Appendix B: Dimensions of Pipe and Tubing

Table B.1: Dimensions of Heat Exchanger and Condenser Tubing

(a) The Birmingham Wire Gage Scale
BWG	Thickness (in.)
7	0.180
8	0.165
10	0.134
11	0.120
12	0.109
13	0.095
14	0.083
15	0.072
16	0.065
17	0.058
18	0.049
20	0.035
22	0.028
24	0.022
26	0.018
^[a]ID = OD 2 wall thickness from part (a) of table ^[b]Internal area = ( ?/4)(ID) ² ^[c]External surface per foot length = ?(OD/12)

(b) Tubing Dimensions
Tube OD (in.)	BWG	Tube ID ^[a] (in.)	Internal area ^[b] (in. ²)	External surface per foot length ^[c] (ft ²/ft)	OD/ID
1/2	16	0.370	0.1075	0.1309	1.351
	18	0.402	0.1269	0.1309	1.244
	20	0.430	0.1452	0.1309	1.163
	22	0.444	0.1548	0.1309	1.126
5/8	12	0.407	0.1301	0.1636	1.536
	13	0.435	0.1486	0.1636	1.437
	14	0.459	0.1655	0.1636	1.362
	15	0.481	0.1817	0.1636	1.299
	16	0.495	0.1924	0.1636	1.263
	17	0.509	0.2035	0.1636	1.228
	18	0.527	0.2181	0.1636	1.186
	19	0.541	0.2299	0.1636	1.155
	20	0.555	0.2419	0.1636	1.126
3/4	10	0.482	0.1825	0.1963	1.556
	11	0.510	0.2043	0.1963	1.471
	12	0.532	0.2223	0.1963	1.410
	13	0.560	0.2463	0.1963	1.339
	14	0.584	0.2679	0.1963	1.284
	15	0.606	0.2884	0.1963	1.238
	16	0.620	0.3019	0.1963	1.210
	17	0.634	0.3157	0.1963	1.183
	18	0.652	0.3339	0.1963	1.150
	20	0.680	0.3632	0.1963	1.103
7/8	10	0.607

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Process Heat Transfer: Principles and Applications