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Flange Pressure Temperature Rating Table (ASME B16.5)

Flange pressure rating table for ASME B16.5 Group 1.1 materials, showing the maximum non shock working pressure for each class against temperature.

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Working pressure in bar g, Group 1.1

°CClass 150Class 300Class 600Class 900Class 1500Class 2500
−29 to 3819.651.1102.1153.2255.3425.5
5019.250.1100.2150.4250.6417.7
10017.746.693.2139.8233.0388.3
15015.845.190.2135.2225.4375.6
20013.843.887.6131.4219.0365.0
25012.141.983.9125.8209.7349.5
30010.239.879.6119.5199.1331.8
3259.338.777.4116.1193.6322.6
3508.437.675.1112.7187.8313.0
3757.436.472.7109.1181.8303.1
4006.534.769.4104.2173.6289.3
4255.528.857.586.3143.8239.7
4504.623.046.069.0115.0191.7
4753.717.434.952.387.2145.3
5002.811.823.535.358.897.9
5381.45.911.817.729.549.2
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Approximate working pressure in psig (converted from bar)

°CClass 150Class 300Class 600Class 900Class 1500Class 2500
−29 to 382847411481222237036171
502787271453218136356058
1002576761352202833795632
1502296541308196132695448
2002006351271190631765294
2501756081217182530415069
3001485771155173328884812
3251355611123168428084679
3501225451089163527244540
3751075281054158226374396
400945031007151125184196
42580418834125220863477
45067334667100116682780
4755425250675912652107
500411713415128531420
5382086171257428714

About this Table

Flange pressure rating table for ASME B16.5 Group 1.1 materials, showing the maximum non shock working pressure for each class against temperature.

Basis: ASME B16.5 Table 2 1.1 (Group 1.1: A105 forgings, A216 WCB castings, A515 70, A516 70, A350 LF2). Ratings in bar gauge; linear interpolation between temperatures is allowed.

How to use

  1. Find the design temperature row; interpolate between rows if needed.
  2. Read across to the flange class.
  3. The design pressure must not exceed the value shown.

Notes

  • Other material groups (for example stainless 2.1 or 2.2) have different ratings.
  • Carbon steel above 425 °C is subject to graphitisation limits; check the standard notes.
  • The psig table is converted from bar and may differ by a few psi from the US customary table.

Related tools

Flange Pressure Rating Chart ToolFree on instrumentationblog.inFlange Dimensions ChartFree on instrumentationblog.inMaximum Allowable Working PressureFree on instrumentationblog.in
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Frequently Asked Questions

What is the pressure rating of a Class 150 flange?

19.6 bar g at −29 to 38 °C for Group 1.1, falling to 13.8 bar g at 200 °C.

What is the rating of a Class 300 flange?

51.1 bar g at ambient for Group 1.1.

Can I interpolate?

Yes. ASME B16.5 allows linear interpolation between tabulated temperatures.

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