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Page Title:
Hydrostatic pressure resistance |
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|  MILT8504B
3.6 Hydrostatic pressure resistance. When subjected to an internal pressure P or
15,000 pounds per square inch (psi), whichever is less, tubing shall show no bulging,
leakage, or other defects, except that a diametric permanent set to 0.002 inch per inch
of diameter is acceptable. Hydrostatic test pressure shall be calculated according to the
following formula:
S (D2 d2)
P=
(D2 + d2)
Where:
P = test pressure in psi.
S = specified minimum tensile yield strength, psi.
D = maximum permissible outside diameter (nominal OD plus
tolerance), inch
d = maximum permissible inside diameter (computed as D less twice
the minimum permissible wall thickness), inch.
3.7 Dimensions and tolerances
3.7.1 Dimensions. Tubing shall be furnished in the standard diameters and wall
thickness specified in AND10104, as specified by the contract or purchase order. (see
6.2).
3.7.2 Tolerances. The outside diameter shall not vary from the nominal dimensions by
more than the permissible limits of table IV. Wall thickness variations shall not exceed
+10 percent of the nominal wall thickness.
TABLE IV. Outside diameter tolerance
Size range, outside diameter
Tolerance
(inch)
(inch)
to 0.187 exclusive
+0.003 0.000
0.187 to 0.500 exclusive
+0.004 0.000
0.500 to 1.500 exclusive
+0.005 0.000
1.500 to 2.500 exclusive
+0.010 0.000
2.500 to 3.000 exclusive
+0.010 0.010
Over 3.000 thru 5.000
+0.015 0.015
3.8 Weld bead. When tubing is fabricated by welding, it shall be so processed as to
remove the bead or any dimensional indication of the presence of the weld.
3.9 Straightness. In no portion of any piece of tubing shall the departure from
straightness exceed 0.060 inch in a length of 3 feet.
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