Make no mistake; this is a high-risk activity. Carefully evaluate your egress options should you need them. Many older cone roof tanks only had one roof entry point. If your entrant is working 100’ feet away from this point and needs to be retrieved, you’re in serious trouble. Dragging the...
At the facility I work in the practice is strictly forbidden; no exceptions. You don’t mention what type tanks you have or the product you are dealing with in the tanks. You reference API 2026 so I assume you are in the petrochemical business and dealing with tanks containing hydrocarbon...
Vibration? I have seen two instances of this.
One was a 75 MVA arc furnace transformer that tripped occasionally when a large overhead crane ( located in the same building ) rolled by.
The second was a large auto-transformer located near railroad tracks that tripped on several ocassions when a...
What could possibly generate heat after the power is removed?
Obviously, no additional heat will be generated within the transformer once it is de-energized. However, I submit that, for example, the inner core of this shell form power transformer is operating at a higher temperature than the...
Electricpete asked:
“How long do we have to restore cooling IF we lose all cooling while operating at 100% load”?
If you lost all pumps and fans on the unit in question and tripped the unit at the same time I believe in the minutes and hours that followed the trip you would experience...
Don't even think about this! If something goes wrong and you can't restore the cooling system components in, I would think less than a minute, you would be forced to trip the unit off line. The ramifications of this would be tough on the career.
Transformer oil is not the greatest conductor of...
Thanks for the replies.
The application will have some involved calculations but I can handle this easily with VB6. The Access DB will basically store numbers, not much else. The target audience will all be running MS Windows operating systems.
I guess my problem is this: Why spend the time...
I have been asked to develop a fairly complex desktop database application. The application will not require any interaction with the WWW. I will likely use a Microsoft Access database. I have a number of years experience with C and VB6 software development.
What are the disadvantages of...
One factor you need to consider is switching frequency. Many EAF have a high switching frequency (>50 operations per day). If your furnace transformers are in this category then switch the transformers with a vacuum contactor installed between the transformer and the circuit breaker. See...
