198
Technical Resources
Tubing Reference Data
Which ID is best for your application? Refer to fow rates (using water as the
solvent) and tubing IDs below and the corresponding differential pressure
per 5-foot length.
These theoretical data are presented in psi with the bar equivalent in
parentheses, and were calculated using the formula presented to the right.
Tubing ID
Flow Rate
0.0025” 0.005” 0.007” 0.010” 0.020” 0.030” 0.062”
0.1 mL/min.
923
58
15
4
0
0
0
(64)
(4.0)
(1.0)
(0.3)
(0)
(0)
(0)
1.0 mL/min NR*
577
150
36
2
0
0
(40)
(10)
(2.5)
(0.1)
(0)
(0)
2.0 mL/min NR*
1,154 300
72
5
1
0
(80)
(21)
(5.0)
(0.3)
(0.1)
(0)
10.0 mL/min NR*
5,770 1,502 361
23
5
0
(398)
(103)
(25)
(1.6)
(0.3)
(0)
25.0 mL/min NR* NR*
3,755 902
56
11
0
(259)
(62)
(3.9)
(0.8)
(0)
*Not Recommended - Exceeds the pressure rating of the tubing.
Differential Pressure Per 5–Foot Length
P =
(
9.86 x 10
-8
)
(
F L V
)
d
4
Where:
P = pressure drop in psi V = viscoscity in centipoise (cp)
F = fow rate in mL/min d = tubing inside diameter in cm
L = tubing length in cm
(See table to the left for data calculated using this formula.)
Theoretical Pressure Drop Along a
Length of Tubing
Tubing Internal Diameter (d) in inches to Linear Volume (µL/inch):
12870.4 (d
2
)
Tubing Internal Diameter (d) in µm to Linear Volume (µL/cm):
7.85 x 10
-6
(d
2
)
Internal Diameters
Linear Volumes
Inches Wire Gauge* Millimeters Microns
µL/in
µL/cm
0.0008 —
0.020
20
0.008
0.003
0.001 —
0.025
25
0.013
0.005
0.002 —
0.051
51
0.051
0.020
0.0025 —
0.064
64
0.081
0.032
0.003 —
0.076
76
0.116
0.046
0.004
36
0.102
102
0.206
0.081
0.005
35
0.127
127
0.322
0.127
0.006 —
0.152
152
0.463
0.182
0.007
34
0.178
178
0.631
0.248
0.008
33
0.203
203
0.824
0.324
0.009
32
0.229
229
1.042
0.410
0.010
31
0.254
254
1.287
0.507
0.012
30
0.305
305
1.853
0.730
0.014
28
0.356
356
2.523
0.993
0.015 —
0.381
381
2.896
1.140
0.018
26
0.457
457
4.170
1.642
0.020
25
0.508
508
5.148
2.027
0.028
22
0.711
711
10.090
3.973
0.030 —
0.762
762
11.583
4.560
0.032
21
0.813
813
13.179
5.189
0.040 —
1.016
1016
20.593
8.107
0.042
19
1.067
1067
22.703
8.938
0.046 —
1.168
1168
27.234
10.722
0.055 —
1.397
1397
38.933
15.328
0.062 —
1.575
1575
49.474
19.478
0.080
14
2.032
2032
82.370
32.429
0.093 —
2.362
2362
111.316 43.825
0.120
9
3.048
3048
185.333 72.966
0.125 —
3.175
3175
201.099 79.173
* Wire Gauge numbers are referencing Birmingham or Stub’s Iron Wire Gauge values, which are
commonly used by most stainless steel syringe manufacturers.
Tubing Internal Diameters and Volumes
FOR ORDERING & DISTRIBUTOR INFORMATION +1 800 426 0191 • +1 360 679 2528 • www.idex-hs.com