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Pressure

Pressure Rating ANSI Class Nominal Pressure PN Conversion








ISO 7268 norm defines Nomimal Pressure for pipe components. API 6D compares also ANSI Class with PN.

The pressure rating on this table do not mean design pressure (bar or psi). Factors such as temperature and material should be also considered in order to select a pressure rating.
ANSI
Class Rating
[#]
Nominal Pressure

PN


150 20
300 50
400 64
600 100
900 150
1500 250
2500 420




ASTM A312 Stainless Steel Pipe Theoretical Bursting and Collapsing Pressures for Pipe

Nominal
Size
Inches
Schedule
Number
Outside
Diameter
Inches
Wall
Thickness
Inches
Inside
Diameter
Inches
Internal
Pressure
PSI
Bursting
External
Pressure
PSI
Collapsing
1/8 10 0.405 0.049 0.307 18,150 7,468
40 0.405 0.068 0.269 25,195 10,761
80 0.405 0.095 0.215 35,185 15,441
1/4 10 0.540 0.065 0.410 18,055 7,425
40 0.540 0.088 0.364 24,444 10,415
80 0.540 0.119 0.302 33,055 14,445
3/8 10 0.678 0.065 0.545 14,380 5,705
40 0.678 0.091 0.493 20,132 8,397
80 0.678 0.126 0.423 27,876 12,021
1/2  5 0.840 0.065 0.710 11,607 4,407
10 0.840 0.083 0.674 14,821 5,911
40 0.840 0.109 0.622 19,464 8,084
80 0.840 0.147 0.546 26,250 11,260
3/4  5 1.050 0.065 0.920 9,285 3,295
10 1.050 0.083 0.884 11,857 4,524
40 1.050 0.113 0.824 16,142 6,529
80 1.050 0.154 0.742 22,000 9,271
1  5 1.315 0.065 1.185 7,414 2,445
10 1.315 0.109 1.097 12,433 3,795
40 1.315 0.133 1.049 15,171 6,075
80 1.315 0.179 0.957 20,418 8,530
1-1/4  5 1.660 0.065 1.530 5,873 1,725
10 1.660 0.109 1.442 9,849 3,585
40 1.660 0.140 1.380 12,650 3,895
80 1.660 0.191 1.278 17,259 7,052
1-1/2  5 1.900 0.065 1.770 5,131 1,376
10 1.900 0.109 1.682 8,605 3,002
40 1.900 0.145 1.610 11,447 4,332
80 1.900 0.200 1.500 15,789 6,364
2  5 2.375 0.065 2.245 4,105 896
10 2.375 0.109 2.157 6,884 2,196
40 2.375 0.154 2.067 9,726 3,526
80 2.375 0.218 1.939 13,768 5,418
2-1/2  5 2.875 0.083 2.709 4,330 1,001
10 2.875 0.120 2.635 6,260 1,905
40 2.875 0.203 2.469 10,591 3,931
3  5 3.500 0.083 3.334 3,557 639
10 3.500 0.120 3.260 5,142 1,375
40 3.500 0.216 3.068 9,257 3,307
3-1/2  5 4.000 0.083 3.834 3,112 431
10 4.000 0.120 3.760 4,500 1,081
4  5 4.500 0.083 4.334 2,766 315
10 4.500 0.120 4.260 4,000 845
40 4.500 0.237 5.345 7,900 2,672
5  5 5.563 0.109 5.295 2,949 350
10 5.563 0.134 6.407 3,613 665
6  5 6.625 0.109 6.357 2,467 129
10 6.625 0.134 3,033 394
NOTE: To compute safe working pressures, above burst pressures should be divided by your desired safety factor.


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316Ti Stainless Steel Tube
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321 321H Stainless Steel
347 347H Stainless Steel
904L N08094 Seamless Tubes
17-4 PH 630 UNS S17400 Stainless Steel
253MA S30815 Stainless Steel Tube
S31254 254 SMO Pipe
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2205 Duplex Pipe Tubing
S32101 Stainless Steel
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2507 Super Duplex Pipe
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1.4462 Stainless Steel Pipe
ASTM A213 | ASTM A269
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EN 10216-5
ASTM A789 ASME SA 789 S31803 S32205 S32101 S32750 S32760 S32304 S31500 S31260 Seamless Tubes
EN 10216-5 1.4462 1.4362 1.4162 1.4410 1.4501 Seamless Tubes
Nickel Alloy Tubing:

UNS N08020 Alloy 20 Tubing
UNS N02200 Alloy 200 Tube
UNS N02201 Alloy 201 Pipe
UNS N04400 Monel 400 Tubing
N06600 Inconel 600 Tube
N06601 Inconel 601 Tubing
N06625 Inconel 625 Tubes
N08800 Incoloy 800 Tube
N08810 Incoloy 800H Tube
N08811 Incoloy 800HT Tubing
UNS N08825 Incoloy 825 Pipe
ASTM B622 N10276 C276 Tubing
ASTM B622 N06022 Hastelloy C-22 Alloy Tubes
C28000 Brass Seamless Tubes C44300 Brass Seamless Tubes
C68700 Brass Seamless Tubes
C70600 Copper Nickel Tubes
C71500 Copper Nickel Tubes
DIN 2391 Seamless Precision Steel Tubes
EN 10305-1 E215 E235 E355 Seamless Precision Steel Tube Tubing Tubes
DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube