MIL-DTL-22606D(SH)
3.11.1 Flasks. Unless otherwise specified (see 6.2), permanent marking for identification of flasks shall be
stamped on the cylindrical portion of the neck not closer than ½ inch to the tangent at the root of the neck. Markings
shall be made with a round bottom low stress stamp and shall not be greater than 1/16 inch deep. Stamps with
characters greater than ¼ inch in height shall not be used. Flasks with skirts shall have the specified stamping
applied to the skirt rather than the flask neck. Flask markings shall include the following information in the order
listed:
Example of stamping
a.
Manufacturer's initial or trademark and date of
CPI, 7-2011
hydrostatic test (month and year).
b.
Specification, type, class, and service.
22606D-GF-5000-A
c.
Nominal capacity and weight, diameter, and
10-1705-18-XXXX
manufacturer's serial number.
d.
Design minimum wall thickness (inch).
0.933
Minimum wall permitted by table IV using
e.
M.860
prefix "M" (inch).
f.
Actual measured wall thickness using prefix
A.902
invoked (inch).
Identification markings used by a manufacturer during fabrication may be stamped longitudinally on the
cylindrical portion of the flask prior to forging and heat treating operations. Such markings shall be made with a
round bottom, low-stress stamp and shall not be greater than 1/16 inch deep. Stamps with characters greater than ¼
inch in height shall not be used. Manufacturer applied fabrication markings do not require removal.
3.11.2 End plugs. Permanent marking for identification of plugs shall be made by stamping with round bottom,
low-stress die stamps. Markings shall be applied to any suitable surface which will be exposed after assembly of the
plug to the flask and shall contain, as a minimum, the following information:
Example of stamping
a.
Manufacturer's initial or trademark.
CPI
b.
Hydrostatic test designation (see 3.4.2). Place
H
immediately after manufacturer's initial.
c.
Plug material.
ASTM A322 Grade 4130
d.
Heat number or code for plug.
E6
e.
Part number or drawing number of plug.
2MP2945
3.11.3 Tagging. Flasks certified oxygen clean in accordance with MIL-STD-1330 shall be marked with a
certification tag as specified in MIL-STD-1330. Each flask cleaned to MIL-STD-1330 shall also bear a weather-
resistant tag reading, "This flask inerted with dry nitrogen (A-A-59155)". All other flasks shall bear a weather-
resistant tag reading, "This flask inerted with dry nitrogen (Commercial Grade)".
3.12 Workmanship. Flasks and plugs shall be free from dirt, manufacturing debris, and oils. Threads shall be
smooth, properly formed, and free from burrs and nicks. Protective coatings shall be continuous, adherent, and free
from blisters, streaks, and bare spots.
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