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shujauddin
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Join Date: Oct 2014
Posts: 4

Metal Multiple Disc Flexible Shaft Coupling

09/09/2016 1:34 PM

How many stainless steel discs and of what thickness should be used in a coupling between a 50 H.P., 1450 R.P.M. motor and a cooling tower fan 9 feet away. Also, what type of disc, a 4-hole or a 6-hole one should be used. Thank you.
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SolarEagle
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#1

Re: Metal multiple disc flexible shaft coupling

09/09/2016 2:07 PM

Why not go with variable frequency drive (VFD) and a low-profile, permanent magnet (PM), direct-drive motor that replaces all the mechanical components—such as gearboxes, drive shafts, disc couplings and existing motors....?

Out with the old...

In with the new...

http://www.pumpsandsystems.com/motors/january-2014-cooling-tower-motors-improve-reliability

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phoenix911
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#3
In reply to #1

Re: Metal multiple disc flexible shaft coupling

09/09/2016 2:23 PM

WHAT?, NO SCREEN above the fan.

It sound great, but..... the pictures you show are pretty clean. Any service is best done when its outside. We have cooling cells pushing 30 years old, the only maintenance for replacement is the packing... (most due to UV)...

The biggest issue I had, on a new unit was shaft alignment... So I ended up purchase a SKF Laser shaft alignment off of ebay and save the company of $7,500.00

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James Stewart
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#6
In reply to #3

Re: Metal multiple disc flexible shaft coupling

09/09/2016 4:43 PM

Not only no screen on large cooling tower fans found in generating plants, but much larger cowlings.

Then we move over to the somewhat recent last century natural draft towers with no fan! What a shocker!

Then there is the new cooling tower that uses the waste heat to generate up to 30% more power in a power generating plant, as a result of forming a vortex in the center, with the vortex extending upward for miles. Induced air spins small wind turbines, as this air picks up moisture and heat making it highly buoyant over ambient air.

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phoenix911
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#2

Re: Metal multiple disc flexible shaft coupling

09/09/2016 2:18 PM

I'm not sure what you are taking about. Discs?

There's a motor, jackshaft and gearbox under the fan. What discs are you talking about on the flexible shafting... or please clarify.

What makes your final alignment is basically where you position your motor.

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lyn
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#4

Re: Metal Multiple Disc Flexible Shaft Coupling

09/09/2016 3:04 PM

Ask these people: www.lovejoy-inc.com.

They can help you with your weird need. (Maybe)
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#5

Re: Metal Multiple Disc Flexible Shaft Coupling

09/09/2016 3:05 PM

The number recommended in the original equipment manufacturer's operation and maintenance manual! The configuration is in there too. <sigh>

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Codemaster
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#7

Re: Metal Multiple Disc Flexible Shaft Coupling

09/10/2016 4:04 AM

That doesn't make any sense. Try a lot harder!

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GW
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#8

Re: Metal Multiple Disc Flexible Shaft Coupling

09/10/2016 11:09 AM

There are many competing designs from different manufacturers.

The coupling is sized on HP and rated RPM (ie torque), and service factor (what overload through the coupling for starting).

I tend to go one size larger over than minimum recommended (do you build to just meet code, or do you conservatively over design). Our applications are often sized for "severe reversing duty" - but an entirely different application from yours.
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Codemaster (1); GW (1); James Stewart (1); lyn (1); phoenix911 (2); PWSlack (1); SolarEagle (1)

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