We have had failures from different pumps on different Busses. Each time we measure the Bus Voltage it is as near to 600V as I think you can be.
We had (1) other path we were chasing but it reached a dead end as the voltage at the motors, when working, was well enough to start this thing. From...
Thank-you all. I took a much needed vacation to refresh my mind from this.
Before I reply/go through your valued responses; an update:
As was stated by me earlier the motor was replaced with a fresh identical. I have come back to find out it has "intermittently" failed to cold start. Was...
Re-used meaning that frames, etal are being sourced by non-N.A. workshops are stripping old motors for parts and recycling for new purchases.
Posting an operational video of motor coupling to hear harmonic and see speed.
I hope it is able to be played.
Today is gone. Today was fun.
Tomorrow...
edison123
Will do when we have it splayed out in the shop; unfortunately too many irons in the fire at the moment.
Question for motor construction knowledgeable people;
Is it common for a N.A. OEM to source all their "structural" parts (frame, rotor shafts, etc.) re-used from Asia and just wind...
Update to all
- Mid April replaced motor with stock; same issue uncoupled (crawling speed/loud harmonic) then when coupled to load (LP Centr Pump direct coupling drive) it picked right up to sych no problem with no harmonic noise.
- Yesterday replaced motor had been shutdown for system...
Here it is until it blew the O/L.
Today is gone. Today was fun.
Tomorrow is another one.
Every day, from here to there,
funny things are everywhere. ~'Dr.' Theodor Geiselhttps://files.engineering.com/getfile.aspx?folder=c19d3317-4ab2-470d-8a13-9d31ee74d1ef&file=ZeroStart.jpg
I did these charts quickly so I may have messed the conversions.
Here are Torque, Current and Voltage taken at the JB Terminals next to the Motor during a loaded (not uncoupled) start.
(1) ZERO RPM Start
(2) HS Bump Start
Today is gone. Today was fun.
Tomorrow is another one.
Every day, from...
electricpete:
- Voltage is at the Terminal JB next to the motor as we didn't want to unwrap the lug terminal connection.
- Contactors are over 1000 ft away upstream.
- Currents do appear balanced
We've had (2) instances of "failure" so far; we have (2) other motor changes of the same...
Reply for all;
- This is a "new" purchase Toshiba motor. Did Toshiba re-use previous casings, etc. Unknown but likely.
- This is confirmed a 2 winding motor; 2 independent wye set-ups.
- It does run on "rundown" from a high speed start.
- That timing of this is what is confusing us...
Going ask question to move topic along;
Can bump/rundown starting of motor overcome effect of Crawling (7th Order Harmonic)?
Can the Crawling effect come into play after limited use say if a degradation/damage to the rotor occurs?
Can the Crawling effect disappear after manipulation/re-execute...
Could use some 3rd Party Expertise please.
New motor replacement for 30yr application (Circ Pump LP/HP); 60 Hz, 575V, 13.3/40 HP, 1200/3600 RPM, 17.5/37.4 FLC, Wye Motor
- In 30yr nary an electrical issue; only bearing failures.
- New motors run for ~9 months then 1200 RPM won't cold start; gets...
We have been having difficulty from our supplier concerning the anti-friction coating on our "reusable" grayloc rings. We use currently a Henkel (Acheson) Molydag formula.
In the past we were getting +120 clamps per ring before coating wear caused metal adhesion and now we're as low as 40 but...
The above is, in my opinion, the best part of project management.
It is an easy to understand line item to your resume for managers to understand.
"I mananged my project to finish 2 weeks early; Y# FTE x X$/hr x 2 weeks = Z $ to the bottom line."
When you are on a high profile "sexy" project...
CompositePro,
The OP's use of the valve is completely different than its designed use.
Correct me if I'm wrong but a 'spring' in a spring loaded check valve is to assist in the reseating, not to be used as a regulating device.
The arguement between BigInch and David is semantical at the sizes...
As per CSA B51 4.1.1 system registrations should be submitted and accepted with the authority prior to construction. That would mean you should have a number by now. You can't apply hydrotest pressure to something that is not registered. That would mean the TSSA rep can't witness anything...
KLee,
Your state safety inspection authority, or I guess in the US your insurance carrier's inspection authority. The gov't body regulating your pressure vessels and systems.
Your company's internal inspectors only do what they are told...the gov't's inspectors 'interpret' what the...
KLee,
What you need to do is to standardize the response with an 'official' agreement with the IA. That way your field workers don't have a question about it.
In general you want to assure yourself that you have weld integrity, the easiest way to do that is independent testing methodology.
When...
JL,
Us Canucks speak out of both sides of our mouth......wait I mean we say 'colour', 'aboot' and Cv all at the same time.
Today is gone. Today was fun.
Tomorrow is another one.
Every day, from here to there,
funny things are everywhere. ~'Dr.' Theodor Geisel
KLee,
This takes a discussion with your IA.
When you refer to "small maintenance repairs to piping" are you saying replacing components or weld repairs?
In my jurisdiction we apply our 'golden weld' agreement we have with the authority when welding a sub-assembly into an existing system. Hydro...
Ahhh to know the un-intrusive TSSA inspector/registrar. Damn you all non-nuclear crowd.
Bud,
By the letter of the regs you are dealing with system piping that is registered when you register the equipment skid. A drip leg in of itself isn't a fitting or a vessel.
Today is gone. Today was...
