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jobba hemifrån kth Seamless & Welded Pipe

Barlows Formula:

Bursting Pressures: P = 2 x S x t
                                       D

P = Pressure Rating (MPa)
S = Minimum tensile strength (MPa) (S= 517MPa)*
t = Wall Thickness (mm)
D = Outside Diameter of Pipe (mm)

Nominal Working Pressures: figures shown in tables are nominal working pressures for seamless pipe under constant operating conditions. Where pressures or temperature fluctuations occur, increased safety factors should be adopted. Listed are factors of safety recommended for varying pressure conditions.

Apply
5 to bursting pressure for no pressure fluctuations
8 to bursting pressure for small/regular pressure fluctuations
12 to bursting pressure for small/regular fluctuations

* Tensile strength of 304 at room temperature

Note: the figures given for nominal working pressures and factor of safety are for quick reference purposes only. Detailed design calculations should be in accordance with the applicable design standard.

http://lactopur.com/?xrjak=sive-morten-analysis-forex-peace-army sive morten analysis forex peace army Conversion Table  
Megapascal 
Bar 10 
kgf/cm² 10.2
Kilopascal 1000
Hectopascal 10000
Millibar 10000
kgf/m² 101971.6
Pascal 1000000

 

Nominal Working Pressure Chart - General Austenitic Grades

(This chart is based on a nominal safety factor of 4 and applies to seamless pipe only)

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6 18 30.1 26.8 23.4 21.7 20.2 19.2 18.5 17.9 42.1 37.3 32.6 30.3 28.2 26.7 25.9 25.0 58.6 52.0 45.5 42.2 39.3 37.3 36.0 34.8
8 14 30.1 26.8 23.4 21.7 20.2 19.2 18.5 17.9 40.9 36.3 31.8 29.5 27.5 26.0 25.2 24.3 55.2 49.0 42.8 39.7 37.0 35.1 33.9 32.8
10 38 24.1 21.4 18.7 17.4 16.2 15.4 14.9 14.4 33.8 30.0 26.2 24.3 22.7 21.5 20.8 20.1 46.8 41.6 36.4 33.7 31.4 29.8 28.8 27.8
15 12 24.8 22.0 19.2 17.9 16.6 15.8 15.3 14.7 32.5 28.9 25.3 23.4 21.8 20.7 20.0 19.3 43.8 38.9 34.0 31.6 29.4 27.9 27.0 26.0
20 34 19.8 17.6 15.4 14.2 13.3 12.6 12.2 11.8 26.9 23.9 20.9 19.4 18.1 17.1 16.6 16.0 36.6 32.5 28.4 26.4 24.6 23.3 22.6 21.8
25 1 20.8 18.4 16.1 14.9 13.9 13.2 12.8 12.3 25.3 22.5 19.7 18.2 17.0 16.1 15.6 15.1 34.1 30.3 26.5 24.6 22.9 21.7 21.0 20.3
32 114 16.4 14.6 12.8 11.8 11.0 10.5 10.1 9.8 21.1 18.7 16.4 15.2 14.2 13.4 13.0 12.5 28.8 25.5 22.3 20.7 19.3 18.3 17.7 17.1
40 112 14.4 12.7 11.1 10.3 9.6 9.1 8.8 8.5 19.1 16.9 14.8 13.7 12.8 12.1 11.7 11.3 26.3 23.4 20.4 19.0 17.7 16.7 16.2 15.6
50 2 11.5 10.2 8.9 8.3 7.7 7.3 7.1 6.8 16.2 14.4 12.6 11.7 10.9 10.3 10.0 9.6 23.0 20.4 17.8 16.6 15.4 14.6 14.1 13.7
65 212 10.5 9.3 8.1 7.5 7.0 6.7 6.4 6.2 17.7 15.7 13.7 12.7 11.9 11.3 10.9 10.5 24.0 21.3 18.7 17.3 16.1 15.3 14.8 14.3
80 3 8.6 7.6 6.7 6.2 5.8 5.5 5.3 5.1 15.5 13.7 12.0 11.1 10.4 9.8 9.5 9.2 21.5 19.1 16.7 15.5 14.4 13.7 13.2 12.8
90 312 7.5 6.7 5.8 5.4 5.0 4.8 4.6 4.5 14.1 12.6 11.0 10.2 9.5 9.0 8.7 8.4 19.9 17.7 15.4 14.3 13.4 12.7 12.2 11.8
100 4 6.7 5.9 5.2 4.8 4.5 4.2 4.1 4.0 13.2 11.7 10.2 9.5 8.8 8.4 8.1 7.8 18.7 16.6 14.5 13.5 12.6 11.9 11.5 11.1
125 5 6.0 5.3 4.7 4.3 4.0 3.8 3.7 3.6 11.6 10.3 9.0 8.4 7.8 7.4 7.1 6.9 16.9 15.0 13.1 12.2 11.3 10.7 10.4 10.0
150 6 5.1 4.5 3.9 3.6 3.4 3.2 3.1 3.0 10.6 9.4 8.2 7.6 7.1 6.7 6.5 6.3 16.3 14.5 12.7 11.7 11.0 10.4 10.0 9.7
200 8 4.3 3.8 3.3 3.1 2.9 2.7 2.6 2.6 9.3 8.3 7.3 6.7 6.3 5.9 5.7 5.6 14.5 12.9 11.3 10.4 9.7 9.2 8.9 8.6
250 10 3.8 3.4 3.0 2.8 2.6 2.4 2.4 2.3 8.5 7.5 6.6 6.1 5.7 5.4 5.2 5.0 11.6 10.3 9.0 8.4 7.8 7.4 7.2 6.9
300 12 3.5 3.1 2.7 2.5 2.4 2.2 2.2 2.1 7.4 6.5 5.7 5.3 4.9 4.7 4.5 4.4 9.8 8.7 7.6 7.1 6.6 6.2 6.0 5.8

Nominal working pressures are shown in MPa
Nominal working pressures for welded pipe can be calculated by multiplying the figure in the tables by 0.85 (weld joint efficiency factor).