This document contains water pressure drop adjustment calculations for the evaporator and condenser piping of a cooling system. It lists pipe dimensions, flow rates, temperatures and other parameters to calculate the maximum pressure drop corrections of 2.013 feet for the evaporator piping and 2.778 feet for the condenser piping. Similar calculations are provided in metric units for a second system with maximum corrections of 2.433 kPa for the evaporator and 3.133 kPa for the condenser.
This document contains water pressure drop adjustment calculations for the evaporator and condenser piping of a cooling system. It lists pipe dimensions, flow rates, temperatures and other parameters to calculate the maximum pressure drop corrections of 2.013 feet for the evaporator piping and 2.778 feet for the condenser piping. Similar calculations are provided in metric units for a second system with maximum corrections of 2.433 kPa for the evaporator and 3.133 kPa for the condenser.
This document contains water pressure drop adjustment calculations for the evaporator and condenser piping of a cooling system. It lists pipe dimensions, flow rates, temperatures and other parameters to calculate the maximum pressure drop corrections of 2.013 feet for the evaporator piping and 2.778 feet for the condenser piping. Similar calculations are provided in metric units for a second system with maximum corrections of 2.433 kPa for the evaporator and 3.133 kPa for the condenser.
This document contains water pressure drop adjustment calculations for the evaporator and condenser piping of a cooling system. It lists pipe dimensions, flow rates, temperatures and other parameters to calculate the maximum pressure drop corrections of 2.013 feet for the evaporator piping and 2.778 feet for the condenser piping. Similar calculations are provided in metric units for a second system with maximum corrections of 2.433 kPa for the evaporator and 3.133 kPa for the condenser.
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Water Pressure Drop Adjustment Calculations - ref: 550/590 appendix G
Evaporator Piping
Press Drop Correction (ft)
Upstream Pipe, Water Temperature (F)
Flow Tube Inside Diameter at Static Pressure Measurement Location (inches) Contraction or Enlargement Section (if included - allowed for unit connections > 4") Elbow Section (if included - allowed for unit connections > 4")
54 13.25 included included
Flow Rate (gpm)
Length (of straight pipe) Upstream Dia (in) ID (inch) =>
5000 14 13.25 13.25
(inches) 15.25 Dwnstrm Dia (in) r/d or mitre=> 2 x 45 mitre
0.031 0.074 0.886
Downstream Pipe, Water Temperature (F)
Inside Diameter at Static Pressure Measurement Location (inches) Contraction or Enlargement Section (if included - allowed for unit connections > 4") Elbow Section (if included - allowed for unit connections > 4")
44 13.25 included included
Length (of straight pipe)
Upstream Dia (in) ID (inch) =>
14 15.25 13.25
(inches) Dwnstrm Dia (in) 13.25 r/d or mitre=> 2 x 45 mitre
0.032 0.093 0.897
* Maximum Pressure Drop correction for the Evaporator (ft H2O) =
Condenser Piping
2.013
Press Drop Correction (ft)
Upstream Pipe, Water Temperature (F)
Inside Diameter at Static Pressure Measurement Location (inches) Contraction or Enlargement Section (if included - allowed for unit connections > 4") Elbow Section (if included - allowed for unit connections > 4")
85 13.25 included included
Flow Rate (gpm)
Length (of straight pipe) Upstream Dia (in) ID (inch) =>
6000 14 13.25 13.25
(inches) Dwnstrm Dia (in) 15.25 r/d or mitre=> 2 x 45 mitre
0.043 0.107 1.229
Downstream Pipe, Water Temperature (F)
Inside Diameter at Static Pressure Measurement Location (inches) Contraction or Enlargement Section (if included - allowed for unit connections > 4") Elbow Section (if included - allowed for unit connections > 4")
95 13.25 included included
Length (of straight pipe)
Upstream Dia (in) ID (inch) =>
14 15.25 13.25
(inches) Dwnstrm Dia (in) 13.25 r/d or mitre=> 2 x 45 mitre
0.043 0.134 1.222
* Maximum Pressure Drop correction for the Condenser (ft H2O) =
2.778
* Note: The pressure drop adjustment is limited to 10% of the pressure drop reading Notes: 1) Length (of straight pipe) - the straight pipe length of the flow tube section between the static pressure taps and the unit connection. Do not include any lengths associated with an elbow or expansion/contraction section. 2) r/d or mitre - The worksheet calculates an adjustment for various 90 degree elbow fittings. r/d = is the turn radius of the elbow divided by the inside diameter. Mitre type elbows are allowed for mitres <= 45 degrees.
Water Pressure Drop Adjustment Calculations - ref: 551/591 appendix G
Press Drop Correction (kPa)
Evaporator Piping Upstream Pipe, Water Temperature (C) Flow Tube Inside Diameter at Static Pressure Measurement Location (mm) Contraction or Enlargement Section (if included - allowed for unit connections > 100mm) Elbow Section (if included - allowed for unit connections > 100mm)
12 200 included included
Flow Rate (l/s)
Length (of straight pipe) Upstream Dia (mm) ID (mm) =>
60 800 200 200
(mm) 250 Dwnstrm Dia (mm) r/d or mitre=> 2 x 45 mitre
0.120 0.202 0.901
Downstream Pipe, Water Temperature (C)
Inside Diameter at Static Pressure Measurement Location (mm) Contraction or Enlargement Section (if included - allowed for unit connections > 100mm) Elbow Section (if included - allowed for unit connections > 100mm)
7 200 included included
Length (of straight pipe)
Upstream Dia (mm) ID (mm) =>
800 250 200
(mm) 200 Dwnstrm Dia (mm) r/d or mitre=> 2 x 45 mitre
0.122 0.173 0.916
* Maximum Pressure Drop correction for the Evaporator (kPa) =
Condenser Piping
2.433
Press Drop Correction (ft)
Upstream Pipe, Water Temperature (C)
Inside Diameter at Static Pressure Measurement Location (mm) Contraction or Enlargement Section (if included - allowed for unit connections > 100mm) Elbow Section (if included - allowed for unit connections > 100mm)
30 200 included included
Flow Rate (l/s)
Length (of straight pipe) Upstream Dia (mm) ID (mm) =>
70 800 200 200
(mm) Dwnstrm Dia (mm) 250 r/d or mitre=> 2 x 45 mitre
0.155 0.275 1.162
Downstream Pipe, Water Temperature (F)
Inside Diameter at Static Pressure Measurement Location (mm) Contraction or Enlargement Section (if included - allowed for unit connections > 100mm) Elbow Section (if included - allowed for unit connections > 100mm)
35 200 included included
Length (of straight pipe)
Upstream Dia (mm) ID (mm) =>
800 250 200
(mm) Dwnstrm Dia (mm) 200 r/d or mitre=> 2 x 45 mitre
0.154 0.235 1.153
* Maximum Pressure Drop correction for the Condenser (kPa) =
3.133
* Note: The pressure drop adjustment is limited to 10% of the pressure drop reading Notes: 1) Length (of straight pipe) - the straight pipe length of the flow tube section between the static pressure taps and the unit connection. Do not include any lengths associated with an elbow or expansion/contraction section. 2) r/d or mitre - The worksheet calculates an adjustment for various 90 degree elbow fittings. r/d = is the turn radius of the elbow divided by the inside diameter. Mitre type elbows are allowed for mitres <= 45 degrees.
