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PIPE SIZE
UNIT
SIZE
⅜
20
7.5
30
40
45
50
60
80
In calculating equivalent lengths of pipe runs, the effect of bends and fittings must be taken into account. The
table below covers fittings most likely to be encountered in this type of installation. The equivalent lengths of
all fittings in a particular pipe run must be added together and the total added to the actual length of pipe in
the run, in order to calculate its total equivalent length.
Use the shortest possible route, avoiding sharp bends.
Fully insulate both the suction and expansion lines, including the expansion device, since both lines may
sweat.
Fitting
45° Bend
90° Bend R/d = 1
90° Bend R/d = 1.5
180° Bend C/d = 1.5
180° Bend C/d = 2.5
90° Elbow
R = Radius of bend
MAXIMUM LENGTH OF EQUIVALENT
SUCTION LINE PIPE SIZES (m)
⅝
½
¾
23
45
15
45
10
36
45
10
36
45
7.5
18
45
14
36
45
11
30
45
FITTING LOSSES, in equivalent straight lengths of pipe (m)
Pipe Size (outside diameter in inches)
⅜
½
0.12
0.15
0.37
0.43
0.24
0.27
0.73
0.91
0.46
0.55
0.67
0.85
⅞
1⅛
1⅜
⅜
45
45
7.5
7.5
7.5
7.5
⅝
¾
0.18
0.21
0.49
0.55
0.30
0.37
1.10
1.28
0.64
0.76
1.04
1.25
d = Diameter of tube
C = Centres of bend
7/11
LIQUID LINE
⅝
½
¾
45
45
45
45
45
⅞
1⅛
0.24
0.3
0.61
0.79
0.43
0.52
1.46
1.83
0.85
1.07
1.46
1.89
54208007-06
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