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NFPA Valves and Fittings Tables

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When using the Hazen-Williams method, the most accurate way to account for resistance due to valves and fittings is to add an equivalent length for the valve or fitting to the pipe length.  Using this method and the NFPA 15 Standard, we created valves and fittings tables for two common pipe materials, Stainless Steel Pipe (ANSI B36.19M) and Welded and Seamless Wrought Steel Pipe (ANSI B36.10M).  The standard valves and fittings table that comes with PIPE-FLO was created using the formulas found in Crane TP410.  These equations were developed using the Darcy-Weisbach method, which is why they are not as accurate when used with the Hazen-Williams method.

The executable file, located at the bottom of the page, contains the following tables:

ANSI B36.19M (Stainless), Schedules
5S
10S
40S
80S

ANSI B36.10M (Steel), Schedules
20
30
40
60
80
100
120
140
160

Each of the tables has the valves and fittings at different C values.  Make sure that the valve or fitting you add to the pipeline is for the specific C value of the pipe material.

The NFPA 15 Standard has equivalent lengths for valves and fittings based on the type of valve or fitting and the pipe size. Then, depending on the C value and the pipe inside diameter in relation to steel schedule 40 inside diameter, there are factors to multiply the equivalent length by.  Tables 1-4 show the equivalent lengths as specified by the NFPA 15 Standard for a variety of valves and fittings for Schedule 40 steel pipe with a C value of 120.

  Fittings and Valves Expressed in Equivalent Feet (Meters) of Pipe
   3/4 in.  1 in.  1 1/4 in.
 Fittings and Valves  ft  m  ft  m   ft  m
 45° Elbow  1  0.3  1  0.3  1  0.3
 90° Standard elbow  2  0.6  2  0.6  3  0.9
 90° Long turn elbow  1  0.3  2  0.6  2  0.6
 Tee or cross (flow turned 90°)  4  1.2  5  1.5  6  1.8
 Gate valve  ---  ---  ---  ---  ---  ---
 Butterfly valve  ---  ---  ---  ---  ---  ---
 Swing check  4  1.2  5  1.5  7  2.1
Table 1 - Equivalent Pipe Length Chart (3/4 in. - 1 1/4 in.)

  Fittings and Valves Expressed in Equivalent Feet (Meters) of Pipe
   1 1/2 in.  2 in.  2 1/2 in.
 Fittings and Valves  ft  m  ft  m  ft  m
 45° Elbow  2  0.6  2  0.6  3  0.9
 90° Standard elbow  4  1.2  5  1.5  6  1.8
 90° Long turn elbow  2  0.6  3  0.9  4  1.2
 Tee or cross (flow turned 90°)  8  2.4  10  3.1  12  3.7
 Gate valve  ---  ---  1  0.3  1  0.3
 Butterfly valve  ---  ---  6  1.8  7  2.1
 Swing check  9  2.7  11  3.4  14  4.3
Table 2 - Equivalent Pipe Length Chart (1 1/2 in. - 2 1/2 in.)

  Fittings and Valves Expressed in Equivalent Feet (Meters) of Pipe
   3 in. 3 1/2 in.  4 in.  5 in.
 Fittings and Valves  ft  m  ft  m  ft  m  ft  m
 45° Elbow  3  0.9  3  0.9  4  1.2  5  1.5
 90° Standard elbow  7  2.1  8  2.4  10  3.1  12  3.7
 90° Long turn elbow  5  1.5  5  1.5  6  1.8  8  2.4
 Tee or cross (flow turned 90°)  15  4.6  17  5.2  20  6.1  25  76
 Gate valve  1  0.3  1  0.3  2  0.6  2  0.6
 Butterfly valve  10  3.1  ---  ---  12  3.7  9  2.7
 Swing check  16  4.9  19  5.8  22  6.7  27  8.2
Table 3 - Equivalent Pipe Length Chart (3 in. - 5 in.)

  Fittings and Valves Expressed in Equivalent Feet (Meters) of Pipe
   6 in.  8 in.  10 in.  12 in.
 Fittings and Valves  ft  m  ft  m  ft  m  ft  m
 45° Elbow  7  2.1  9  2.7  11  3.4  13  4.0
 90° Standard elbow  14  4.3  18  5.5  22  6.7  27  8.2
 90° Long turn elbow  9  2.7  13  4.0  16  4.9  18  5.5
 Tee or cross (flow turned 90°)  30  9.2  35  10.7  50  15.3  60  18.3
 Gate valve  3  0.9  4  1.2  5  1.5  6  1.8
 Butterfly valve  10  3.1  12  3.7  19  5.8  21  6.4
 Swing check  32  9.8  45  13.7  55  16.8  65  19.8
Table 4 - Equivalent Pipe Length Chart (6 in. - 12 in.)

Table 5 shows the factors to multiply the values in Tables 1-4 by depending on the C value.

 Value of C  100  120  130  140  150
 Multiplication Factor  0.713  1.00  1.16  1.31  1.51
Table 5 - Multiplication Factors for different C values

The following equation gives the factor to multiply the values in Tables 1-4 by depending on the inside diameter:

(actual inside diameter/Schedule 40 steel pipe inside diameter)4.87 = factor

Using these values and equations, we were able to create valves and fittings tables for Stainless Steel Pipe (ANSI B36.19M) and Welded and Seamless Wrought Steel Pipe (ANSI B36.10M).

If you want to use valves and fittings in a pipe material other than the two here, you can continue to add equivalent lengths to the pipeline, or you can create a new valves and fittings table for the pipe material.  If you download the Excel document called V&F Table Template there are spaces for you to enter information about your pipe material.  On the sheet titled 'Enter Data Here' you can enter the internal diameters of your pipe and the C value.  The next sheet, named 'Enter this in Table Manager,' has a table with the values to enter in the Table Manager.

Here are the steps to create the valves and fittings table:

From the Table Manager main screen, click on Valve/Fittings Tables



In the Valve/Fitting Data dialog box, click New Table



You will be prompted to save the table.  The name you select to save the table will be the name filled into the Table Name box.  Now you will need to enter a version for the table.  You will also need to fill in the boxes for Device Type, Description, and Table formula.  For the table formula, select Formula 9 – L/D varies with pipe diameter.  Formula 9 is Le = KD/fT.



The values for L/D, Metric Max, and US Max will come from the 'Enter this in Table Manager' page from the spreadsheet.



Make sure that you put the same name in the Description box for all the different sizes of the same valve or fitting.  In the image above, the three different sizes of the 45 degree elbow have the same name, but the information for L/D, Metric Max, and US Max is different.

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Last Updated
6th of December, 2012

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Visitor Comments

  1. Comment 1 Posted by: b v rao

    good and useful forum. Can I get the values of equivalent lengths for butterfly and globe valves closed 40%, 60% & 80%?

  2. Comment 2 Posted by: ss

    good

  3. Comment 3 Posted by: hdba

    fitting loss

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