INTRODUCTION SBPT DIAPHRAGM COUPLING: FEATURES APPLICATION

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2 INTRODUCTION SBPT is an ISO 9001: 2000 certified company, specializing in Design and Manufactures of highly flexible Diaphragm Coupling since Advance analysis and manufacturing process have produced increased rating without reducing safety factors. The use of Torsional Vibration Analysis package has allowed for a more precise calculation on the drive system stresses. Flexible couplings are a vital part of mechanical power transmission system. Unfortunately some consider it a hardware only. It hardly costs 1% of the total system cost. And yet it can cause severe financial losses when improperly designed / selected or operated. SBPT has grown to be the largest Indian manufacturer of Flexible Diaphragm couplings. SBPT DIAPHRAGM COUPLING: The SBPT highly flexible Diaphragm Coupling is a fabric-reinforced rubber coupling with multidirectional flexibility. The use of synthetic fiber guarantees high strength. The coupling is used in applications where two approximately co-axially rotating machines have to be flexibly connected such as diesel engine and electric motor-driven equipment including marine propulsion systems, twobearing generators, compressors, pumps, fans, crushers, ball and rolling mills. FEATURES Sizes available to transmit up to 300 knm of torque Allows 3 25 degree torsional deflection Rupture torque 7 9 times of nominal torque Progressive dynamic torsional stiffness... increases with increasing torque Dampens torsional vibrations Provides precise systems tuning... several torsional stiffnesses are available for each coupling size. Accommodates misalignment. Absorbs shocks and attenuates noise. Rubber-in-shear design serves as a mechanical fuse to protect equipment from excessive torque overload Requires no lubrication / maintenance Available blind assembly and in single diaphragm designs Custom built designs available APPLICATION Land or sea, stationary or mobile, you will find SBPT Diaphragm Coupling powering a wide range of application such as Marine, Road Construction, Mining, Compressor, Locomotives and other equipments. No matter what application is, there is a reliable, SBPT Diaphragm Coupling ready to operate.

3 FIG. -1 Parts 1) Hub 2) Flanged Casing 3) Intermediate Ring 4) Inner Clamping Ring 5) Rubber Diaphragms 6) Outer Clamping Ring 7) Inner Clamping Screw 8) Inner screw 9) Outer Clamping Screw 10) Adapter Ring FIG. -2 CHARACTERISTIC CURVE SBPT DIAPHRAGM COUPLING : SERIES AVAILABLE 118 WITHOUT 111 WITHOUT Loco 118 WITH 130 WITHOUT 111 WITH 148 WITHOUT Blind Assembly 130 WITH 148 WITH Emergency drive is applicable for Marine application only.

4 CONVERSION FACTORS 1. Torque : (S.I. Unit - Nm) 1 knm = 1000 Nm = 738 lb ft.; 1 Nm = kpm = kpcm. 2. Force : (S.I. Unit - Newton) 1N = kp. = lb Moment of Inertia : (S.I. Unit - kgm ) 1 kgm = 8.85 lb in sec = kpcms 4. Power : (S.I. Unit - Watt) 1 W = HP; 1 PS = HP 5. Stiffness : (S.I. Unit - N/m) N/m = kp/m = kp/mm = lb/in 6. Torsional stiffness : (S.I. Unit - Nm/rad) 1 Nm/rad = kpcm/rad = kpm/rad = 8.85 lb in/rad SELECTION 1. Select the Service Factor S based on application from the Table. 2. Calculate Torque ( T ) in knm T = KW x 9550 x S / 1000 RPM or T = HP x x 9.86 x S / 1000 RPM 3. Select coupling size having Tnom > T 4. Check for maximum bore limit. If the maximum bore is exceeded, move to higher coupling size. 5. Check the RPM and select casing material. Guideline for Typical Service Factor S LOAD CLASSIFICATION Continuous service and low running load variation Torque loading varies during operation For medium shock loading or light reversing drive For heavy shock loading / reversing drive SERVICE FACTOR S WE ALSO INDEPENDENTLY DEVELOPED REPLACEMENT VULKAN EZ / EZS / EZR RUBBER ELEMENTS GUARANTEED TO PROVIDE EXCELLENT PERFORMANCE AT HIGHLYATTRACTIVE PRICES

5 SIZE SB / EZ Technical Data 45 S S S S S S S S S S S S S S S S S S S S S S S S S Tn- NOMINAL TORQUE The maximum torque capacity of a coupling on a continuous basis. Tmax - MAXIMUM TORQUE x Nominal Torque knm Tn Permissible Values Max. Torque KNm Tmax Vib. Torque KNm T v Static Torsional angle at Tnom In degree. CS Casing Permissible Maximum Speed RPM N CI Casing Permissible Displacement Axial mm. K a Deflection Stiffness Kp/mm. Dynamic Torsional Stiffness (X1000) in kpcm / rad The maximum torque capacity of a coupling (3 x Tn) during start-up, shutdown, shock loads, and transient conditions. Tv - VIBRATORY TORQUE The allowable vibratory torque capacity of a coupling at ambient coupling temperatures up to 60C. ANGULAR DISPLACEMENT The angular misalignment capacity of a Diaphragm Coupling is 1.0 degrees. - RELATIVE DAMPING The relative damping of a coupling element is the ratio of the damping energy converted to heat during a vibration cycle to the flexible strain energy of the element. The influence of vibratory amplitude and frequency on the relative damping factor can be neglected. Note: The superscript mark ' signifies the value has been derated; e.g., D R', P L', etc. = 1.13 for all sizes NOTE : * COUPLINGS ARE ALSO AVAILABLE WITH DIFFERENT TORSIONAL STIFFNESS VALUES. * For single Diaphragm Coupling - Torque and Dynamic Torsional Stifness values are Half. Radial mm. K r Axial C a Radial C r CTdyn at 25% Ctdyn at 50% Ctdyn at 75% CTdyn At 1`00% For Dimension : Please consult technical detail of SB / EZ type Diaphragm Coupling for Series 100, 110 & 140.

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