f2a39623-33e1-4451-b38d-33578b89e819 21 4 8 decimal
&[DATE] &[TIME] - &[FILENAME]
&[PAGENUM] / &[COUNT]

Calcualation for right sizing a check valve per Crane Technical Paper No. 410

Calculation assume the use of water at standard conditions

Density of water at STP

Continuity equation

Mass flow rate

Cross sectional area of a circle/pipe

With algebraic manipulation

 4 Q * π D 2 ^ * /

Given the following parameters:

Flow from randomly selected pumps

Find the "check valve" pipe diameter that meets the corresponding minimum flow velocity (velocity is greater than the minimum velocity) in "standard weight" carbon and alloy steel-stainless steel IPS pipe. Note that this is Sch 40 up to and including 10". NOTE: This is for "full" open. Data table is provided to give the engineer the option to upsize the valve per their judgment.

Example of judgment would be tilting disc example below. 8" 'same line size' piping may be acceptable

 <p>Pipe Data - Carbon and Alloy Steel-Stainless Steel </p>

Pipe Data - Carbon and Alloy Steel-Stainless Steel Appendix B-13 through 15

This uses standard weight IPS Carbon steel Outer Diameter.

D.outer .5 .75 1 1.25 1.5 2 2.5 3 4 5 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 26 1 mat in * :

This uses standard weight IPS Carbon steel Inner Diameter.

D .622 .824 1.049 1.38 1.61 2.067 2.469 3.068 4.026 5.047 6.065 7.981 10.020 12.000 13.250 15.250 17.250 19.250 21.250 23.250 25.250 27.250 29.250 31.250 33.250 35.250 26 1 mat in * :

Pipe Friction Data for Sch40 Clean Commercial Steel Pipe with Flow in Zones of Complete Turbulence Appendix A-27

Diameters will assume "standard" weight in lieu of sch. 40. This is typical in construction

f.t .026 .024 .022 .021 .020 .019 .018 .017 .016 .015 .015 .014 .013 .013 .013 .012 .012 .012 .012 .011 .011 .011 22 1 mat :

Updade to Moody to solve for f.t

 <p>User Function</p>

Vectors - Column matrix are multiplied getting their scalar product (sum of products of their elements)in this program. To get the elemental product we need to use "for" loops.

Counter by CGB, Table inspired by jMG

Answer Header D nom (in) D(in) Q1(fpm) Q2(fpm) augment : i 1 D rows range j 1 Q rows range #v i j el 4 Q j el * π D i el ( 2 ^ * / : #v i j el Vel.min ≥ #D.o j el D.outer i el : #D j el D i el : #V j el #v i j el : 3 1 line continue if 2 1 line for for Answer.collect #D.o in / #D in / #V diag ft s / / augment : M 1 1 el TABLE : u 2 Answer.collect cols range M 1 u el --- : for Table.collect D.outer in / D in / #v ft s / / augment : Header Answer.collect M Table.collect stack 7 1 line :

AWWA swing check valve (pg. A-28)

Minimum Velocity (Note that the constant 60 should be changed depending on the style of check valve)

Check Valve Minimum Velocity

Vel.min ft s / 7.6016

Minimum velocity of a parrallel flow AWWA swing check valve. Notice that physical size is not a factor

 D nom (in) D(in) Q1(fpm) Q2(fpm) 5 5.047 9.1411 0 2 2.067 0 7.6489 TABLE --- --- --- 0.5 0.622 601.8437 84.4693 0.75 0.824 342.9336 48.131 1 1.049 211.5989 29.6981 1.25 1.38 122.2662 17.1602 1.5 1.61 89.8282 12.6075 2 2.067 54.4984 7.6489 2.5 2.469 38.1964 5.3609 3 3.068 24.7374 3.4719 4 4.026 14.3654 2.0162 5 5.047 9.1411 1.283 6 6.065 6.33 0.8884 8 7.981 3.6555 0.5131 10 10.02 2.3192 0.3255 12 12 1.617 0.2269 14 13.25 1.3263 0.1861 16 15.25 1.0012 0.1405 18 17.25 0.7825 0.1098 20 19.25 0.6284 0.0882 22 21.25 0.5156 0.0724 24 23.25 0.4307 0.0605 26 25.25 0.3652 0.0513 28 27.25 0.3136 0.044 30 29.25 0.2722 0.0382 32 31.25 0.2384 0.0335 34 33.25 0.2106 0.0296 36 35.25 0.1874 0.0263 30 4 mat

Parallel tilting disk swing check valve (pg. A-28)

Minimum Velocity (Note that the constant 30 should be changed depending on the style of check valve or the angle "α"). This corresponds to 15 degrees.

Check Valve Minimum Velocity

Vel.min ft s / 3.8008

Minimum velocity of a tilting disc check valve. Notice that physical size is not a factor

 D nom (in) D(in) Q1(fpm) Q2(fpm) 6 6.065 6.33 0 2.5 2.469 0 5.3609 TABLE --- --- --- 0.5 0.622 601.8437 84.4693 0.75 0.824 342.9336 48.131 1 1.049 211.5989 29.6981 1.25 1.38 122.2662 17.1602 1.5 1.61 89.8282 12.6075 2 2.067 54.4984 7.6489 2.5 2.469 38.1964 5.3609 3 3.068 24.7374 3.4719 4 4.026 14.3654 2.0162 5 5.047 9.1411 1.283 6 6.065 6.33 0.8884 8 7.981 3.6555 0.5131 10 10.02 2.3192 0.3255 12 12 1.617 0.2269 14 13.25 1.3263 0.1861 16 15.25 1.0012 0.1405 18 17.25 0.7825 0.1098 20 19.25 0.6284 0.0882 22 21.25 0.5156 0.0724 24 23.25 0.4307 0.0605 26 25.25 0.3652 0.0513 28 27.25 0.3136 0.044 30 29.25 0.2722 0.0382 32 31.25 0.2384 0.0335 34 33.25 0.2106 0.0296 36 35.25 0.1874 0.0263 30 4 mat