Equivalent Length Of Refrigerant Piping - Sanyo SGP-EW120M2G2W Technical Data Manual

System Design

(5) Equivalent 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
D-11
3. 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 －= － =1.57
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
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
R 30
19
d
Units (m)
φ38.1
0.79
0.59
–
–
2.37
5.8