MEP201 Mechanical Engineering Drawing 1 st semester S R Kale Lecture General Arrangement (G.A.) Drawings

G.A. & Layouts (2005)2 Background Schematic / P&I 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? => G.A. drawing.

G.A. & Layouts (2005)3 Overall features About the manufacturer => 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

G.A. & Layouts (2005)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,

G.A. & Layouts (2005)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

G.A. & Layouts (2005)6 Handling requirements Weights C.G. Lifting points – Location of holes Hook size Special devices for lifting DO NOT LIFT from …,

G.A. & Layouts (2005)7 Electrical requirements Power requirements – V, A, p.f., 1 or 3 phase Earthing requirements Load type – reactive, …

G.A. Drawing of Motor

G.A. & Layouts (2005)9 G.A. drawings - Examples Examples of pump, chilled water system, Loco, …

G.A. & Layouts (2005)10 Slip-up (challenge!)  Flanges don’t 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

G.A. & Layouts (2005)11 Lecture summary Make or procure G.A. drawing from the manufacturer/supplier, ask for more information if not given => Integrate the information to make the plant. NEXT STEP : Make plant design, O.K. for construction.