BB-A-106D
4.3.2 Tests.
4.3.2.1 Acetylene purity. (This test is required only for verification of the production facility as
outlined in 4.1.1.) Compliance with the acetylene purity requirement of 3.1 shall be determined
by gas chromatography or other appropriate instrumental method. Prior to the test, a few cubic
feet of gas shall be discharged to purge the sampling lines. The minimum acetylene content shall
be 99.6 percent (v/v) for grade A and 98.0 percent (v/v) for grade B. Otherwise, compliance
with the minimum requirements has not been met and shall constitute failure of this test.
4.3.2.2 Phosphine/arsine and hydrogen sulfide (carbide process acetylene only). Compliance of
carbide process acetylene with the phosphine/arsine and hydrogen sulfide requirements of 3.1
shall be determined qualitatively as specified in 4.3.2.2.1. In case of dispute, the acetylene shall
be quantitatively analyzed as specified in 4.3.2.2.2. Prior to each test, a few cubic feet of gas
shall be discharged to purge the sampling lines.
4.3.2.2.1 Qualitative determination. The qualitative determination for both grade A and grade B
acetylene may be made with color detector tubes for phosphine/arsine and for hydrogen sulfide
(see 6.7). If the indicated percentage of phosphine/arsine or of hydrogen sulfide is greater than
that specified in 3.1, the acetylene shall have failed the test.
4.3.2.2.2 Quantitative analysis. The quantitative determination of phosphine/arsine and of
hydrogen sulfide shall be by gas chromatography or other appropriate instrumental method. The
maximum allowance for phosphine/arsine is 0.0025 percent (v/v) for grade A and 0.05 percent
(v/v) for grade B. The maximum allowance for hydrogen sulfide is 0.0025 percent (v/v) for
grade A and 0.05 percent (v/v) for grade B. Quantities in excess of these respective amounts
shall constitute failure of this test. Analysis by gas chromatography may be performed in lieu of
the method specified in 4.3.2.2.1, if gas chromatography is the supplier's preferred method of
testing.
4.3.2.3 Leakage. After filling, each cylinder shall be tested for leakage by applying a soap
solution to all portions of the valve, the junction of the valve and cylinder, and the safety device
on the cylinder. Care shall be taken to ensure that the solution does not contaminate the valve
outlet. Any evidence of gas leakage as indicated by bubbling of the soap solution shall constitute
failure of this test.
4.4 Inspection of preparation for delivery. All cylinders shall be examined to determine if any
markings are missing, illegible, incorrect, or incomplete. Any one defect shall be cause for
rejection.
5. PACKAGING
5.1 Packing. Shipment of the cylinders of acetylene shall conform to 49 CFR 171-185.
5.1.1 Palletization. When specified (see 6.2), the cylinders of a single grade of acetylene shall
be palletized together in the vertical, valve-up position, on hardwood pallets in accordance with
the requirements of the procuring agency or activity.
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