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Steel Tubes - Working Pressures vs. Size

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The working pressures below are conservative estimates. Be aware that domestic rules may give lower limits.

For full table with Steam/Air Welded Connections - rotate the screen!

Steel Tubes - Working Pressure vs. Size
Nominal boreWaterSteam / Air, screwed connectionsSteam / Air, welded connections
LightMediumHeavyMediumHeavyMediumHeavy
inchesmmpsikPapsikPapsikPapsikPapsikPapsikPapsikPa
1/4 8 150 1000 300 2000 350 2400 150 1000 175 1200 250 1750 300 2000
3/8 10 150 1000 300 2000 350 2400 150 1000 175 1200 250 1750 300 2000
1/2 15 150 1000 300 2000 350 2400 150 1000 175 1200 250 1750 300 2000
3/4 20 150 1000 300 2000 350 2400 150 1000 175 1200 250 1750 300 2000
1 25 150 1000 300 2000 350 2400 150 1000 175 1200 250 1750 300 2000
1 1/4 32 125 850 250 1750 300 2000 125 850 150 1000 200 1400 300 2000
1 1/2 40 125 850 250 1750 300 2000 125 850 150 1000 200 1400 300 2000
2 50 100 700 200 1400 250 1750 100 700 125 850 200 1400 300 2000
2 1/2 65 100 700 200 1400 250 1750 100 700 125 850 200 1400 300 2000
3 80 100 700 200 1400 250 1750 100 700 125 850 150 1000 200 1400
4 100 80 550 150 1000 200 1400 80 550 100 700 150 1000 200 1400
5 125 150 1000 200 1400 80 550 100 700 150 1000 200 1400
6 150 125 850 150 1400 60 400 80 550 125 850 75 1200
  • 1 psi = 1 lb/in2
  • 1 kPa = 1 kN/m2
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