Refrigeration and Air Conditioning Copper Pipe Size Chart

Standard Copper Tube

O.D. (inches)	Wall (inches)	Gauge (SWG)	Max Allowable Pressure (PS) in annealed condition at 100deg C (Barg)	Max Allowable Pressure (PS) in supplied* condition at 100deg C (Barg)
3/8”	0.032	21	93	108
1/2”	0.036	20	78	91
1/2”	0.048	18	102	118
5/8”	0.036	20	62	73
5/8”	0.04	19	67	79
5/8”	0.048	18	81	95
3/4”	0.036	20	51	61
3/4”	0.04	19	57	73
3/4”	0.048	18	65	77
3/4”	0.064	16	88	102
7/8”	0.04	19	46	55
7/8”	0.048	18	55	66
7/8”	0.064	16	75	88
7/8”	0.104	12	125	142
1.1/8”	0.048	18	43	51
1.1/8”	0.064	16	57	68
1.1/8”	0.08	14	72	85
1.3/8”	0.048	18	35	41
1.3/8”	0.064	16	47	55
1.3/8”	0.08	14	59	69
1.3/8”	0.104	12	77	90
1.5/8”	0.048	18	29	35
1.5/8”	0.064	16	39	47
1.5/8”	0.08	14	49	58
1.5/8”	0.104	12	65	76
1.5/8”	0.116	11	73	85
2.1/8”	0.048	18	22	27
2.1/8”	0.064	16	30	35
2.1/8”	0.08	14	37	44
2.1/8”	0.104	12	49	58
2.5/8”	0.048	18	18	25
2.5/8”	0.064	16	24	33
2.5/8”	0.08	14	30	41
2.5/8”	0.104	12	39	54
3.1/8”	0.064	16	20	28
3.1/8”	0.08	14	25	35
3.1/8”	0.104	12	33	45
3.5/8”	0.064	16	17	24
3.5/8”	0.08	14	22	30
4.1/8”	0.064	16	15	21
4.1/8”	0.08	14	19	26
4.1/8”	0.104	12	25	34

*Sizes 3/8 – 2 1/8” supplied in Half Hard, Sizes 2 5/8 – 4 1/8” supplied Hard

**Pressure rating as per BS 14276

Standard Copper Coiled Tube

O.D. (inches)	Wall (inches)	Gauge (SWG)	Max Allowable Pressure (PS) in annealed condition at 100deg C (Barg)
1/4	0.028	22	125
5/16	0.028	22	98
5/16	0.036	20	129
3/8	0.032	21	81
1/2	0.032	21	69
5/8	0.036	20	61
3/4”	0.040	19	54
7/8	0.040	19	46

ACR Working Pressures Data Sheet