BB-H-1168D
3.5 Helium (grade B). Grade B helium shall exhibit non-flammability and buoyancy, when
tested as specified in 4.5.4.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order,
the contractor is responsible for the performance of all inspection requirements as specified
herein. Except as otherwise specified in the contract or order, 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 Points of inspection. When helium containers are filled from production plant systems or
other storage facilities for delivery to destination by any mode of transportation, quality
conformance inspection shall be conducted on the containers and their contents prior to leaving
the site of filling or shipment.
4.3 Examination of preparation for delivery. The packing and marking of the cylinders shall be
examined to determine compliance with the requirements of section 5.
4.3.1 Individual tests. Each container shall be tested for filling pressure and leakage as specified
in 4.5.1 and 4.5.2.
4.3.2 Sampling tests. When applicable, helium shall be sampled and tested, as specified in 4.5.3
or 4.5.4.
4.3.2.1 Lots. When helium cylinders are filled, each group of cylinders charged on the same
manifold at the same time shall constitute a lot. When helium tanks, as part of a tank car or tube
trailer, are filled, each tank shall constitute a lot, unless all tanks are part of a common manifold.
4.3.2.2 Sampling plan. The sample unit for testing shall be one filled sample container,
containing at least one cubic foot of gas. The sample size for each cylinder lot shall conform to
table I. In addition, with the exception of its initial service, each tank of each tank car or tube
trailer shall be sampled prior to filling and after approximately one cubic foot of gas has been
purged. It may be necessary to add gas to the tank in order to perform this test. When the tanks
of a tank car or tube trailer are part of a common manifold, one sample will be sufficient. The
lot shall be rejected if a sample fails to pass any test.
TABLE I. Sampling size for cylinder lots.
Lot size
Sample size
1 to 10 cylinders
1
11 to 40 cylinders
2
41 to 70 cylinders
3
71 or more cylinders
4
4
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