Gates Belts & Applications - Tips and guidelines written by Gates Industrial Engineers

Estimating Horsepower Loads for Pumps

Friday, November 17, 2017

posted by Tony at 10:23 AM 0 comments

The power requirements for pumps should always be obtained from manufacturers if possible, but this may not always be feasible when quick field estimates are needed. The following equation can be used to estimate the power required to drive pumps:


Estimate the pump power requirement by dividing horsepower calculated above by the pump efficiency. An efficiency of approximately 70% can be used for centrifugal pumps, and approximately 80% for vane and gear pumps. Efficiency of reciprocating pumps can  vary significantly depending on pressure and stroke length.  Approximate efficiencies are included in the following table:


This approximation for pump power requirements can be used for quick estimations, or when accurate data cannot be obtained from pump manufacturers. For further information, or for assistance with a belt drive selection contact Gates Product Application Engineering at ptpasupport@gates.com or 303-744-5800.

BIRD™: Belt Installation and Rotation Device

Thursday, November 2, 2017

posted by Deen at 3:10 PM 0 comments

When you’re in charge of safety, you’re in charge of protecting people’s lives. Especially in highly volatile environments like oil drilling, mining, construction, and manufacturing. One small oversight could shut down your operation—and cost you millions in lost production, downtime, or even someone’s life. At Gates, we take safety seriously.


That is why Gates has introduced the BIRD™, the Belt Installation and Rotation Device, which is a switchable magnetic clamp equipped with permanent magnets and is designed for attachment (by hand) to metallic sheaves and sprockets.






The BIRD is a specially designed, tightly compacted device, which creates a magnetic field that develops an incredible attractive force on ferromagnetic materials.




And just as the BIRD is a tool for safety, Gates recommends practicing safety when using this device. The BIRD may only be used to rotate metallic sheaves and sprockets. Proper use includes adherence to the start-up, operating, environment, and maintenance conditions specified by Gates. The user bears sole responsibility for understanding this operating manual as well as for the proper use and maintenance of the BIRD.


Please contact Gates Product Application Support at 303-744-5800 or ptpasupport@gates.com if you have any questions prior to using this device.

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Calculating Proper Belt Length

We are often contacted to calculate the belt length of a specific drive given the center distance, and pulleys sizes are known.  Of course, we are glad to help in any way possible but if this calculation is needed after hours, or a phone is not readily available to you, it can be made through the equation below.

Where:
Lp = Belt pitch length (inches)
C = Center distance (inches)
D = Large pulley diameter (inches)
d = Small pulley diameter (inches)

For additional information on this or any other topic please contact Gates Product Application Engineering by phone at 303-744-5800 or by email at ptpasupport@gates.com.

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Not All Sprockets Have Flanges

Did you know that not all sprockets have flanges? In belt drive systems Gates typically only recommends the smaller sprocket to have flanges on both sides.  This is to account for any belt tracking issues that may occur if alignment between the sprockets is slightly off.  When misalignment becomes worse, the belt tends to track in one direction rather than remain neutral on the sprocket.

Flange Cutoffs

Belt
Grooves
8MM Poly Chain
90à
14MM Poly Chain
90à
2MM PowerGrip GT2
62à
3MM PowerGrip GT2
48à
5MM PowerGrip GT2
80à
5MM PowerGrip GT2 AL
36à
8MM PowerGrip GT2
90à
14MM PowerGrip GT2
90à
3MM PowerGrip HTD
50à
5MM PowerGrip HTD
36à
20MM PowerGrip HTD
112à
MXL
72à
XL
32à
L
60à
H
60à

Ventilation for Belt Drives

Increasing ventilation around belt drives can help reduce belt operating temperatures in applications with high ambient temperatures, or on applications operating in enclosures. This can be accomplished by adding vents to belt guards, by providing a cooler external air source, or by even adding fins to sheaves.

V-Belts and Low Temperature Operation

In extremely low temperature operations, the rubber material in V-belts becomes stiff. At sufficiently low temperatures, the rubber will actually reach a glass point, where (as the name implies) the rubber is hard and will shatter like glass if it is bent.

This is an extreme condition but approaching this state the rubber will go through various degrees of stiffness. As long as a drive is in operation, the heat generated through drive friction and bending will increase the internal belt temperature and maintain belt flexibility in temperatures well below the normally accepted minimum operating temperature. Trying to immediately transmit a load through a belt which has taken a cold set can cause belt failure because the belt is too rigid to bend.

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Options to Reduce Overhung Load on Gear Reducers and Gearboxes

If calculated overhung loads are larger than those recommended by a gearbox manufacturer, there are three possible options that can be used to reduce overhung load:

1) Increase the diameters of the sprockets or sheaves on the drive.
2) Move the sheave or sprocket inboard, thereby moving the overhung load closer to the reducer.
3) Use a belt type with a smaller overhung load connection factor (and, therefore, less total operating tension).

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