Page 9 - BuTech - Technical information

PRESSURE DROP CURVES

Theoretical Pressure Drop and Fluid Velocity vs Flow for BuTech 60
Medium and High Pressure Tubing (based on water)
50
To determine the expected pressure drop per foot of tube length:
1. Select the appropriate curves based on tube I.D. 40
2. Find system flow rate on X-axis and follow graph vertically until it
reaches the solid line corresponding with the tube I.D. System Pressure (KSI) 30
3. Move horizontally in the chart to read the pressure drop per foot on the 20
Y-axis.
4. Multiply this value by the total tube length to obtain total pressure loss. 10
5. Multiply value from step 4 by the compressibility correction factor from
the chart at the right to correct for system pressure above atmospheric.
To determine average fluid velocity, follow the same procedure except use 1.00 1.02 1.04 1.06 1.08 1.10
the dashed line. Compressibility Correction Factor 'C'

.062 .062 .083
50 50
V .125 V .188
e 40 e 40 .109 .203
.109
l P l P .109
.083 30
o S 30 .125 o S
c I c I
20 20
i D i D .188 .203

t 10 t 10
y y
0 0
.5 1 1.5 2 1 2 3 4 5
Flow Q (GPM) Flow Q (GPM)

50 50
V .359 V .516 .688
.312 .438
e 40 e 40 .562
l P l P

o S 30 o S 30
c I c I
20 20
i D i D
.312
.359 .516
t 10 t 10 .688
.438 .562
y y
0 0
5 10 15 20 10 20 30 40 50
Pressure drop Flow Q (GPM) Flow Q (GPM)
Unit length
P = psi/ft

Velocity:
V = ft/sec

Tech-09 Page Tech-9

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