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442 BRASS AND COPPER TUBES
The ultimate tensile strength of seamless copper tubes will
not exceed 30,000 pounds per square inch.
The safe pressure allowable may be calculated by the
formula:
p= s Xt
r Xf
P = Safe pressure in pounds per square inch.
s = Ultimate tensile strength of the material in pounds
per square inch.
/ =Thickness of pipe in inches.
r = Radius of pipe in inches. / = Factor of safety.
Example.
Find the safe pressure for a brass tube 3 inches diameter
and three -sixteenths inch thick if the ultimate tensile strength
of the material is known to be 30,000 pounds per square inch, and
8 is the factor of safety.
Solution:
p = 30000 X 0.1875 = 468 pounds per square inch.
NOTE—When ordering brass or copper tubes it is always
best to specify if the measurement given is external or internal
diameter ; if the gage is Brown & Sharpe or Birmingham, and
if brazed or seamless tube is wanted. It is also advisable to
state the use of the tube as it may be had in different grades of
hardness.
TABLE No. 79.—Standard Sizes of Boiler Tubes.
Made from Steel or Charcoal Iron.
u u
V
M M J4 ^
O V) W
a a
Ho
a •3 «
2* rt b
Qco
So <« b .«J B 2u cd B
in B a «
13
-2 2
co b S3 B*
3S
CO B 1.5
la
CO fl
1 •095 2i • 095 3* .120 6 • 155
ii .095 2i .109 34 .120 7 .165
ii • 095 21 .109 4 •134 8 .165
if •095 3 .109 44 •134 9 .180
2 .095 3± .120 5 .148 10 .203
Cold Drawn Steel Tubing.
Cold drawn steel tubing (bicycle tubing) is measured by
the outside diameter, and the thickness is usually measured by
the Birmingham gage.
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