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Table 5. Equivalent Feet of Pipe Due to Valve and Fitting Friction
Copper Tuber, 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 4. Pressure Loss of Liquid Refrigerants in Liquid Line Risers
(Expressed in Pressure Drop, PSIG, and Subcooling Loss, ˚F).
Liquid Line Rise in Feet
10ʼ 15ʼ 20ʼ 25ʼ 30ʼ 40ʼ 50ʼ 75ʼ 100ʼ
Refrigerant PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F
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
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.