September 2015

September 2015
This is an impressive bit of engineering work by Troy Feese at Engineering Dynamics Inc., successfully diagnosing an expensive equipment failure and then implementing the proper solution.
f you have a good application or success story involving the TorqueTrak instruments that you would like to share in this newsletter, please send it to me for consideration.
Thank you,

Bob Holden
International Sales


Case History: Motor / ID Fan System for Main Crude Unit at Refinery
By Troy Feese, P.E.
Engineering Dynamics Incorporated
San Antonio, Texas, USA
Engineering Dynamics Incorporated (EDI) performed a field test of an induced draft (ID) fan system at a refinery that was experiencing failures of couplings, flexible disc style. The fan is part of an atmospheric furnace that heats approximately 152,000 barrels of crude per day. The ID fan is driven by a 350 HP induction motor. The motor speed is controlled by a variable frequency drive (VFD) from 0 to 1200 RPM. The trouble began when the motor was changed out for one of similar electrical performance, but of different physical size.

The failure of the original flexible disc coupling consisted of a crack in the spacer, which appeared to originate at a bolt hole. Initially, plant maintenance was blamed for possibly over tightening the coupling bolts. The 45 degree angle of the crack in the coupling spacer is a typical indication of high torsional vibration.

To quantify the transmitted and dynamic torque in the coupling, a TorqueTrak 10K telemetry system from Binsfeld Engineering was used. The waterfall plot below shows a torsional natural frequency (TNF) of the system near 58 Hz, which was being excited by 1× electrical frequency of the VFD. This resulted in high dynamic torque in the coupling when operating the fan at 1000 - 1200 RPM.
Introducing the NEW TorqueTrak TPM2
Binsfeld Engineering is pleased to introduce the new TorqueTrak TPM2 torque and power monitoring system for rotating shafts. The all-digital system features a RS422 full-duplex interface with system setup and configuration via computer software (provided).
Like all Binsfeld Engineering torque telemetry systems, the TorqueTrak TPM2 does not require shaft modification or machine disassembly. Rugged and precise, the TorqueTrak TPM2 is available for shaft diameters from 0.75"(19mm) to 40 inches (1016mm) and is ideal for almost any torque and power evaluation project.

Click here for the TorqueTrak TPM2 Product Data Sheet.