MIL-PRF-27415C
TABLE II. Sampling for test.
Number of containers in lot
Number of containers to be sampled
1
1
2 40
2
41 70
3
71 over
4
4.2.3 Lot definitions.
4.2.3.1 Type I. A lot is defined as all of the argon supplied in one or more container(s) filled from
a single manifold at the same time.
4.2.3.2 Type II. Each filled container shall constitute a lot.
4.2.3.3 Container Assemblies. A shipping conveyance consisting of multiple cylinders or tubes
that are interconnected by a single manifold that equalizes the pressure across all cylinders/tubes to form
a single unit is considered a single container.
4.2.4 Sample. Each sample shall be of sufficient size to conduct all the quality conformance
tests as specified herein. Unless otherwise specified, the quality conformance tests shall be performed
on each required sample (see 6.2). When required, an equivalent sample shall be forwarded to a
laboratory designated by the procuring activity for subjection to the quality conformance tests specified
herein.
4.2.4.1 Sampling methods. Each sample taken for analysis shall be representative of the entire
contents of the container being sampled. All equipment used shall be made of suitable materials. Unless
otherwise specified in the acquisition requirements (see 6.2), sampling shall be accomplished by one of
the following methods.
a. Type I, gaseous argon may be sampled in accordance with ASTM F307 and Type II, liquid
argon may be sampled in accordance with ASTM F310. It is critical that the sampling port be clean and
free of contaminants.
b. Connect the shipping container being sampled directly to the analytical equipment using
suitable pressure regulation as required to prevent over-pressurization of the equipment.
4.2.5 Non-Bulk Containers. The number of containers filled with Type I (gaseous) argon
selected for sampling from each lot shall be in accordance with Table II. The first and last containers to
be filled within a given lot are typically sampled. Other samples may be selected at random. Every
container filled with Type II (liquid) argon shall constitute a lot and will be sampled.
4.2.6 Bulk transports. For bulk shipments, each container filled with Type I (gaseous) or Type II
(liquid) argon constitute a lot and shall be sampled.
4.3 Rejection. When any sample tested in accordance with 4.4 fails to conform to the
requirements specified herein, the entire lot represented by the sample shall be rejected.
4.4 Analytical procedures. Unless otherwise specified (see 6.2), samples shall be analyzed
according to the procedures described in 4.4.2. Calibration gas standards may be required to calibrate
(zero and span) analytical instruments used to determine the purity and impurity contents of the argon.
The accuracy of the calibration gas standards is to be traceable to the National Institute of Standards and
Technology (NIST).
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