MIL-PRF-27201E
3.2 Limiting values. The following applies to all specified limits in this specification: For
purposes of determining conformance with these requirements, an observed value or a calculated value
shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification
limit according to the rounding-off method of ASTM E29 Standard Practice for Using Significant Digits in
Test Data to Determine Conformance with Specifications.
3.3 Filter. A filter with no more than a 10-micrometer nominal and 40-micrometer absolute rating
shall be installed between the manufacturer's plant system and the manifold used to fill the gas or liquid
containers for delivery.
3.4 Filled containers (Type I only).
3.4.1 Pressure. The container filling pressure (see 6.2) shall not differ from that required by the
contract by more than 1.0% at 21°C (70°F) when tested as specified in 4.5.1. In no case shall the filling
pressure exceed the rated service pressure of the container.
3.4.2 Leakage. Containers shall not leak when tested according to 4.5.2.
3.4.3 Inspection and maintenance. Compressed gas cylinders shall be inspected, maintained,
and charged according to 4.5.3.
4.
VERIFICATION
4.1 Points of inspection (see 6.2). Unless otherwise specified, acceptance tests shall be
conducted at the site of filling prior to shipment or departure.
4.2 Conformance inspection. Quality conformance tests shall consist of the following:
a. Individual tests (Type I only) ................................ 4.2.1
b. Sampling tests .................................................... 4.2.2
c.
In-stream test (Type II only) ................................ 4.2.3
4.2.1 Individual tests (Type I only). Each container shall be subjected to the following tests as
described under 4.5:
a. Filling pressure .................................................... 4.5.1
b. Leakage .............................................................. 4.5.2
4.2.2 Sampling test. The number of hydrogen containers shall be selected in accordance with
Table II and subjected to the tests required by Table I except for the parahydrogen test.
4.2.3 In-stream test. Liquid hydrogen shall be tested by an in-stream analyzer as described in
4.4.1.
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
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