Procurement Of Main Drive Unit Speed Reducer Main Drive Unit Speed Reducer, NALCO CPP ANGUL-Odisha

Procurement Of Main Drive Unit Speed Reducer Main Drive Unit Speed Reducer , 5Apc Equivalent Main Drive Unit Speed Reducer . Type - Iii . Main Drive Unit Speed Reducer With Overrunning Clutch , Auxiliary Extention Shaft & Without Electrical/Air Motor And Couplings , For Air Preheaters Of Unit- 1 To 10 , Cpp , Nalco . Aph Model: 24 . 5 Vit 1450/1500 ( 72 Deg Pa Opening ) . Make:Apc/Seisa/Shanthi . Gear Box Model: 5 ApcDirection - One No To Be Supplied As Clockwise And One No As Counter Clockwise . Speed Ratio: 110:1Motor Rating: 7 . 5 Kw , 1440 Rpm , Approximate Oil Capacity: 50 LitresThe Main Drive Unit Speed Reducer Should Be Supplied In Ready To Fit Condition With All The Spares Attached . Design Features:1-The Gear Tooth Technology Shall Be As Per Standard Design And Conform Broadly To Din-3960 , & Din-3990 . 2-The Spiral Bevel Set Shall Be Case Hardened And Lapped In Set . The Helical Gear Sets Shall Be Case Hardened And Teeth Must Be Ground Finished . The Surface Hardeness Shall Be Maintained In The Range Of 56-60 Hrc . 3-The Gearbox Casing Shall Be Of Torsionally Rigid Construction With The Provision Of Inpection Cover For Viewing Of Gear Train . 4-The Bearings Shall Be Of Anti-Friction Type And Skf/Fag Make Only . The Over Running Clutch Shall Be Of Sprag Type And Without Oil Seals . 5-Lubricant: Servomesh Ee320 Of Indian Oil Corpn . Ltd/Equivalent Make . Material Of Construction & Heat Treatment:-1- The Gear Box Casing Shall Be Made Of Cast Iron Conforming To Fg-260 Is-210 , Duly Shot Blasted Before Machining2- The Gear Train Shall Be Made From Case Hardened Steel- Sae- 8620 / En-353 Specification . 3- Low Speed Shaft Shall Be Made Of C-45 Of Is 1570 Duly Normalised Condition . Inspection & Testing:-The Gear Box Must Be Tested During Functional Test Run Under No Load Condition At Your Works Prior To Despatch And During Functional Test Run , The Following Parametrs Are To Checked . ( I ) Shaft Arrangement , Direction Of Rotation , Reduction Ratio As Per The Drawing Or Order . ( Ii ) No Leakage From Joint Face , Caps , Covers Fittings . ( Iii ) Rise In Temperature Is 30 Dgree Centigrade Over The Ambient Temp . ( Iv ) Noise Level Within 80Db Measured At 1 Meter Distance From The Gearbox . ( V ) Vibration- A Normal Unfiltered Velocity Level Of 7 . 5 Mm/Sec . Is Permissible With A Maximum Displacement Of 50 Micron .

Sr No	CorrigendumDate	Corrigendum	CorrigendumType	NewSubmissionDate
1	04-01-2020	DATE EXTENSION	Date	10-01-2020
2	14-01-2020	DATE EXTENSION 2	Date	24-01-2020

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