Effective Length Of Refrigerant Piping - Sanyo SGP-E70J2GU2 User Manual

Design

(4) Effective length of refrigerant piping

The effective straight length of the connectors used in the piping system is given in the table below. The piping system
design should be based upon this.
● Effective straight length of connectors (Table 3)
Intake pipe or thick
pipe (gas pipe)
90°elbow
45°elbow
Tees
Socket
U bend
(R60~100mm)
Trap bend
Branch pipe
Header pipe
Ball valve for service
● Effective straight length of bent pipe (Table 4)
R
45°bend
d
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
φ φ φ
Not necessary to calculate an effective length
Effective length
90°bend 180°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
φ φ
1
Calculation example
d: Outer diameter
R: Bend radius
(Example)
For a 19mm pipe bent through 90
from the table
length = 12.2 x 19 = 231mm
0.23 is the result.
D - 9
3. Refrigerant piping design
φ φ φ
o
on a 30mm radius (d=19, R=30)