RR-C-901E
undissolved liquid floating on the surface of the solvent would indicate the presence of water or glycerin. The solvent extract shall be analyzed for hydrocarbons by one of the following methods:
4.3.2.1 Evaporation method. Evaporate the extract to dryness at slightly below the boiling point and finish the drying in an oven at 221 °P (105 °C) ±1.8 °P (1 °C) for 15 minutes. Cool, weigh, and report as milligrams of extracted oil. All traces of solvent shall be removed from the
cylinder upon completion of this test. Nonconformance to the requirements paragraph 3.3.2 shall constitute failure of this test.
4.3.2.2 Infrared spectrophotometer. A sample of the solvent extract shall be analyzed against a reference standard of the base solvent with a known hydrocarbon level of 2.5 mg per 100 mL. A response in fractional range displaying a greater contamination of hydrocarbons in the solvent extract than found in the reference standard of 2.5 mg per 100 mL shall constitute failure of this test. All traces of solvent shall be removed from the cylinder upon completion of this test.
4.3.2.3 In case of dispute. In case of dispute, final determination shall be made by the evaporation method.
4.3.3 Charpy impact test. The samples selected in accordance with 4.2.2.1 shall be tested in accordance with ASTM E23. Impact energy values shall be great enough to produce cleavage of the test samples. Cleavage shall result in not less than 50 percent fibrous fracture with a transitional temperature not higher than -58 °P (-50 °C). A lateral expansion of 0.015 inch (0.381mm) measured in accordance with ASTM A370 will be an acceptable criterion instead of
a 50 percent fibrous fracture evaluation. Aluminum cylinders shall be exempt from impact testing, as the ductility of aluminum metal is nearly constant above its transitional temperature, which is far below the range of practical use for alloys allowed in DOT approved permits or in proposed DOT specifications.
4.3.4 Gunfire test. If the steel utilized is other than 4130X steel manufactured to DOT specification 3AA, two cylinders shall be charged to the rated pressure ±5 percent using a non- liquefied gas. Each cylinder shall be placed behind a suitable steel barricade. The cylinder shall be in such a position that a bullet passing through a hole in the barricade strikes the cylinder at right angles to the longitudinal centerline within 1 inch of the longitudinal centerline and near to the vertical center of the cylinder. The cylinder temperature at the time of the test shall be between 50 °P (10 °C) and 100 °P (37.8 °C). An armor-piercing projectile 0.50 caliber in size shall be fired at the cylinder. The 0.50 caliber projectile shall strike the cylinders at a velocity of
2800 ±100 feet per second. The projectile shall strike the cylinders straight on (not tumbled). A cylinder shall be considered as having failed this test if the cylinder breaks into more than two pieces, however, pieces smaller than 2 inches in diameter coming from the areas (centering on
the perforation and 4 inches in diameter) on the cylinder adjacent to the point of entry and exit of the projectile will not be counted. Cylinder designs, representative samples of which have
passed this test, shall be permanently marked to indicate this fact. The term "NONSHAT" shall be permanently marked on the shoulder of the cylinder.
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