MIL-DTL-22606D(SH)
6.3 Selection instructions. For standardization and stocking purposes, the following should be used as a guide
for the acquisition of high pressure flasks:
a. Flasks should be selected from the cubic capacities and working pressures specified in table I. When the
desired capacity falls between the standard capacities listed, the next higher capacity should be used. When the
system working pressure falls between those listed, the next higher working pressure flask should be used. Where it
is impractical to conform to the standard capacities or working pressures specified in table I, NAVSEA approval
should be obtained prior to the acquisition of any special flasks.
b. The ½-cubic foot Type SF (separator) and 1½-cubic foot Type GF flask should be acquired in the 5000 psi
Class only and should be used for all pressures up to and including 5000 psi. When a separator with a capacity
larger than ½ cubic foot is needed, consideration should be given to the 1½-cubic foot flask.
6.4 Definitions.
6.4.1 Approved heat of steel (for flask). An approved heat of steel is defined as one from which a test sample
prepared as specified in 4.1.2 and heat-treated as specified in 3.3.3 has been tested and shown to have mechanical
properties that meet the requirements specified in table II.
6.4.2 Approved heat of steel (for non-pressure boundary parts). An approved heat of steel is defined as one
from which a test sample of the greatest material thickness supplied from the heat has been heat-treated as specified
in 3.3.3 and has been tested and shown to have mechanical properties that meet the requirements specified in table
II.
6.4.3 Furnace charge. A furnace charge is defined as flasks heat-treated at the same time in a batch-type
furnace or up to a maximum elapsed time of 4 hours of production in a continuous furnace.
6.4.4 Out of roundness. The difference between the major and minor diameters, as a percentage of the flask
OD.
6.5 Subject term (key word) listing.
Compressed air
Gas storage
Helium
High-pressure gas
Impulse
Moisture separator
6.6 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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