any lift, regardless of how small or seemingly insignificant, there is some basic information that must be known and confirmed before you begin. As an industry, we do a great job planning critical and super lifts. These major lifts are executed with precision and are successful if the plan is carefully followed. We don’t do as well on the everyday routine or standard lifts. In most cases there is little or no planning - and when things go wrong - accidents result . In my experience, the majority of crane accidents result from lifts that are classified as standard when in fact there is nothing standard about any lift. There are ten questions that must be answered for any lift.  This list should be considered as the basics, i.e., a lift plan for standard lifts. The ten questions can be converted into a simple lift plan form. Then, require...
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New ASME PCC-1 Qualification Procedures for Flange Joint Assemblers

For quite some time now, Section VIII Division 1 of the ASME Boiler & Pressure Vessel Code has included the following provision in Appendix 2-15: 2-15 QUALIFICATION OF ASSEMBLY PROCEDURES AND ASSEMBLERS. It is recommended that flange joints designed to this Appendix be assembled by qualified procedures and by qualified assemblers. ASME PCC-1 may be used as a guide. The "qualified procedures" reference is to Appendix A of PCC-1-2010 entitled "Notes Regarding Qualifying Flanged Joint Assemblers" and these notes cover slightly less than ½ page, with an Introductory Note stating that a proposed revision to this Appendix was under consideration by the ASME Pressure Technology Post Construction Committee. Well this "consideration" has come to fruition so that the updated Appendix A in the 2013 Edition of PCC-1 will include a replacement 20+ page Appendix A entitled: TRAINING AND QUALIFICATION OF BOLTED JOINT ASSEMBLY PERSONNEL. QUALIFICATION COMPONENTS There are three components outlined...
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Recent Comments
Guest — Simon Vaughan

Your thoughts...?

One way to remove variance from the make-up process is by sample testing of fastener extension using production processes, people ... Read More
Friday, 15 January 2016 11:02
Guest — Simon

Sample Verification of Fastene...

Clyde, do you have any thoughts on how the make-up of a flanged joint design could be qualified? Perhaps by a sample make-up of a... Read More
Tuesday, 12 January 2016 11:36
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Pump Trips and Check Valve Closure

Pump Trips and Check Valve Closure
Pump Trips and Check Valve Closure Systems running multiple pumps in parallel can undergo serious equipment and piping damage during a pump trip caused by a power outage or pump mechanical failure. Uncontrolled reverse flow in the system can occur and if improperly selected check valves are used it can result in pumps running backwards or transient pressure spikes in the system, i.e., water hammer. Water hammer will occur if reverse flow occurs prior closure of the check valve and the effect increases with higher reverse flow velocity. Becht has worked with clients on analysis of the design of their systems, e.g., a water treating facility running multiple 52,000 gpm pumps in parallel, a seawater pump station pumping cooling water through a several mile pipeline to an inland facility and a boiler feed water circulation system for a 3000 psig forced circulation boiler. In a three pump system (two operating and...
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