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Reg. 352

Copper Pipes

(a) The material shall comply with regulation 35.
b)

Copper pipes may be used for maximum design pressure and temperatures as given in the Table below:-

TABLE: Maximum Design Pressure and Temperature for Copper pipes

Material Nominal Maximum design
Pressure
Maximum design
temperature
Form
Solid drawn copper pipes (Steam)
Upto and
including
127mm
Above 127mm
and including
203mm
17.5
kg/cm2
12.3
kg/cm2
207°C
207oC
Straight or Bend
Solid drawn copper pipes (feed) Upto and
including 203mm
21 kg/cm2 149°C  

 

c) Copper pipes shall not be used for superheated steam.
d)

The maximum working pressure on such pipes shall be deter-mined by the following formula:-

WP = 200 x S x t Eqn.(93)
D - t

where,

WP = working pressure in kg/mm²
t = minimum thickness of tubes, that is nominal thickness less the permissible negative tolerance in mm.
D = outside diameter of pipe in mm.
S = maximum permissible design stress at the appropriate maximum design temperature in kg/mm²

(See the Table below)

Maximum Design Stress Value of S for Copper pipes (in kg. per sq. mm)

Maximum design stress for temperature not exceeding
66°C 121°C 149°C 177°C 207°C
4.9 4.31 3.5 2.66 1.75

Note: Where the conditions of services are such that corrosion, erosion or mechanical damage to the surface of tubes may occur, an appropriate thickness allowance shall be added to the minimum thickness of the tube.

 
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