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29
Table 6 – Equivalent Lengths of Fittings
Line
Size
OD
inches
Equivalent Lengths of Refrigerant Pipe (feet)
Elbow
90°
Standard
Elbow 90°
Long
Radius
Elbow 90°
Street
Elbow 45°
Standard
Elbow 45°
Street
⅞
2.0
1.4
3.2
0.9
1.6
1
⅛
2.6
1.7
4.1
1.3
2.1
1
⅜
3.3
2.3
5.6
1.7
3.0
1
⅝
4.0
2.6
6.3
2.1
3.4
2
⅛
5.0
3.3
8.2
2.6
4.5
2
⅝
6.0
4.1
10.0
3.2
5.2
3
⅛
7.5
5.0
12.0
4.0
6.4
3
⅝
9.0
5.9
15.0
4.7
7.3
4
⅛
10.0
6.7
17.0
5.2
8.5
Liquid Line Sizing
The liquid line diameter should be as small as
possible while maintaining acceptable pressure drop.
This is necessary to minimize refrigerant charge. The
total length between the chiller unit and the air-
cooled condenser must not exceed 200 actual feet
(70.0 m) or 300 equivalent feet (91.4 m).
Liquid line risers in the system will require an
additional 0.5 psig pressure drop per foot of vertical
rise. When it is necessary to have a liquid line riser,
make the vertical run immediately after the
condenser before any additional restrictions. The
liquid line risers must not exceed 10 feet (3.0 m) in
height from the condenser liquid line connection
(see Figure 15). The liquid line does not require
pitching. Install a pressure tap valve at the condenser
to facilitate measuring pressure for service.
Liquid lines do not typically require insulation.
However, if exposing the lines to solar heat gain or
temperatures exceeding 110 °F (43.3°C), there is a
negative effect on sub-cooling. In these situations,
insulate the liquid lines.