MEP201 Mechanical Engineering Drawing 1st semester 2005-2006

1
MEP201 Mechanical Engineering Drawing1st
semester 2005-2006

• S R Kale
• Lecture

General Arrangement (G.A.) Drawings
2
Background

• Schematic / PI drawings are available,
  equipment sizing and selection has been done.
• NEXT Need data on various equipment to integrate
  with one another.
• What data is needed? gt G.A. drawing.

3
Overall features

• About the manufacturer gt Title block
• Name plate rating
• Model no., Date of manufacture
• Ratings (capacity, design parameters)
• Working substance
• Electrical input/output
• Terminal points Scope of supply (items included
  or excluded)
• Related drawings

4
Mechanical dimensions

• Overall dimensions Maximum, moving dimensions,
  space during operation, space for maintenance,
  clear space,
• Movement space, rails,
• Mating pipe flanges locators, size, type
• Mechanical coupling Shaft locators, diameter,
  keyway size,
• Mountings flange mounting PCD, thread/hole,
  locator pins,
• Mounting locations base plate, mounting
  brackets, locations and sizes,

5
Civil dimensions

• Weights and forces
• Static loads
• C.G. locations
• Dynamic loads
• Speed
• Allowance for expansion,
• Foundation
• Location of holes for mounting bolts
• Size of foundation bolts

6
Handling requirements

• Weights
• C.G.
• Lifting points
• Location of holes
• Hook size
• Special devices for lifting
• DO NOT LIFT from ,

7
Electrical requirements

• Power requirements V, A, p.f., 1 or 3 phase
• Earthing requirements
• Load type reactive,

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G.A. Drawing of Motor
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G.A. drawings - Examples

• Examples of pump, chilled water system, Loco,

10
Slip-up (challenge!)

• Flanges dont match during erection
• Foundation bolts are off
• Piping and cabling become a jungle
• Inadequate capacity
• (e.g. HOT crane at Badagrah)
• Foundation dynamics are poor

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Lecture summary

• Make or procure G.A. drawing from the
  manufacturer/supplier, ask for more information
  if not given gt Integrate the information to make
  the plant.
• NEXT STEP Make plant design, O.K. for
  construction.