Operation
Table 2: Hose Selection by Pressure Drop
| Pressure drop in psi | Pressure Drop in bar |
Hose ID | (per 50 ft section per 1,000 | (per 15.24 meter section per |
(in.) | cps at 1 gal/min.) | 1,000 cps at 1 liter/min.) |
|
|
|
1/8 | 55,910 | 1,018 |
|
|
|
3/16 | 11,044 | 201 |
|
|
|
1/4 | 3,494 | 64 |
|
|
|
3/8 | 690 | 13 |
|
|
|
1/2 | 218 | 4 |
|
|
|
5/8 | 89 | 1.62 |
|
|
|
3/4 | 43 | 0.78 |
|
|
|
Reference Formula
Total Pressure Drop = P x V x L x F
Key:
P= | Pressure drop from chart |
V = | Viscosity in centipoise /1000 |
L= | Length of hose in feet / 50 |
F= | Flow rate in gallons per minute |
Example #1: What is the pressure loss of a 2,000 cps material through 150 ft of 3/8 in. ID hose at 0.75 gpm?
690 psi (from chart) x 2 (2,000 cps /1,000) x 3 (150 ft / 3) x 0.75 (gpm) = 3105 psi loss
Example #2: What is the pressure loss of a 2,000 cps material through 150 ft of 1/2 in. ID hose at 0.75 gpm?
218 psi (from chart) x 2 (2,000 cps /1,000) x 3 (150 ft / 3) x 0.75 (gpm) = 981 psi loss
This is a lot of pressure loss before reaching the spray gun. Continue to Example #2 which examines the same situation but with a 1/2 in. ID hose.
14 | 3A2988B |
