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Copper Tubes Type K, L and M - Working Pressures vs. Size

ASTM B88 seamless copper water tubes - working pressures.

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Working pressure of copper tubes type K, L and M are indicated in the table below.

Ratings based on service temperature max. 150oF (66oC).

  • yield strength S = 5100 psi (35 GPa) for annealed
  • yield strength S = 10000 psi (69GPa) for drawn tube

Copper tube - Type K

Copper Tubes Type K - Working Pressures
Nominal Size
(in)
Working Pressure (psi) Actual Burst Pressure (psi)
AnnealedDrawnAnnealedDrawn
1/4 913 1796
3/8 960 1889
1/2 758 1490 4535 9840
5/8 626 1229
3/4 724 1424 4200 9300
1 557 1093 3415 7200
1 1/4 452 888 2800 5525
1 1/2 420 825 2600 5000
2 370 726 2235 3915
2 1/2 338 664 3575
3 328 643 3450
3 1/2 311 610
4 306 600 3415
5 293 575 3585
6 295 578 3425
8 314 615 3635
10 314 615
12 314 615

Copper tube - Type L

Copper Tubes Type L - Working Pressures
Nominal Size
(in)
Working Pressure (psi) Actual Burst Pressure (psi)
AnnealedDrawnAnnealedDrawn
1/4 775 1524
3/8 662 1302
1/2 613 1206 3885 7765
5/8 537 1055
3/4 495 972 2935 5900
1 420 825 2650 5115
1 1/4 373 733 2400 4550
1 1/2 347 682 2200 4100
2 309 607 1910 3365
2 1/2 285 560 3215
3 270 529 2865
3 1/2 258 506
4 249 489 2865
5 229 449 2985
6 213 418 2690
8 230 451 2650
10 231 452
12 215 423

Copper tube - Type M

Copper Tubes Type M - Working Pressures
Nominal Size
(in)
Working Pressure (psi) Actual Burst Pressure (psi)
AnnealedDrawnAnnealedDrawn
3/8 485 953
1/2 420 825 6135
3/4 346 680 4715
1 286 563 3865
1 1/4 287 565 3875
1 1/2 282 553 3550
2 254 499 2935
2 1/2 233 457 2800
3 215 423 2665
3 1/2 214 421
4 213 419 2215
5 198 388 2490
6 186 364 2000
8 195 382 2285
10 195 383
12 195 383
  • 1 N/mm2 = 106 Pa (N/m2) = 1 MPa = 10 bar = 1.020x105 kp/m2 = 102.0 m H2O = 9.869 atm = 145.0 psi (lbf/in2)
  • 1 in = 25.4 mm

astm b88 seamless copper tube K L M working pressure

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Related Topics

  • Pressure Ratings

    Pressure ratings of pipes and tubes and their fittings - carbon steel , stainless steel, plastic, copper and more.
  • Water Systems

    Hot and cold water service systems - design properties, capacities, sizing and more.

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