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MIL-S-24686A(SH)
4.4.2 Inspecti on lot.  For the purpose of quality conformance inspection and
test sampling, a lot is defined as all the sprinklers of the same material, type,
style, size, and temperature rating produced in one facility using the same
production processes and offered for delivery at the same time.  All sprinklers in
the lot must have been manufactured within the preceding 12 months.  For the
purpose of quality conformance inspection and test sampling of frangible bulbs, a
lot is defined as all bulbs of the same material, type, style, and temperature
rating produced in one facility and delivered at the same time.
4.4.3  Sampling f or Quality conformance ins pection .  As a minimum, the
contractor shall randomly select a sample quantity from each lot of completed
sprinklers in accordance with tables V and VI and inspect them in accordance with
4.4, 4.5.1 and 4.5.2.  Sample size depends on the sampling plan code letter shown
in table V.  If one or more defects are found in any sample, the entire lot shall
be rejected.  The contractor has the option of screening the lot 100 percent for
the defective characteristic(s) or providing a new lot which shall be inspected in
accordance with sampling plan contained herein.  The contractor shall maintain for
a period of 3 years after contract completion records of inspections, tests, and
any resulting rejections.
Sample size for Quality conformance insp ect ions an d tests.
TABLE VI.
Sample size
Sampling plan
Sampling plan
code letter B
code letter A
Lot size
ALL
ALL
1-8
8
ALL
9-20
8
20
21-90
12
20
91-150
19
20
151-280
47
21
281-500
27
47
501-1200
35
53
1200-OVER
4.5 Tests.
4.5.1 Leakage test.  Each sample shall be subjected to a leakage test to
determine compliance to 3.5.  The pressure shall be increased to 500 psig and held
for 1 minute.  During this test, there shall be no weeping or leakage.  Test shall
be conducted using clean fresh water.
4.5.2 Operating temperature bath test.  Each sample shall be subjected to a
test to verify the actuating temperature range to determine compliance with 3.5.
The test shall be performed in accordance with the requirements of the ANSI/UL 199
operating temperature bath test, except that the frangible bulbs (as opposed to
the assembled sprinklers) may be tested.
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