BB-A-106D
6.5 Maintenance of government-furnished cylinders. Purchasers should specify the extent to
which the gas supplier should process government-furnished cylinders that require maintenance.
6.5.1 Service practices. The gas supplier should furnish at no additional cost all services that are
required at each and every filling of a cylinder to comply with applicable regulations and normal
good practice. Such services would include, but not be limited to all inspection, testing,
evacuation, and handling services required for the gas supplied.
6.5.2 Service fees. A schedule of allowable fees should be specified by the purchaser for the gas
supplier's performance of services such as the replacement of valves, valve parts, cylinder caps,
periodic inspection, cleaning, painting, color-coding, marking, and handling of unserviceable
cylinders as required. The gas supplier should furnish all materials and components for these
services.
6.6 Basis of purchase. The basis of purchase should be the cubic foot. A conversion factor of
917.7 liters per kilogram (14.7 cubic feet per pound) weight of acetylene should be used. The
weight of acetylene supplied in each cylinder is the difference between the filled weight and the
tare (unfilled) weight of the cylinder. Acetylene is available in several cylinder sizes ranging
from 283 through 11,893 liters (10 through 420 ft3) rated capacity. In general, the amount of
acetylene in a filled cylinder may vary slightly (up to 3 percent) from the rated volume capacity
of the cylinder.
6.7 Color detector tubes. The color detector tubes specified in 4.3.2.2.1 are tubes containing
granules impregnated with indicating chemicals. Two color detector tubes would be used for the
specified tests, one for phosphine/arsine and one for hydrogen sulfide. A detector tube that does
not have cross-sensitivity to hydrogen sulfide must be used when detecting for phosphine/arsine.
A detector tube that does not have cross-sensitivity to arsine and phosphine must be used when
detecting hydrogen sulfide. Phosphine/arsine color detector tubes cannot differentiate between
phosphine and arsine content. The length of color change in a tube, when a measured volume of
acetylene is passed through it, is directly proportional to the concentration of the impurity. The
tubes and associated apparatus are available from several manufacturers and in several ranges.
6.8 Part or identification number (PIN). The following PIN procedure is for government
purposes and does not constitute a requirement for the contractor.
-
X
BBA106
A - Grade A - 99.6 percent acetylene
B - Grade B - 98.0 percent acetylene
Federal specification number
8
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