MIL-PRF-25508H
4.2.4.1 Sampling methods. All apparatus used shall be made of suitable materials. Each sample
taken for analysis shall be representative of the entire contents of the container being sampled. Unless
otherwise specified in the acquisition requirements (see 6.2), sampling may be accomplished by the
following methods.
a. Type I, gaseous oxygen may be sampled in accordance with ASTM F307, for Type II, liquid
oxygen may be sampled in accordance with ASTM F310. It is critical that the outlet of the sampling port
and the other equipment used in this process meet oxygen system cleanliness standards. Use an
oxygen compatible cleaning solvent in accordance with local procedures for oxygen cleanliness.
b. By connecting the shipping container being sampled directly to the analytical equipment using
suitable pressure regulation as required. It is critical that the outlet of the sampling port and the other
equipment used in this process meet oxygen system cleanliness standards. Use an oxygen compatible
cleaning solvent in accordance with local procedures for oxygen cleanliness.
4.2.5 Non-bulk Containers. Non bulk containers are defined as containers with a water capacity
of 400 liters, or less. The number of non-bulk containers Type I (gaseous) or Type II (liquid) oxygen will
be in accordance with Table II. Containers to be sampled may be selected at random.
4.2.6 Bulk Containers. Bulk containers are defined as having a water capacity in excess of 400
liters. Each bulk container filled with Type I (gaseous) and Type II (liquid) oxygen constitutes a lot and
shall be sampled.
4.2.6.1 Continuous service. (see 6.4.1) Unless otherwise specified by the procuring activity, the
following sample option for oxygen shall be used for storage and transport tanks engaged in continuous
oxygen service (see 6.2). Contractor shall sample the contents of each transport tank engaged in
continuous oxygen service at least once every seven days at uniform intervals of time. Samples shall be
taken from the filled transport tanks. Contractor shall sample the contents of each transport tank when
entering continuous service and when the transport tank has remained empty for a period greater than 24
hours. When empty, all ports and vents shall remain closed to the atmosphere. While in continuous
service, compliance with quality conformance tests specified herein shall be determined by sampling the
filling point storage tank after each addition or, in case of continuous production, at established intervals
not less frequent than once every 24 hours. When a storage tank is being filled during a change of duty
shift, sampling shall be performed after filling.
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, samples shall be analyzed according to
the procedures described below (see 6.2). Calibration gas standards may be required to calibrate (zero
and span) analytical instruments used to determine the purity and impurity contents of the oxygen. The
accuracy of the calibration gas standards is to be traceable to the National Institute of Standards and
Technology (NIST).
4.4.1 Purity. Methods shall be selected from CGA G-4.3 except for grade F. The purity of grade
F shall be determined by difference as follows:
%O2 = 100 - 10 4 ∑ l
∑l
equals the sum of the water content, total hydrocarbons, nitrous oxide, carbon dioxide,
where
carbon monoxide, and inert gases in ppm by volume.
4.4.2 Impurities. Methods for analyzing impurities shall be selected from those of CGA G-4.3.
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