MIL-PRF-27401G
4.2.3 Lot definitions.
4.2.3.1 Type I. A lot is defined as all of the nitrogen 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 for the purpose of this specification.
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 testing.
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 nitrogen may be sampled in accordance with ASTM F 307 and Type II, liquid
nitrogen may be sampled in accordance with ASTM F 310. It is critical that the outlet of 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. Non-bulk containers are defined as containers of 400 liters or less
water capacity. The number of containers filled with Type I (gaseous) nitrogen 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)
nitrogen shall constitute a lot and will be sampled.
4.2.6 Bulk transports. Bulk containers are defined as containers of more than 400 liters water
capacity. Each bulk container filled with Type I (gaseous) or Type II (liquid) nitrogen constitute a lot and
shall be sampled.
4.2.6.1 Continuous service. Unless otherwise specified by the procuring activity, the following
sample option for nitrogen shall be used for storage and transport tanks engaged in continuous nitrogen
service (see 6.2). Contractor shall sample the contents of each transport tank engaged in continuous
nitrogen 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. (see 6.5.1)
4.2.7 Pipelines. Unless otherwise specified in the contract, the following sampling plan shall be
used for pipelines: Sampling to determine specification compliance shall be accomplished by drawing
liquid phase samples from each filled container transporting liquid for conversion to gas and by drawing
samples from the gas supplied into the user's system (see 6.2).
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