Sanyo SGP-EGW190M Technical Data Manual page 29

System Design
(5) Equivqlent length of refrigerant piping
The following table shows the equivalent straight piping length of connectors that may be used in the piping
system.
Table 3. Equivalent straight piping length of connectors
Inlet pipe or thick pipe
(gas pipe)
90º elbow
45º elbow
T-tee
Socket
U bend (R60 -100mm)
Trap bend
Branch pipe
Header pipe
Ball valve for service
Table 4.Equivalent straight piping length of bent pipe
R
d
45º bend
0.5 25.0×d
1.0 12.0×d
1.5 7.8×d
2.0 6.4×d
2.5 5.9×d
3.0 5.7×d
3.5 5.9×d
4.0 6.4×d
4.5 7.1×d
φ9.52 φ12.7 φ15.88 φ19.05 φ22.22
0.15 0.3
0.1 0.23
0.2 0.5
0.05 0.1
0.7 0.9
1.8 2.3
Not applicable to equivalent length calculation
Equivalent length
90º bend 180º bend
40.0×d 53.5×d
18.5×d 25.8×d
12.2×d 16.4×d
10.0×d 13.4×d
9.2×d 12.3×d
9.0×d 12.0×d
9.2×d 12.2×d
10.0×d 13.4×d
11.0×d 14.8×d
2. Refrigerant piping design
0.35 0.42 0.48
0.26 0.32 0.36
0.5 0.6 -
0.11 0.12 -
1.05 1.26 1.44
2.8 3.2 3.8
0.5
1
Calculation example
d: OD R: Bend radius
Example:
For a 19 mm dia. Pipe bent 90º with 30 mm radius
(d=19, R=30)
From the table,
Length = 12.2 x 19 =231 mm
The result is 0.23
D-8
φ25.4 φ28.58 φ31.75
0.52 0.57 0.7
0.39 0.43 0.53
0.8 0.9 0.9
0.14 0.16 0.18
1.56 1.71 2.1
4.3 4.7 5.0
30
R
- = - = 1.57
d
19
Units (m)
φ38.1
0.79
0.59
-
-
2.37
5.8