Flow Conversion Chart

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F
C
C
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LOW
ONVERSION
HART
The accompanying chart provides fast answers to many problems that
may confront the pipe fitter. Procedures for using the chart are as follows:
Note that there are three sets of figures shown in connection with the
extreme left-hand column A.
“Standard” gives the internal diameter of standard pipe
(somewhat greater than 1" for 1 in. standard pipe).
“Exact” gives the exact diameter.
“Extra Heavy” gives the internal diameter of extra heavy pipe.
EXAMPLE:
How much water is passing through a pipe with parameters:
I.D. of exactly 1 in.
Velocity of the water being 3 F.P.S.
To apply the chart to the problem locate 1 in. in column “A” using
the scale “Exact” and run a straight line from the point through the 3
in column “C”. From the intersection of this line with column “B”.
run a straight line horizontally to column “G”. The intersection of
this line at columns “D”, “E” and “F” gives the following information:
“D” shows the cubic feet/minute flowing through the pipe.
“E” shows the volume of flow in gallons/minute
“F” gives the weight of the water in pounds/minute.
(For liquids other tharn water. multiply the value of column “F”
by the specific gravity of the liquid for accurate weight
conversion.)
If a quantity in columns “D”, “E” and “F” is known then velocity may
be determined by reversing the procedure. Draw a horizontal line
from the known point to column “G”. From this intersection draw a
line to the exact I.D. of the pipe in column “A” and extend this line to
cross column “C”. The intersection with column “C” gives the
velocity in feet/second.
The chart can be used as a.conversion chart to determine the
number of gallons in a certain number of cubic feet of liquid. The
horizontal line already drawn to determine answers in columns “C”
and “D” will provide the answer to the conversion in column “E”.
A little practice will prove this chart to be a real time-saver.
– 154 –

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