MIL-PRF-27407D
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. Type I, Grade A, helium is intended for pressurization of military rocket
engine propellant systems, space vehicles and associated ground support equipment, welding and other
shielding gas operations. Type I, Grade B, helium is intended for use (when blended with oxygen) as a
respirable breathing gas for divers during deep excursions into the oceans. Type II helium is intended for
use as a cryogenic coolant in specialized test and measurement equipment.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Type and grade required, if applicable (see 1.2). Grades only apply to Type I.
c.
Method of shipment, type and capacity of containers.
d.
When limits or tests are to be added or deleted (see 3.1.1).
e.
When filtration is required (see 3.3).
f.
When variation in points of inspection is granted (see 4.1).
g.
When conformance tests on each sample are not required (see 4.2.4).
h.
When other analytical procedures are to be used (see 4.4).
i.
Cylinder size, capacity and fill pressure (as determined by cylinder size and capacity).
6.3 Packaging requirements. Guidance for cylinders may be found in the following documents:
a. RR-C-901
Cylinders, Compressed Gas: Seamless Shatterproof, High
Pressure DOT 3AA Steel, and 3AL Aluminum
b. 49 CFR 171 199
Code of Federal Regulations
c. CGA C-6
Standards for Visual Inspection of Steel Compressed Gas
Cylinders
6.4 Subject term (key word) listing.
Aerospace
Breathing
Coolant
Cryogenic
Cylinders
Divers
Respiration
Shielding
Space vehicle
Welding
6.5 Changes from previous issue. Marginal notations are not used in this revision to identify
changes with respect to the previous issue due to the extent of the changes.
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