Transcript Francis Turbine – L.O. Piping

MEP201
Mechanical Engineering Drawing
1st semester 2005-06
S R Kale
Lecture
Wiring Drawings
Wiring - Applications
 Power to equipment (grid, back-up) -
motors, generators, arc welding, furnace, lathe, A/C,
 Connecting computers or DAS  Power to computers, instruments, …
 Product wiring (industrial/consumer); –P-control
IC engine, CNC lathe, Robot, Injection molding m/c,
Aircraft (300 km), Automobile, Washing machine,…
 Illumination –
Domestic, Laboratory, Factory, Office,
 Plant –
Power plant, refinery, food processing, paper mill,
 Safety - fire
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Wiring drawings
Input information
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Schematic, P&I drawings
Equipment G.A. drawings
Layout drawings
Logic for interlocks
Wiring outputs
• Wiring schematic/diagram
• Wiring/Cable routing (to scale, with BoM)
Teams of
Electrical, I & C, civil, engineers
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Types of wiring
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Power supply and transmission
I & C signal
Telephone
Data cables
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Wiring - Construction
Conductor
• Copper and Cu -alloys
• Aluminum
• Optic fiber
Sheath (insulation, protection, mechanical strength)
• Plastic, PVC
• Armored
• Fabric
Diameter, single-multi core, strand, bend-radius
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Wiring  Piping
Similar methodology
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Schematic  Line diagram
Use G.A. of equipment + layouts
Prepare routing drawing - 3-D or plan-elevation
Provide supports and joints
Get Bill of Materials
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Types of wiring diagrams
• Wiring schematic (One-line diagram)
Power connections
• Control system diagram
• Interlock wiring / Sequence control wiring
• Data bus
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Power
Power Supply - available at one location.
Power Demand – supply to each equipment.
A.C.
No. of phases: 1 or 3
Voltage: 240, 415 V; 3.3, 11, 25, 220, 400, 600 kV
Frequency: 50 or 60 Hz.; 400 Hz
D.C.
± 3, 5, 6, 9, 12, 14, 24 V (cars, computers, TFT, instruments)
± 1500 V, 500 kV (HVDC)
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Wiring Elements
Wires / Cables
Devices
Switch, Fuse, Meters, Relays, Circuit breakers, …
Equipment
Consuming: Lamp, T/L, motor, heater, …
Production: Generator, battery, SPV, …
Transmission: Transformer, converter, …
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Domestic wiring
E
L
N
M
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Domestic Wiring
ARCHITECTURAL DRAWING/LAYOUT
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Domestic Wiring
MCB
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Industrial wiring
3 phase, 440 V or more, R-Y-B
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Circuit breakers
Relays
Motor starters
Switchgear
Cable size
Transformers
CT, VT
Panel with meters
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Industrial wiring
Layouts and routing (similar to piping)
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Cable trench
Cable tray
Cable gallery
Towers
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Industrial wiring
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Wiring – Haywire
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Missing wires mid-way through construction
Long routing of wires – extra cost
Interference with equipment, piping and structure
Wrong type of cables
Not enough space to lay cables or provide bends
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Summary
Output of wiring diagrams:
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Cable sizes and lengths
Routing – cable gallery, cable trench designs
Relay room and cabinets
Electrical panels and cabinets
Switchgear
Scope of supply
Detailing for civil and mechanical works
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