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Harvey13, Assuming you have a cross flow cooling tower (open hot water basins up near the fan level) all you need to do is make sure you have a few inches (4-5") of water over the nozzles & make sure the hot water basins are completely flooded. The only head pressure you need is to 1. get the...

The fan should be up to full speed in about 2 seconds. Would the addition of a soft starter help? & thanks for all your comments.

The fan is rated in excess of 250HP so I am not concerned about the acceleration. Would a slower trip breaker be enough to make it through start up?

We have an application where an owner wants to use a 250HP motor to drive a cooling tower fan but he wants to keep his current switchgear that was rated for a 200HP motor. We can pitch the fan so that it does not require more then 200hp from the motor but is this going to work?

Thanks for all of your comments. It's a new installation & very clean so concerns about damaged equipment yet. The vibration increases from about 0.2 in/sec to 0.8 in/sec over a few minutes time. The fan is 24' in diameter driven by a right angle gear, a 100" drive shaft (composite) and a...

edison123, You raise a good point. We considered the natural frequency of the motor frame & the support assembly but we have not had a chance to test it out. The coast down was too quick to check with the equipment we had so there could still be the bump you describe. We have seen resonante...

Jraef, Thank you for your response. I should have mentioned before that we have locked out the mechanical vibration (we beleive). We have identified areas of the mechanical vibration due to the natural frequencies of the components involved and we have done vibration testing that supported...

We have a problem with a set of Toshiba H7 series model number VT130H7U415KB varaible frequency driving a sereis of 150HP Toshiba motors on an induced draft cooling tower. The motors run fine through the full 1800 rpm speed except for one area right around 650rpm - 750rpm where the motors begin...

Is there any rule of thumb or guidelines for determining the mounting or base plate thickness for electric motors and gear reducers? We design the supports for large induced draft cooling tower fans (12-40' in diameter). The fans are horizontal and driven by right angle gear reducers which...