RR-C-901E
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified in the contract or acquisition order (see 6.2), the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or acquisition order (see 6.2), the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the government. The government reserves the right to perform any of the inspections set forth in the specification where such inspections
are deemed necessary to assure that supplies and services conform to prescribed requirements.
4.2 Quality conformance inspection.
4.2.1 Lot. A lot shall consist of not more than 200 cylinders offered for delivery at the same time.
4.2.2 Sampling.
4.2.2.1 For examination. Sampling for examination shall be in accordance with 49 CFR 178.37.
4.2.2.2 Oil content. Unless otherwise specified in the contract or acquisition order (see 6.2), the testing for hydrocarbons shall be 1 in 200 cylinders.
4.2.2.3 Impact resistance. Charpy impact samples shall be prepared from each heat of steel represented in a lot of cylinders. The sample plate shall be taken from a fabricated cylinder representative of the heat of steel and the lot of cylinders to be tested and prepared in accordance with ASTM E23. Sub-size samples are acceptable. The sample plate shall be of a length, width, and thickness to provide six Charpy impact test specimens.
4.2.3 Examination. The sample cylinders shall be examined as specified in 4.2 for the characteristics in table V.
4.3 Test methods.
4.3.1 Leakage. Cylinders with a valve threaded into the cylinder shall be charged to the indicated service pressure with oil-free air or nitrogen. The cylinder shall be immersed in water covering the valve and neck of the cylinder and observed for bubbles for two minutes. Any bubbles shall constitute failure of the test. Leakage occurring around the valve stem may be corrected and the cylinder retested.
4.3.2 Oil and hydrocarbon residue. Place a clean plug, cork, or rubber stopper in the cylinder neck, clean the area around it thoroughly with heptafluorocyclopentane (HFCPA) solvent, and wipe dry with a clean cloth. For cylinders with less than three square feet of internal surface area, remove the plug and pour in 300 milliliters (mL) of the solvent. For larger cylinders, add an additional 100 mL for each square foot of internal area over 3 square feet. Replace the plug and lay the cylinder on its side. Roll or rotate through 360 degrees on a level surface or level rolling/tumbling machine for a minimum of 10 minutes to assure all the internal surfaces have been thoroughly wetted with solvent. Remove the solvent extract into a clean beaker. Any
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