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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.
Reducing Coupling weights in Large Motor Driven Pumps
Monday, 17 December 2018
Pump Coupling Assembly
One of the major issues in designing large motor driven pump applications is minimizing the overhung weight on the pump rotor. Motor or gearbox drives are designed and sized independently of the driven unit. They are based on motor frame size and/or gearbox frame sizes and the drive component manufacturer has no information on the actual driven unit. In motors, the design of engineered motors is based on years of experience and rules of thumb. The motor rotor is significantly heavier than the pump rotor, thus requiring it to be much larger in diameter than the driven unit size to support the rotor weight and give an acceptable bearing surface area. It is not unusual for the motor output shaft size to be twice the input shaft size of the driven unit shaft. Size Matters The shaft size differences are basically a product of economics. It cost money for a motor...
Due Diligence - Making Rapid, Accurate Judgements
Monday, 10 December 2018
or " Kidnapped By My Own Business Team" A number of years ago I worked closely with an Operating Company Business Team and Mergers and Acquisitions group performing due diligence assessments. I often led these assessments and my input on reliability, maintenance, mechanical integrity and inspection was incorporated into a multi discipline team of legal, environmental, finance and operational experts. These assessments could be as long as six weeks to thoroughly evaluate an asset. The adventure I am about to describe was a lot different. My boss called me and asked me to come to his office right away. This was quite unusual for him unless my number came up for a random drug test. I went to his office immediately, closed the door and we started our meeting. He said, “ I need you to be in front of the corporate office at 6 AM tomorrow. Hopefully you will return...
ASME B31.3 - Substantive Changes in the 2018 Edition for Process Piping
Tuesday, 04 December 2018
In addition to the many clarifications, updated references to codes and standards, updates to basic allowable stresses, and added listed materials, there are several substantive changes to the 2016 Edition of ASME B31.3, Process Piping, which is scheduled to be issued mid-January 2019. These substantive changes are: Owner Added specific permission for the owner to designate a representative to carry out selected responsibilities required by this Code, and noted that the owner retains ultimate responsibility for the actions of the representatives. Flange Design Added the ASME B&PV Code Section VIII, Division 2, para. 4.16 flange calculation method as an acceptable way to design flanges for B31.3 applications. The Division 2 procedure considers pressure, gasket seating, and externally applied axial forces and net-section bending moments. Stress Intensification and Flexibility Factors Added specific references to ASME B31J-2017 as a resource for stress intensification and flexibility factors as an alternate to Appendix D. High Cycle Fatigue...
Rigging Points Of Attachment - A Critical Element of Heavy Lift
Monday, 03 December 2018
Rigging Points In Heavy Lifts Are Critical
Review of rigging attachments to the equipment being lifted have prevented lift failures. When planning major crane lifts we are very careful about confirming the crane foundation, rigging stability/capacity, and crane capacity. Are we taking enough time to analyze the points of attachment for the rigging? Becht Engineering Heavy Lift Division says “NO”. Our experience is that reviews of rigging points of attachment have identified critical flaws that may have resulted in dropped loads. In industry today, the load/vessel designers typically design the lifting lugs and trunnions at the same time. It is our experience that the owners of the equipment and the crane contractors are assuming these devices are properly designed and rated. It is a common practice that the crane contractor assumes responsibility for rigging above the points of attachment. Generally, the consensus is that trunnions and lift lugs are designed by others and they should be right. That...
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