Drive Shafts

Cooling Tower Drive Shafts

With the increase in demand for higher torque capabilities for long span drive shafts, we have developed our composite drive shafts to serve challenging industrial needs. These are highly engineered, non-lubricated, single span, advanced composite drive shafts for superior load applications and rugged environments. This has only been possible through our rich experience in the cooling tower industry. NSCT Drive Shafts are excellent for industrial cooling tower applications providing the following features:

Inherent Corrosion Resistance

High Misalignment Capability

High Strength to Weight Ratio

Superior Fatigue Life

Smoother Operation

Easy Installation

Product Design

Central Carbon Composite Shaft is made from high modulus carbon fiber for additional longitudinal stiffness making long span drive shafts possible. This eliminates the need of having any intermediate bearing housing, thereby increasing the effectiveness of power transmission. Carbon Composite Flanges make use of continuous fiber placement technique where the fibers are placed at angles best suited for torque transmission. This further increases the stiffness required at the areas that come in direct contact with the driving bolts. Since Flanges are made from composites as well; they form an integral part of the central member making the assembly nearly indestructible. Flexi Discs make use of thin discs made from advanced composite materials for extremely high fatigue life. When unitized together, they offer low axial and angular restoring forces. They are further encapsulated with a microcellular urethane elastomer for its vibration dampening properties and protection from harsh cooling tower environments. Hubs/ Hardware are made from Stainless Steel 316 for superior corrosion resistance in acidic and saline water applications. * Hubs can be made available in K-500 Monel if requested for at the time of order.

Key Features and Advantages

High Stiffness to Weight Ratio The design exploits the high specific moduli of carbon composites making the whole assembly extremely light. This often eliminates the need of having a crane or any special lifting mechanism for on-site installations. Inherent Corrosion Resistance All materials are specifically chosen for cooling tower rugged conditions. The Shaft, Flanges and Flexible Couplings are made from composites while the Hubs and Hardware are made from SS-316, giving the drive shafts very high corrosion resistance. Specific additives further offer UV resistance to the equipment. Moreover, the lower number of components in our modular design reduces the chances of fretting corrosion. Smoother Operation Composites have a higher dampening capacity and hence offer lesser vibrations and noise. This helps increase the operational life of other connected mechanical equipment. Higher Misalignment Capabilities The drive shafts are capable of withstanding higher angular misalignments, more than 1o for each flexi disc. Easy Mounting and Dismounting The robust design and smaller number of parts, makes them easier to be installed on-site. Longer Bearing Life The lightweight design reduces the over hung loads on the motor and gear box bearings thereby increasing their life. Long Spans Higher stiffness of the composite shafts provides for longer spans without the need of any intermediate

bearings.

Dimensional Stability The lower coefficient of thermal expansion of superior composites that are used results in higher dimensional stability of the drive shaft resulting in reduced stresses, vibrations and increase in service life. Independent of Direction of Rotation The drive shafts are designed to rotate in both directions and so are well suited for reverse operation as well. Designed to Your Specifications Each Drive shaft is designed to our customers application and requirements. This enables us to deliver the right product with a very high service life. Highly Engineered Design The unitized flexible disc couplings are made from composites with an infinite theoretical fatigue life. The use of flexible thin composite discs, results in lower restoring forces. They are further encapsulated with a layer of polyurethane for rugged cooling tower conditions. The composite flanges make use of continuous fiber placement, resulting in very high flange stiffness. The fibers are placed at angles best suited for torque transmission.

Our Core Values Quality: We lay great emphasis on reducing product downtime through our vast engineering experience and skills. We continually upgrade our quality through the application of Lean Manufacturing and Six Sigma methodology . Using the best available material combined with the most advanced manufacturing technology, we at NSCT come up with solutions that really work. Upon request (i) Test Certificate of Material; (ii) Certificate of Balancing and (iii) Certificate of Conformance can be provided for every NSCT Drive Shaft. Customer Support and Services: NSCT has been in the Cooling Tower business since 1989 and we really understand our customer needs. Even failure of a small mechanical component can lead to major production losses. In case of any emergency, our highly skilled support team always remains ready to be deployed to any location at all times. Lead Time: Even tough, each drive shaft assembly is made to order and is designed exactly as per the customers requirements, we offer optimum lead time. Orders can be further expedited when requested. Pricing: We focus on offering our customers the best Value for Money. This is achieved through using the most optimum Product Design, Materials and Manufacturing. All these attributes combined with the Utility and Service Life of the product, make NSCT Drive Shafts the best-in-class.

Weight Comparison Carbon Fiber Composites Drive Shafts weigh less than one third of an equivalent metallic drive shafts. This is possible because of very high specific stiffness of the material.

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0

20

40

60

80

Carbon Fiber S Glass E Glass Steel

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Material Comparison

Table 1, Engineering Data and Dimensions:

Table 2, Torque and Moment of Inertia:

Models Continuous Torque @ 1.0 SF

Continuous Torque @ 2.0 SF

Peak Overload Torque

Axial Capacity per End

Weight @ min. DBSE

Moment of Inertia (WR2) @ min. DBSE

Weight Change per Length

Moment of Inertia (WR2) Change per length

NSCF 50 610 (5399) 305 (2700) 915 (8098) 0.775 (0.031) 5.82 (12.80) 0.0103 (35.17) 1.12 (0.0630) 0.0012 (0.1008)

NSCF 75 1090 (9647) 545 (4823) 1635 (14471) 0.85 (0.033) 10.10 (22.22) 0.0254 (86.91) 1.61 (0.0899) 0.0034 (0.2928)

NSCF 100 1640 (14515) 820 (7257) 2460 (21773) 1.00 (0.039) 13.97 (30.73) 0.0505 (172.57) 2.06 (0.1154) 0.0071 (0.6192)

NSCF 150 2850 (25224) 1425 (12612) 4275 (37837) 1.15 (0.045) 16.77 ( 36.89) 0.0665 (227.37) 2.99 (0.1680) 0.0178 (1.5447)

NSCF 200 3440 (30446) 1720 (15223) 5160 (45700) 1.25 (0.049) 21.10 (46.42) 0.1092 (373.09) 5.25 (0.2942) 0.0664 (5.7643)

Units of Measure

Nm (lb-in) Nm (lb-in) Nm (lb-in) mm (in) Kg (lb) Kg-m2 (lb-in2) Kg-m (lb-in) Kg-m2/m (lb-in2/in)

* All design data is subjected to change without prior notice.

The standard weight and moment of inertia values are calculated at the minimum drive shaft DBSE with minimum bore sizes for a complete assembly.

Models Max. DBSE @1500 rpm

@ 1.2 SF

Max. DBSE @1800 rpm

@ 1.2 SF

Max. Bore Size Min. Bore Dia.

A B

C D Min. DBSE Standard Oversized Standard Oversized

NSCF 50 2975 (117.13) 2730 (107.48) 42 (1.65) 60 (2.36) 24 (0.94) 138

(5.43) 62 (2.44) 82 (3.23)

67 (2.64)

60 (2.36)

178 (7.01)

NSCF 75 3586 (141.18) 3295 (129.72) 60 (2.36) 70 (2.76) 33 (1.29) 165

(6.49) 80 (3.15) 95 (3.74)

96 (3.78)

65 (2.56)

214 (8.43)

NSCF 100 3995 (157.28) 3698 (145.59) 70 (2.76) 80 (3.15) 47 (1.85) 190

(7.48) 92 (3.62) 105 (4.13)

122 (4.80)

65 (2.56)

242 (9.53)

NSCF 150 4675 (184.06) 4290 (168.89) 75 (2.95) 90 (3.54) 60 (2.36) 190

(7.48) 105 (4.13) 125 (4.92)

160 (6.29)

70 (2.76)

256 (10.08)

NSCF 200 5610 (220.87) 5295 (208.46) 80 (3.15) 100 (3.94) 60 (2.36) 190

(7.48) 115 (4.53) 135 (5.32)

232 (9.13)

70 (2.76)

260 (10.24)

Units of Measure

mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in)

mm (in)

mm (in)

* All dimensional data is subjected to change without prior notice.

Maximum DBSE is based on a minimum safety factor of 1.2 for critical speed as per common practises for composite Drive Shafts.

Bores and Keyways are designed as per ANSI/AGMA 9112--A04.

Mass Elastic properties and other characteristics are based on ANSI/AGMA 9104--A06.

(i) OAL: Over All Length (ii) DBSE: Distance Between Shaft Ends (iii) PAL: Pipe Assembly Length

Continuous Drive Torque is calculated as follows:

Where, Where, TCont. = Driving Torque (Nm) TCont. = Driving Torque (lb-in) P = Motor Power (KW) P = Motor Power (HP) N = Drive Shaft Speed (RPM) N = Drive Shaft Speed (RPM) Total Weigh of a Drive Shaft Assembly

Locate a particular drive shaft model in Table 1.

Note its minimum DBSE from Table 1.

Note its weight at min. DBSE from Table 1.

Note the corresponding Weight Change per Length from Table 2.

Subtract the required DBSE from min. DBSE and multiply it with the Weight Change per Length.

Add the last with its Weight at min. DBSE. Total Moment of Inertia of a Drive Shaft Assembly

Locate a particular drive shaft model in Table 1.

Note its minimum DBSE from Table 1.

Note its Moment of Inertia at min. DBSE from Table 1.

Note the corresponding Moment of Inertia Change per Length from Table 2.

Subtract the required DBSE from min. DBSE and multiply it with the Moment of Inertia Change per Length.

Add the last with its Moment of Inertia at min. DBSE.

Each NSCT Drive Shaft is rigorously test for its performance before dispatch.

Dynamically Balanced as per AGMA 9000-D11, Class-9.

Tested at 3 times the continuous torque on our Torque Testing Machine.

Each drive shaft is checked for its Critical Speed on our specially designed Speed Testing Rig.

Total Drive Shaft Assembly Weight = [(Required DBSE - min. DBSE) X Weight Change per Length] + Weight at min. DBSE.

Total Moment of Inertia = [(Required DBSE - min. DBSE) X Moment of Inertia Change per Length] + Moment of Inertia at min. DBSE.

WARRANTY

NSCT warrants the end user that the product will be free from defects in material or workmanship, under

normal use and service for a period of one year or otherwise longer in case the warranty period is extended at

the time of sale.

If a user discovers that the product is unable to conform to its requirements within the warranty period, then it must swiftly notify the seller in writing. NSCTs obligation under this warrant shall be, at NSCTs option and expense, to either (i) repair the defective part or product, or (ii) deliver the user an equivalent part or product to replace the defective product, or (iii) if neither of the two aforementioned options are reasonable, NSCT may, in its sole discretion, refund the user the purchase price paid for the defective product. All products replaced under this scheme will become property of NSCT. NOT COVERED UNDER WARRANTY

The warranty shall be void in case the product is not installed, operated, maintained and serviced as per NSCTs requirements or subjected to operation loads higher than the published limits. The warranty does not cover damage resulting from (i) improper use, abuse or accident; (ii) modifications, tampering or alterations to the hardware; (iii) abnormal operation conditions or application beyond the product specifications; (iv) repair by the user or any third party with written consent from NSCT. DISCLAIMER OF WARRANTY

Under no circumstances shall NSCT be liable for any incidental, special or consequential damages or loss, including, without limitation, lost profits or the inability to use equipment, whether such damages are based upon a breach of express or implied warranties, breach of contract, negligence, strict tort, or any other legal theory. The information provided in this catalog contains technical specifications for performance which in case of actual use

may not always apply as published or which may change as a result of further development of the products. An

obligation to provide the respective information shall only abide if expressly agreed in the terms of contract. NSCT

reserves the right to change technical specifications without prior notice.

Cooling Tower Drive Shaft Application Form

Company: Date:

Name: Location:

Telephone: E-mail:

DBSE: Quantity:

Motor Specifications

Motor Power:

Motor speed:

Motor Frame Size:

Motor Shaft Diameter:

Keyway Size:

Gear Box Specifications

Fan Specification

NSCT Composite Drive Shafts are designed to directly replace an existing metallic or composite drive shaft of any

make, for any cooling tower application.

North Street Cooling Towers Pvt. Ltd. C- 14, Sector- 22, Meerut Road Indl. Area, Ghaziabad- 201003, U.P. India

Ph: +91-120-2788571-72, Fax: +91-120-2788574

E-Mail ID: [email protected] / [email protected]

Website: www.nsctpl.com

Reduction Ratio:

Input Shaft Diameter:

Keyway Size:

Fan Diameter:

Fan RPM:

Number of Fan Blades:

An ISO 9001:2008 Certified Company