MEP201 Mechanical Engineering Drawing

1st semester 2005-2006

S R Kale

Lecture

Piping Drawings

Piping (2005) 2

Piping drawings

Pre-requisites• Schematic, P&I drawings• Equipment G.A. drawings• Layout drawings

Restrictions• Space (X, Y, Z), movement

Piping outputs• B.O.M. for piping fabricator• Hangers, anchors/foundations, trenches

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Francis Turbine – Lube Oil Piping (1)

L.O.TANK

BRG

L.O.TANK

BEARING

Z

X

Y

SCHEMATIC

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Information Requirements

• Position of each equipment(L.O. tank, Bearing block, pump : floor plans, elevations)

• G.A. drawing of each equipment(type, size & position of piping connections)

• Civil requirements(beams & columns, walkway, maintenance)

• Electrical requirements(panels, cable trenches)

• Other pipes in the area

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Piping Joints

ThreadedAccuracy (?), Metal/plastic. Plumbing

FlangedIndustrial pipes, low/medium pressure and temperature. Metal/Plastic. Steam, oil, water,

WeldedPermanent; High pressure and temperature. Industrial, Water, steam, oil, chemicals,

Water supply, sewage, large hydro - Concrete

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Piping Joints

Threaded / Flanged / Welded

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Piping Joints

Threaded / Flanged / Welded

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Pipe - Flanged connection

PIPE-FLANGEWELDED orSCREWED

PIPE 2

PIPE 1

FLANGE 1

FLANGE 2

GASKET

BOLT-NUT

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Pipe - Flanged connection

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Piping Joints

Threaded / Flanged / Welded

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Piping Joints

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Piping Bends

Tee (T) Short Radius (SR) Elbow

Long Radius (SR) Elbow

Radius/Pipe dia. ratio

Hydrodynamics.

Space.

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Piping : Vents, Drains & Supports

Vents : Location, accessibility, outletDrains : Location, accessibility,

collection, funnel,Supports : Anchor/foundation, hanger• Thermal expansion• Pipe weight• Surges, water hammer• Equipment vibrations• Seismic

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Francis Turbine – Lube Oil Piping (2)

L.O.TANK

BEARING

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Piping – Plan & Elevation (1)

ISOMETRIC

PLAN

ELEVATION

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Piping – Plan & Elevation (2)

ISOMETRIC

PLAN

ELEVATION

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Piping – Plan & Elevation (3)

ISOMETRIC

PLAN

ELEVATION

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Pipe supportsFoundation

Hanger

Rack

Clamp

Underground – foundation

“Rigid” - anchor vs. “flexible” allows pipe to move

All along pipe length (at regular intervals?)

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Pipe support - Hanger

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Piping Examples

Oil pumping station, Central A.C. system,

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Piping – How things go wrong

Power plant steam turbine – steam pipe under lube oil pipe.

Hostel – drinking water pipe and sewage pipe too close.

Automobile – brake oil leak on alternator. Pipes running into beams, columns, walls, … Pipe centerline O.K. (?) but insulation fouls

with walls/ceiling.

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Lecture summary

Using schematics/P&I diagrams make piping drawings (routing), to scale, with material and other specifications (e.g. standards)

NEXT STEP : Piece-wise design and manufacture of pipes, joining details, and their supports,