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Reg. 579 c, Reg. 579 d

Plain tubes

 
In no case the thickness of straight tubes under external pressure shall not be less than as specified below:-

Tube outside diameter
(mm)
Minimum thickness
(mm)
Not exceeding 32 2.10
Exceeding 32 but not exceeding 39 2.28
Exceeding 39 but not exceeding 51 2.281
Exceeding 51 but not exceeding 70 3.12
Exceeding 70 but not exceeding 77 3.38
Exceeding 77 but not exceeding 89 3.96
Exceeding 89 but not exceeding 102 4.26

 




Reg. 579 d

Plain tubes


Internal Pressure: -

The thickness of tubes under internal pressure shall be calculated as under:

t = WP .D + C Equation XII/15
WP + 2f

Where,

WP = Internal working pressure, kg/cm² (g), and other symbols as per clarifications indicated at (a) above.

In no case the thickness of straight tubes under internal pressure shall not be less than listed below:

Tube outside diameter
(mm)
Minimum thickness
(mm)

Not exceeding 39

1.75
Exceeding 39 but not exceeding 51 2.16
Exceeding 51 but not exceeding 70 2.4
Exceeding 70 but not exceeding 77 2.6
Exceeding 77 but not exceeding 96 3.05
Exceeding 96 but not exceeding 102 3.28
Exceeding 102 but not exceeding 127 3.5
 
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