BB-A-106D
5.2 Marking. The cylinders shall be marked in accordance with 49 CFR 171-185. Each
cylinder shall be stenciled or tagged grade A or grade B as applicable.
5.2.1 Civil agencies. In addition to the marking specified in 5.2, the cylinders shall be marked
in accordance with FED-STD-123.
5.2.2 Military agencies. In addition to the markings specified in 5.2, the cylinders shall be
marked in accordance with MIL-STD-129.
6. NOTES
INFORMATION FOR GUIDANCE ONLY. (This section contains information of a general or
explanatory nature that is helpful, but is not mandatory.)
6.1 Intended use. The grade A acetylene covered by this specification is used as an illumination
gas for navigational lights. The grade B acetylene covered by this specification is for use in
cutting and welding.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Grade of acetylene required (see 1.2).
c.
When supplier is to furnish cylinders (see 3.2).
d.
When acetylene is to be contained in supplier-owned cylinders (see 3.2).
e.
When government-furnished replacement valves are to be utilized (see 3.3.2).
f.
AQL (see 4.2.2.2).
g.
When cylinders are to be palletized (see 5.1.1).
h.
Packaging requirements (see 5.1 through 5.2.2).
6.3 Processes. Acetylene is commercially produced by either of two types of processes:
a. Carbide process. Acetylene is produced by reaction of calcium carbide and water.
The calcium carbide has varying amounts of phosphorus and sulfur contaminants, which result in
phosphine, arsine, and hydrogen sulfide impurities in product acetylene.
b. Petrochemical processes. Acetylene is produced by the thermal or arc cracking of
hydrocarbons, such as the Wulff process or the BASF process; or by the partial combustion of
methane with oxygen, such as the Montecatini process. Acetylene so produced is sometimes
referred to as petrochemical or by-product acetylene. There is no phosphine, arsine, or hydrogen
sulfide contamination in acetylene produced by petrochemical processes.
6.3.1 Grades. Acetylene produced by either type of process is considered to meet commercial
cutting and welding requirements, which is the intended use of grade B, 98 percent (v/v)
acetylene. Further purification produces grade A, 99.6 percent (v/v) acetylene, which is often
described as purified grade. Generally, only carbide process acetylene is further purified.
6.4 Government-furnished cylinders. The contracting officer should arrange to furnish the
cylinders specified in 3.2.
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