Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 72 views

    Line Sizing and Fluid Velocity

    Uploaded by

    nitantharani
    This document provides guidelines for properly sizing fluid lines in hydraulic systems. It discusses selecting line sizes based on fluid pressure and velocity, and includes charts showing appropriate velocity and pressure drop for different line sizes. Selecting correctly sized lines is important for system performance and component life, avoiding issues from under- or over-sizing. The document also includes formulas and examples for calculating fluid velocity in lines.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Line Sizing and Fluid Velocity

    Uploaded by

    nitantharani
    72 views3 pages
    This document provides guidelines for properly sizing fluid lines in hydraulic systems. It discusses selecting line sizes based on fluid pressure and velocity, and includes charts showing appropriate velocity and pressure drop for different line sizes. Selecting correctly sized lines is important for system performance and component life, avoiding issues from under- or over-sizing. The document also includes formulas and examples for calculating fluid velocity in lines.

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This document provides guidelines for properly sizing fluid lines in hydraulic systems. It discusses selecting line sizes based on fluid pressure and velocity, and includes charts showing appropriate velocity and pressure drop for different line sizes. Selecting correctly sized lines is important for system performance and component life, avoiding issues from under- or over-sizing. The document also includes formulas and examples for calculating fluid velocity in lines.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    72 views3 pages

    Line Sizing and Fluid Velocity

    Uploaded by

    nitantharani
    This document provides guidelines for properly sizing fluid lines in hydraulic systems. It discusses selecting line sizes based on fluid pressure and velocity, and includes charts showing appropriate velocity and pressure drop for different line sizes. Selecting correctly sized lines is important for system performance and component life, avoiding issues from under- or over-sizing. The document also includes formulas and examples for calculating fluid velocity in lines.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    You are on page 1of 3

    Line Sizing and Fluid Velocity http://www.rhmfp.

    com/tech-tips/161-line-sizing-and-fluid-velocity

    RHM Home > Tech Tips > Line Sizing and Fluid Velocity

    Line Sizing and Fluid Velocity


    Line size selection
    Selecting the proper line size for a hydraulic system is critical to get maximum performance and
    life from your hydraulic components. The four basic line types in a hydraulic system are: Pump
    suction, Return (Low pressure <100 PSI), Medium pressure (500 to 2000 PSI), and High Pressure
    (2100 to 5000 PSI). Under-sizing fluid lines will result in high pressure loss and system
    overheating. Over sizing lines increases the cost of the system. Lines should be sized as follows:

    Suction: 2-4 feet/sec.


    Return: 10-15 feet/sec.
    Medium Pressure: 15-20 feet/sec.
    High Pressure: 20-25 feet/sec.

    On extremely long lines the pressure drop through the pressure and return lines must be
    accounted for to insure sufficient pressure is available at the actuator.

    (See pressure drop charts included with this document).

    Fluid Velocity
    Velocity through a line can be calculated with the formula:

    Velocity = GPM x 0.3208


    Area
    Velocity = Feet Per Second (fps)
    GPM = Gallon per minute fluid flow
    A = Square inch inside area of conductor

    The Following velocity charts are a quick way to check velocity through a line. Included in the
    charts is the I.D. of the line. If the particular tube, pipe or hose you are using is not listed,
    reference a line with a similar I.D. for approximate velocity.

    Approximate Velocity in GPM – Schedule 40 Pipe

    Size I.D. 2fps 4fps 10fps 15fps 20fps


    3/8" 0.493" 1.2 2.3 5.9 8.9 11.9
    1/2" 0.622" 1.9 3.8 9.5 14.2 18.9
    3/4" 0.824" 3.3 6.6 16.6 24.9 33.2
    1" 1.049" 5.4 10.7 26.9 40.4 53.9
    1-1/4" 1.38" 9.3 18.6 46.6 69.9 93.2
    1-1/2" 1.610" 12.7 25.3 63.5 95.2 126.9
    2" 2.067" 20.9 41.8 104.6 156.9 209.2
    2-1/2" 2.469" 29.8 59.7 149.2 223.8 298.5
    3" 3.068" 46.1 92.1 230.4 345.6 460.8

    1 of 3 21-Jun-18, 5:22 PM
    Line Sizing and Fluid Velocity http://www.rhmfp.com/tech-tips/161-line-sizing-and-fluid-velocity

    4" 4.026" 79.4 158.7 396.8 595.2 793.6


    6" 6.065" 180.1 360.2 900.5 1350.7 1801

    Approximate Velocity in GPM – Schedule 80 Pipe

    Size I.D. 2fps 4fps 10fps 15fps 20fps 25fps


    3/8" 0.423" 0.9 1.75 4.4 6.6 8.8 11
    1/2" 0.546" 1.5 2.9 7.3 10.9 14.6 18.2
    3/4" 0.742" 2.7 5.4 13.5 20.2 27 33.7
    1" 0.957" 4.5 8.9 22.4 33.6 44.8 56
    1-1/4" 1.278" 8 16 40 60 80 100
    1-1/2" 1.5" 11 22 55.1 82.6 110.2 137.7
    2" 1.939" 18.4 36.8 92 138.1 184.1 230.1
    2-1/2" 2.323" 26.4 52.8 132.1 198.2 264.2 330.3
    3" 2.9" 41.2 82.3 205.9 308.8 411.8 514.7
    4" 3.826" 71.7 143.4 358.3 537.5 716.7 895.9
    6" 5.761" 162.5 325.1 812.5 1218.7 1624.9 2031.2

    Approximate Velocity in Tubing

    Size I.D. 2fps 4fps 10fps 15fps 20fps 25fps


    3/8" x .049 wall 0.277" 0.38 0.75 1.88 2.81 3.75 4.69
    1/2" x .064 wall 0.37" 0.67 1.34 3.35 5.03 6.7 8.37
    3/4" x .109 wall 0.532" 1.39 2.77 6.93 10.4 13.9 17.31
    1" x .120 wall 0.76" 2.83 5.65 14.1 21.2 28.3 35.33
    1-1/4" x .120 wall 1.01" 5 10 25 37.4 50 62.4
    1-1/2" x .120 wall 1.26" 7.77 15.5 38.8 58.3 77.7 97.12

    Pressure Drop
    Pressure drop through the conductor must be accounted for in long runs of pipe, hose or tubing.
    This will insure you have sufficient pressure available at your actuator to do work and sufficient
    horsepower available at the pump. You can use the following charts to estimate total pressure
    drop through a conductor based on fluid velocity. Included in the charts is the I.D. of the
    conductor, so if the particular tube or pipe you are using is not listed you can reference a
    conductor with a similar I.D. for approximate pressure drop.

    Fluid viscosity plays a very large part in calculating pressure drop through the system. The charts
    below are based on ISO grade 46 Hydraulic oil with a viscosity of approximately 225 S.S.U. at
    100°F and .88 specific gravity. Actual pressure drop will increase as viscosity increases.

    Approximate Pressure Drop (PSI) per 1 Foot of line length – Schedule 40 Pipe

    Size I.D. 2fps 4fps 10fps 15fps 20fps 25fps


    3/8" .493" 0.18 0.36 0.91 1.36 2.98 4.4
    1/2" .622" 0.11 0.23 0.57 1.35 2.23 3.29
    3/4" .824" 0.06 0.13 0.32 0.95 1.57 2.31
    1" 1.049" 0.04 0.08 0.34 0.7 1.16 1.71
    1-1/4" 1.38" 0.02 0.05 0.24 0.5 0.82 1.21
    1-1/2" 1.610" 0.02 0.04 0.2 0.41 0.68 1
    2" 2.067" 0.02 0.04 0.15 0.3 0.5 0.73
    2-1/2" 2.469" 0.01 0.03 0.12 0.24 0.4 0.59
    3" 3.068" 0.01 0.02 0.09 0.18 0.3 0.45
    4" 4.026" 0.01 0.02 0.06 0.13 0.22 0.32
    6" 6.065" 0.004 0.01 0.04 0.07 0.12 0.18

    Approximate Pressure Drop (PSI) per 1 Foot of line length – Schedule 80 Pipe

    Size I.D. 2fps 4fps 10fps 15fps 20fps 25fps


    3/8" 0.423" 0.25 0.49 1.23 1.85 2.46 5.32

    2 of 3 21-Jun-18, 5:22 PM
    Line Sizing and Fluid Velocity http://www.rhmfp.com/tech-tips/161-line-sizing-and-fluid-velocity

    1/2" 0.546" 0.15 0.30 0.74 1.11 2.62 3.87


    3/4" 0.742" 0.08 0.16 0.40 1.08 1.79 2.64
    1" .957" 0.05 0.10 0.39 0.79 1.30 1.92
    1-1/4" 1.278" 0.03 0.05 0.27 0.55 0.91 1.34
    1-1/2" 1.5" 0.02 0.04 0.22 0.45 0.74 1.09
    2" 1.939" 0.02 0.04 0.16 0.33 0.54 0.80
    2-1/2" 2.323" 0.02 0.03 0.13 0.26 0.43 0.63
    3" 2.9" 0.01 0.02 0.10 0.20 0.33 0.48
    4" 3.826" 0.01 0.02 0.07 0.14 0.23 0.34
    6" 5.761" 0.005 0.01 0.04 0.08 0.14 0.20

    Approximate Pressure Drop (PSI) per 1 Foot of line length – Tubing

    Size I.D. 2fps 4fps 10fps 15fps 20fps 25fps


    3/8" x 0.049" wall 0.277" 0.61 1.22 3.04 4.56 6.08 7.60
    1/2" x 0.065" wall 0.37" 0.31 0.63 1.57 2.35 3.13 6.19
    3/4" x 0.109" wall 0.532" 0.18 0.35 0.88 1.32 2.92 4.32
    1" x 0.120" wall 0.76" 0.08 .16 0.39 1.06 1.76 2.60
    1-1/4" x 0.120" wall 1.01" 0.04 0.09 0.37 0.74 1.23 1.82
    1-1/2" x 0.120" wall 1.26" 0.03 0.06 0.28 0.56 0.93 1.37

    Conclusion
    By using the information supplied in this tech tip and selecting the proper line sizes for your
    hydraulic equipment you will enjoy better performance and longer life from your hydraulic
    components.

    Tech Tip Archive

    3 of 3 21-Jun-18, 5:22 PM

    You might also like