Post on 08-Aug-2015
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Designing of submarine ballast-Designing of submarine ballast-drainage centrifugal pump with low drainage centrifugal pump with low
noise & vibration levelnoise & vibration level
Ballast-Drainage System
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ContentContent
Piping & Instrumentation DiagramPiping & Instrumentation Diagram 44 Pump Unit PerformancePump Unit Performance 55 Impeller ProfileImpeller Profile 66 Impeller detail drawingImpeller detail drawing 77 Diffuser ProfileDiffuser Profile 88 General ArrangementGeneral Arrangement 99 Cross Sectional DrawingCross Sectional Drawing 1111 Dynamic Balancing of the Rotor AssemblyDynamic Balancing of the Rotor Assembly 1313 Researching PartResearching Part 1414 Balancing of Axial & Radial ForcesBalancing of Axial & Radial Forces 1717 Vibration & Noise ProtectionVibration & Noise Protection 1818 NPSHr ReductionNPSHr Reduction 1919
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Content (continuation)Content (continuation)
Impeller Fabrication MethodImpeller Fabrication Method 2020 Impeller MachiningImpeller Machining 2121 Adapter for Impeller MachiningAdapter for Impeller Machining 2222 Manufacturing CostsManufacturing Costs 2323 ConclusionsConclusions 2424
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Piping & Instrumentation DiagramPiping & Instrumentation Diagram
4 – Gate valve 5 – Ballast system piping 6 – Sea inlet 7 – Sluice valve 8 – Filter (mud box) 9 – Stop valves (switchgear)10 – Ballast pump11 – Drainage pump12 – Gate valve13 – Separator 14 – Hand pump15 – Protection cell16 – Drainage piping
1 – Suction filter2 – Mud box3 – Nonreturn valve
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Pump Unit PerformancePump Unit Performance
Head = 30m Capacity = 300m3/h NPSHa = 5m NPSHr = 0,7m Ns = 2935 Nssimpeller = 13010 Rated Power = 45,93kW E-motor Power = 55kW Speed = 1500rpm Efficiency = 55%
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Impeller ProfileImpeller Profile
Vanes profile
Velocity vector
diagram (outlet)
Velocity vector
diagram (inlet)
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Impeller detail drawingImpeller detail drawing
Balancing holes
Space vanes
Back wear ring design
88
Diffuser ProfileDiffuser Profile
Back vanes
Inlet
Outlet
99
General ArrangementGeneral Arrangement
Gap between pump casing and mounting surface
1010
General ArrangementGeneral Arrangement
Elastomer between pump casing supports and
mounting surface
1111
Cross Sectional DrawingCross Sectional Drawing
Sleeve bearings
Axial-vortex stage
Balance drum
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Cross Sectional DrawingCross Sectional DrawingProvisions for vibration
measurement
Junction box
Cable glands
1313
Dynamic Balancing of the Rotor AssemblyDynamic Balancing of the Rotor Assembly
1414
Researching PartResearching Part
Inducer Axial-Vortex Stage
NPSHr & Noise level
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Researching PartResearching Part
Inducer• Amount of back flow is bigger• Noise level is higher• NPSHr is higher
Axial-Vortex Stage • Amount of back flow is less• Noise level is lower• NPSHr is lower
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Researching PartResearching Part
NPSHr & Noise level 1 – Impeller 2 – Inducer 3 – Axial-Vortex Stage
First acoustical positive suction head
Second acoustical positive suction head
Net positive suction head (Head drop by 3%)
Net positive suction head (Head drop by 25%)
1717
Balancing of Axial & Radial ForcesBalancing of Axial & Radial Forces
Axial loadAxial load• Back impeller wear ringBack impeller wear ring• Impeller balancing holesImpeller balancing holes• Balancing drumBalancing drum• Rotor weight reductionRotor weight reduction
Radial loadRadial load• Diffuser designDiffuser design
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Vibration & Noise ProtectionVibration & Noise Protection
Static balancing of rotate partsStatic balancing of rotate parts Dynamic balancing of the rotor assemblyDynamic balancing of the rotor assembly Sleeve bearingsSleeve bearings Low number of revolutionsLow number of revolutions Low NPSHrLow NPSHr Gap between pump casing and mounting Gap between pump casing and mounting
basebase Elastomer between casing supports and Elastomer between casing supports and
mounting basemounting base Flexible suction & discharge transition Flexible suction & discharge transition
pieces pieces
1919
NPSHr ReductionNPSHr Reduction
Using of Axial-Vortex StageUsing of Axial-Vortex Stage Reducing number of revolutionsReducing number of revolutions Increasing impeller eye squareIncreasing impeller eye square
2020
Impeller Fabrication MethodImpeller Fabrication Method
Casting Rotary machining (CNC unit) Turning
Turn broaching Turning Radial drilling
2121
Impeller MachiningImpeller Machining
Radial drilling
Rotary machining (CNC unit) Turn broaching
2222
Adapter for Impeller MachiningAdapter for Impeller Machining
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Manufacturing CostsManufacturing Costs
C1 – Material cost C2 – Buy-out cost C3 – Factory overheads C4 – Salary for involved employees
C1 = 43,7% C2 = 21,3%
C3 = 11,6%
C4 = 8,7%
C5 = 5,8%C6 = 3,6%
C7 = 2,3%
C8 = 3%
C5 – Equipment maintenance cost C6 – Shop overheads C7 – Social insurance for involved employees C8 – Out-of-process costs
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ConclusionsConclusions
Noise & Vibration Level ControlNoise & Vibration Level Control Weight & Overall Dimensions ControlWeight & Overall Dimensions Control High ReliabilityHigh Reliability Manufacturing Cost ReductionManufacturing Cost Reduction Easy Maintenance & RepairEasy Maintenance & Repair InterchangeabilityInterchangeability Environment ProtectionEnvironment Protection