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    Fluid Pressure Loss Calculations: P 0.0273 Q V L D

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    sanjibkrjana
    The document provides information and formulas for calculating fluid pressure loss in pipes or tubes. It gives the formula for calculating pressure loss based on flow rate, viscosity, length, and tube diameter. It also includes tables with standard tube factors and equivalent lengths for different pipe fittings that can be added to the total length in pressure loss calculations.

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    Attribution Non-Commercial (BY-NC)
    Download as XLSX, PDF, TXT or read online from Scribd

    Fluid Pressure Loss Calculations: P 0.0273 Q V L D

    Uploaded by

    sanjibkrjana
    504 views7 pages
    The document provides information and formulas for calculating fluid pressure loss in pipes or tubes. It gives the formula for calculating pressure loss based on flow rate, viscosity, length, and tube diameter. It also includes tables with standard tube factors and equivalent lengths for different pipe fittings that can be added to the total length in pressure loss calculations.

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    Pressure Drop

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    The document provides information and formulas for calculating fluid pressure loss in pipes or tubes. It gives the formula for calculating pressure loss based on flow rate, viscosity, length, and tube diameter. It also includes tables with standard tube factors and equivalent lengths for different pipe fittings that can be added to the total length in pressure loss calculations.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
    504 views7 pages

    Fluid Pressure Loss Calculations: P 0.0273 Q V L D

    Uploaded by

    sanjibkrjana
    The document provides information and formulas for calculating fluid pressure loss in pipes or tubes. It gives the formula for calculating pressure loss based on flow rate, viscosity, length, and tube diameter. It also includes tables with standard tube factors and equivalent lengths for different pipe fittings that can be added to the total length in pressure loss calculations.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as XLSX, PDF, TXT or read online from Scribd
    Download as xlsx, pdf, or txt
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    Fluid Pressure Loss Calculations

    Midway Industrial Systems


    4759 Old Hwy 8, Mounds View, MN 55112
    Phone: 763-780-3000 Toll Free: 1-800-279-1401
    www.midwayis.com

    *calculate pressure drop in pipe or tube length by use of the following formula

    0.0273 * Q * V * L
    P=
    D4
    Where:
    P= Pressure drop in pounds per square inch(PSI) over the length of
    the tube/pipe
    Q= Flow rate in gallons per minute (GPM)
    L= Length of pipe in feet
    V= Viscosity of fluid in poise (100 centipoise = 1 poise)
    D4= Tube factor (4th power of diameter in inches)

    Input (insert values in the green boxes and the tubing


    characteristics will be calculated below)

    Value Name Unit


    Input= Total Spray Rate Gallons/Min
    Input= Viscosity Poise
    Input= Tube Run Feet
    Input= Tube Size Inches
    Input= Wall Thickness Inches
    Input= 60 Circulation Rate Feet/Min 60 = Standard

    Output

    Value Name Unit


    Output= 0 Inside Diameter Inches
    Output= 0.00 Circulation Flow Rate Gallons/Min
    Output= 0.00 Q = Total Flow Rate Gallons/Min
    Output= 0 L = Tube Run Distance Feet
    Output= 0 V = Viscosity Poise
    Output= 0 D = Inside Tube Diameter

    Pressure Loss = PSI


    calculatin
    g to take
    into
    account
    all
    pressure
    loss as
    seen by
    the
    system.
    This Standard Tube and Pipe Factors
    table is
    broken Tube or Pipe Size (inches) Factor D Factor D4
    down 1/4 I.D. Nylon Tube 0.25 0.0039
    first by 1/4 Schedule 40 Pipe 0.65 0.18
    Nominal 3/8 Schedule 40 Pipe 0.493 0.059
    tubing 1/2 Schedule 40 Pipe 0.622 0.15
    size, and
    3/4 Schedule 40 Pipe 0.824 0.46
    then
    gives the 1 Schedule 40 Pipe 1.049 1.21
    equivale 1 1/4 Schedule 40 Pipe 1.38 3.6
    nt length 1 1/2 Schedule 40 Pipe 1.61 6.65
    in feet. 2 Schedule 40 Pipe 2.07 18.3

    Equivalent Length of standard pipe in feet

    Pipe 180 Tee Tee


    Size Gate Globe 45 90 Close Thru Thru
    Inches Valve Valve Elbow Elbow Ret. Run Branch
    1/2" 0.41 18.5 0.78 1.67 3.71 0.93 3.33
    3/4" 0.54 24.5 1.03 2.21 4.9 1.23 4.41
    1" 0.69 31.2 1.31 2.81 6.25 1.56 5.62
    1 1/4 0.9 41 1.73 3.7 8.22 2.06 7.4
    1 1/2 1.05 48 2.15 4.31 9.59 2.4 8.63
    2 1.35 61.5 2.59 5.55 12.3 3.08 11.6
    Fluid Pressure Loss Calculations

    Phone: 763-780-3000 Toll Free: 1-800-279-1401


    Web: www.midwayis.com

    *calculate pressure drop in pipe or tube length by use of the following formula

    0.0273 * Q * V * L
    P=
    D4
    Where:
    P= Pressure drop in pounds per square inch(PSI) over the length
    of the tube/pipe
    Q= Flow rate in gallons per minute (GPM)
    L= Length of pipe in feet
    V= Viscosity of fluid in poise (100 centipoise = 1 poise)
    D4= Tube factor (4th power of diameter in inches)

    *Auto Calculator (insert valvues for Q,L,V, and D and the pressure drop will be
    calculated in the red box labeled P below)

    Value Name Unit


    Input= 0.375 Total Spray Rate Gallons/Min
    Input= 1.9 Viscosity Poise
    Input= 276 Tube Run Feet
    Input= 0.75 Tube Size Inches
    Input= 0.035 Wall Thickness Inches
    Input= 0 Circulation Rate Feet/Min
    0.68 Inside Thicknes Inches
    0 Circulation Flow Rate Gallons

    Q= 0.375 GPM
    L= 276 feet
    V= 1.9 poise
    D= 0.68 inches * note D not D4

    Pressure Loss = 25.11 PSI

    Standard Tube and Pipe Factors

    Tube or Pipe Size (inches) Factor D Factor D4


    1/4 I.D. Nylon Tube 0.25 0.0039
    1/4 Schedule 40 Pipe 0.65 0.18
    3/8 Schedule 40 Pipe 0.493 0.059
    1/2 Schedule 40 Pipe 0.622 0.15
    3/4 Schedule 40 Pipe 0.824 0.46
    1 Schedule 40 Pipe 1.049 1.21
    1 1/4 Schedule 40 Pipe 1.38 3.6
    1 1/2 Schedule 40 Pipe 1.61 6.65
    2 Schedule 40 Pipe 2.07 18.3
    *Below is a list of equivilent lengths (a length in feet of tubing that is equivilent to the pressure loss
    caused by a fitting, valve or elbow.) These lengths can be added to the length of the circulating
    system you are calculating to take into account all pressure loss as seen by the system. This table
    is broken down first by Nominal tubing size, and then gives the equivilent length in feet.

    Equivalent Length of standard pipe in feet

    Pipe 180 Tee Tee


    Size Gate Globe 45 90 Close Thru Thru
    Inches Valve Valve Elbow Elbow Ret. Run Branch
    1/2" 0.41 18.5 0.78 1.67 3.71 0.93 3.33
    3/4" 0.54 24.5 1.03 2.21 4.9 1.23 4.41
    1" 0.69 31.2 1.31 2.81 6.25 1.56 5.62
    1 1/4 0.9 41 1.73 3.7 8.22 2.06 7.4
    1 1/2 1.05 48 2.15 4.31 9.59 2.4 8.63
    2 1.35 61.5 2.59 5.55 12.3 3.08 11.6
    Absolute and kinematic viscosity of air at temperatures ranging -40 - 1000 oC (-40 - 1500 oF) at standard
    atmospheric pressure - Imperial and SI Units
    Imperial (BG) Units: SI Units:

    Temperature Dynamic Viscosity Kinematic Viscosity Temperature Dynamic Viscosity


    -t- -μ- -ν- -t- -μ-
    (oF) (lbf s/ft2) x 10-7 (ft2/s) x 10-4
     
    (K) (kg/m s) x 10-5
    -40 3.29 1.12 100 0.6924
    -20 3.34 1.19 150 1.0283
    0 3.38 1.26 200 1.3289
    10 3.44 1.31 250 1.488
    20 3.5 1.36 300 1.983
    30 3.58 1.42 350 2.075
    40 3.6 1.46 400 2.286
    50 3.68 1.52 450 2.484
    60 3.75 1.58 500 2.671
    70 3.82 1.64 550 2.848
    80 3.86 1.69 600 3.018
    90 3.9 1.74 650 3.177
    100 3.94 1.79 700 3.332
    120 4.02 1.89 752 3.481
    140 4.13 2.01 800 3.625
    160 4.22 2.12 850 3.765
    180 4.34 2.25 900 3.899
    200 4.49 2.4 950 4.023
    300 4.97 3.06 1000 4.152
    400 5.24 3.65 1100 4.44
    500 5.8 4.51 1200 4.69
    750 6.81 6.68 1300 4.93
    1000 7.85 9.3 1400 5.17
    1500 9.5 15.1 1500 5.4
    1600 5.63
    1 N s/m2 = 1 Pa s = 10 poise = 1,000 milliPa s
    1 m2/s = 1 x 104 cm2/s =1 x 104 stokes = 1 x 106 centistokes
    - 1500 oF) at standard

    SI Units:

    Kinematic Viscosity
    -ν-
     
    (m2/s) x 10-6
    1.923
    4.343
    7.49
    9.49
    15.68
    20.76
    25.9
    28.86
    37.9
    44.34
    51.34
    58.51
    66.25
    73.91
    82.29
    90.75
    99.3
    108.2
    117.8
    138.6
    159.1
    182.1
    205.5
    229.1
    254.5

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