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Table 3. Equivalent Feet of Pipe
(Due to Valve and Fitting Friction)
Copper Tube,
O.D., Type "L"
1
/2
5
/8
7
/8 1
1
/8 1
3
/8 1
5
/8 2
1
/8 2
5
/8 3
1
/8 3
5
/8 4
1
/8 5
1
/8 6
1
/8
Globe Valve (Open) 14 16 22 28 36 42 57 69 83 99 118 138 168
Angle Valve (Open) 7 9 12 15 18 21 28 34 42 49 57 70 83
90° Turn Through Tee 3 4 5 6 8 9 12 14 17 20 22 28 34
Tee - Straight Through
or Sweep Below .75 1 1.5 2 2.5 3 3.5 4 5 6 7 9 11
90° Elbow or Reducing
Tee (Straight Through) 1 2 2 3 4 4 5 7 8 10 12 14 16
Table 2.Pressure Loss of Liquid Refrigerants
(In Liquid Line Risers - Expressed in Pressure Drop, PSIG, and Subcooling Loss, °F)
Liquid Line Rise in Feet
10’ 15’ 20’ 25’ 30’ 40’ 50’ 75’ 100’
Refrigerant PSIG
°F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F
R12 5.4 2.8 8.1 4.2 10.7 5.4 13.4 6.9 16.1 8.3 21.5 11.3 26.9 14.3 40.3 22.4 53.7 31.0
R22 4.8 1.6 7.3 2.3 9.7 3.1 12.1 3.8 14.5 4.7 19.4 6.2 24.2 8.0 36.3 12.1 48.4 16.5
R502 4.9 1.5 7.3 2.2 9.7 3.0 12.1 3.7 14.6 4.5 19.5 6.0 24.3 7.6 36.4 11.5 48.6 14.8
R134A 4.9 2.0 7.4 2.9 9.8 4.1 12.3 5.2 14.7 6.3 19.7 8.8 24.6 11.0 36.8 17.0 49.1 23.7
R507, R404A 4.1 1.1 6.1 1.6 8.2 2.1 10.2 2.7 12.2 3.3 16.3 4.1 20.4 5.6 30.6 8.3 40.8 11.8
Based on 110
°
F liquid temperature at bottom of riser.