Search results

To those requesting a copy of my paper "Probabilistic Risk Assessment of ... Safety Systems", please be patient. I have had to arrange "electronic" reprint permission from the magazine. Regards, Phil Corso, PE [email protected] (Boca Raton, FL)

To List members interested in a criticizing viewpoint of TMR: Over the years I have published several papers comparing Safety Instrumented Systems. One topic addressed is called THE FALLACY OF TMR (yes, I'm shouting). The most current paper "Probabilistic Risk Assessment of Equipment Safety...

Jason, Please don't misunderstand this as a putdown, but obviously you have never had to deal with a legal issue. "Protection against lawsuits" is an oxymoron. The very best you can do is "pay" for liability insurance (the "errors and omissions" kind) in perpetuity. Of course the definition...

Have you tried: Laipac Techology (Canada) Tel: 905-762-1228 Fax: 905-770-6143 Email: [email protected] Contact: Diego Lai Regards, Phil Corso, PE (Boca Raton, FL)

Re: Gil<?> Thu, Jan 31, 2:17 pm, query: Rigid Metal Conduit (RMC) thread has a taper of 3/4 inch (19mm) per ft. NFPA 70 (NEC), Section 346, references standardd ANSI/ASME B.1.20.1-1983 Regards, Phil Corso, PE (Boca Raton, FL)

At ITT Technical Institute we use: "Process Control Instrumentation Technology" by Curti D. Johnson Published ny Prentice-Hall. 2000 ISBN 0-13-93800-3 Regards, Phil Corso, PE (Boca Raton, FL)

Johan, Once again you responded with a discourse on the regeneration method using an electronically augmented drive. If a VSD, then your repy has merit, If a soft-start, then the bypass contactor would preclude energy available from the drive. Regards, Phil Corso, PE (Boca Raton, FL)

Attn: Johan Bengtsson, reur Tue, Jan 8,12:21 reply: My disagreement is still with your explanation of how a disconnected motor, theoretically, provides "adequate" braking torque. Yes, upon interruption of power the load inertia is providing rotational torque. I also agree that there is residual...

Johan, see my reply to James Bouchard. Regards, Phil Corso, PE (Boca Raton, FL)

Responding to Aquilino Rodriguez's Thu, Jan 03, 9: 40am, query: Rules of thumb, repeat, rules of thumb, are: a) Star winding - connect dc excitation (+) to phase A and (-) to B or C. Set voltage so that Idc = 1.225 times rated Iac. b) Star winding - connect dc excitation (+) to phase A and...

James, I agree wholeheartily with the conclusion you presented regarding regeneration braking. However, the theoretical fact that overhauling is aways present does not necessarily mean that "braking" is effective. Certainly not in the three cases presented, i.e. 3/4 Hp radial saw, the 11 kW...

Welcome Johan: Sorry, but I must disagree with you one more time. Effective regeneration is only possible if the load "overhauls" the motor. Regards, Phil Corso, PE (Boca Raton, FL)

Responding to "Unknown's" Wed, Jan 2, 2002, 1:39pm, comments on the subject: Your observation of excessive plugging current (often thought to be 2 times starting inrush) is a fallacy. For simplicity, rated current at design speed is essentially determined by an impedance comprised of the both...

I guess there is nothing really new under the sun. This thread sounds like one about 2 years ago... "to PE or not to PE?" Except it's now "to IT, ET, or EE!" Happy New Year to all. Regards, Phil Corso, PE (Boca Raton, FL)

The application you note is often used to detect ignited flange leaks in LPG and LNG bulk loading loading facilities. Temperature detectors such as T/C and RTD are wrapped around piping flanges. Then if escaping gases ignite, the "blue-flame" fire is detected, and a water deluge system is...

Try University of Texas, Balcones Center for ElectroMechanics, in Austin. They developed a 10 million Ampere shunt with extremely low voltage drop. If I remember correctly it was about 100 mV. Regards, Phil Corso, PE (Boca Raton, FL)

Some preliminary questions: Bearing failure initiated by stray electrical currents flowing in shaft-bearing-machine path has a unique pattern. 1) Does such a pattern exist? 2) Does failure involve both bearings? 3) Are bearings sleeve-type or roller-type? 4) Is source to PWM controller...

Clone the main operator :-) Regards, Phil Corso, PE (Boca Raton, FL)

Responding to Dennis' Fri, Oct 5,2001, 9:32:am query: As you already found out, the service or S-factor will not provide you with a "redundancy" configuration. I suggest that you contact a belt manufacturer such as B.F. Goodrich Co. Regards, Phil Corso, PE (Boca Raton, FL)