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Length in inches
PIPES 44I
The thread on pipes are slightly rounded at top and bottom
so the actual depth is about four-fifths of the pitch. The depth
of the thread can be calculated by the formula:
Depth of thread = —
—
n
The length of perfect thread on a pipe is calculated by
the formula:
.8 X D + 4.8
n
D = Actual outside diameter of pipe in inches.
n = Number of threads per inch.
Water pipes are made both from steel and iron. In many
cases the iron pipe is preferred because it is under certain con-
ditions less liable to corrode.
The size of steam, gas and water pipe is designated in the
trade by the nominal internal diameter.
Ordinarily the sizes will vary more or less from the standard
as given in Table No. 77.
Besides the standard sizes as given in Table No. 77, there
are also heavier pipes known in the trade as "extra strong,"
and still heavier known as "double extra strong."
These different sizes measure the same as the standard
sizes on the outside diameter but the inside diameter is smaller
in these heavier sizes.
Table No. 77 gives only the Americam system of standard
pipes. The English system is different.
TABLE No. 78.—Whitworth Pipe Thread.
(English System.)
Nominal internal diam-
eter in inches £ i f \ f i * 1
Threads per inch 28 19 19 14 14 14 14 11
Brass and Copper Tubes.
Brazed brass and copper tubes are measured by the outside
diameter and the thickness by the Brown & Sharpe gage.
Seamless brass and copper tubing is measured by the
outside diameter and the thickness is usually measured by the
Birmingham gage.
There are also seamless brass and copper tubing in the
market known as "Iron Pipe Sizes". This kind of tube is used for
plumbing and steam work.
Extra heavy iron pipe sizes of brass, bronze and copper
pipes are also furnished by the manufacturers.
The ultimate tensile strength of seamless brass tubing will
not exceed 40,000 pounds per square inch.
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