MIL-DTL-27272C
TABLE V. Quality conformance inspection table.
Sampling
Title
Requirement
Inspection
tests
Periodic
Examination of product
3.3, 3.4, 3.5,
4.6.1
X
-
3.7, and 3.8
Proof pressure
3.6.4
4.6.4
-
X
Leakage pressure
3.6.5
4.6.5
-
X
Room-temperature
3.6.8
4.6.6
-
X
burst pressure
Over-tightening torque 1/
3.6.3
4.6.13
-
X
1/ Over-tightening torque test is applied to class 1 and class 2.
TABLE VI. Inspection sample. 1/
Production
Accept on zero
lot size
sample size
All
1 to 8
8
9 to 90
12
91 to 150
19
151 to 280
21
281 to 500
27
501 to 1,200
35
1,201 to 3,200
38
3,201 to 10,000
46
10,001 to 35,000
1/ A production lot shall consist of the quantity of
fittings of one size and type manufactured on
the same production line by means of the same
production techniques, materials, and controls
during the same production run.
4.3.2 Periodic tests.
4.3.2.1 Periodic tests. Periodic tests shall consist of the tests specified in table V in the order shown
except for over-tightening torque which is done individually. Proof pressure test, leakage test, and room-
temperature burst pressure test shall be performed on six fittings (three assemblies) for each size at least
once per year, regardless of the total number of fittings produced. The only exception is when there has
been no production during the past year for a particular size, then no periodic testing is needed for that
particular size. At least three of the six fittings shall be of the greatest bend angle produced during the
period. The six fittings selected shall be as representative as possible of those produced during the
period in terms of the fitting materials (example: all steel fittings, combination steel and aluminum fittings,
etc.) and joint configurations (one piece, brazed joint, welded joint, mechanical joints, etc.).
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