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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.

ASTM B88 - Seamless Copper Water Tubes - Dimensions

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

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

Copper tube - Type K

Nominal Size (in)	Working Pressure (psi) Load Calculator!		Actual Burst Pressure (psi) Load Calculator!
Nominal Size (in)	Annealed	Drawn	Annealed	Drawn
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

BS 2871 - Copper Tubes - Dimensions and Working Pressures Table X, Y and Z

Copper tube - Type L

Nominal Size (in)	Working Pressure (psi) Load Calculator!		Actual Burst Pressure (psi) Load Calculator!
Nominal Size (in)	Annealed	Drawn	Annealed	Drawn
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

Nominal Size (in)	Working Pressure (psi) Load Calculator!		Actual Burst Pressure (psi) Load Calculator!
Nominal Size (in)	Annealed	Drawn	Annealed	Drawn
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

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Related Topics

Water Systems - Hot and cold water service systems - design properties, capacities, sizing and more.
Pressure Ratings - Pressure ratings of pipes and tubes and their fittings - carbon steel , stainless steel, plastic, copper and more.

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