Metal finishing Q&As since 1989

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Factors to consider for new variator motor in galvanizing plant

I am an engineer working in a galvanizing plant.In order to improve the productivity, I would like to modify the existing pipe withdrawing variator motor. Can you suggest me what are the factors I have to consider in upgrading the variator motor thereby its speed and torque

Anup Sherif
Employee - Indian
February 11, 2009

How about price, availability, warranty, ease of repair, temperature that it will work in, corrosive environment that it will operate in, duty cycles, materials of construction and what the boss wants are only a few.

James Watts
- Navarre, Florida
February 12, 2009

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February 13, 2009

Sir:
I presume the motor you speak of is the one operating the magnetic pick-up rolls for pipe withdrawal. If this motor is too fast, you will withdraw a pipe full of zinc and then the steam blow will not be proper. Also the angle of withdrawal for the pipes (e.g. 11 deg, 15 deg, or 20 deg from horizontal) is quite critical. If the motor is too weak for withdrawing larger pipes then naturally, it will have to be made stronger. The magnetic rolls must also have enough magnetism to hold the pipes. Keeping the rolls clean and having an o.d. blow ring that does not collect molten zinc are also important. An o.d. blow ring using holes is far better than with a variable or fixed slot. In any endeavor it is important to define what you desire to do and what are your target parameters.
Regards,

Dr. Thomas H. Cook
Galvanizing Consultant - Hot Springs, South Dakota, USA