MIL-S-27661C
Specifications and stand-
3.3 Selection of specifications and standards.
ards for necessary commodities and services not specified herein shall be
selected in accordance with MIL-STD-143.
3,4 Materials. Materials shall be as specified herein, Materials not
definitely specified shall be of the corrosion-resistant type or treated to
resist corrosion due to fuels, salt spray, or atmospheric conditions likely to
be met in storage or normal service and entirely suitable for the purpose.
Materials shall be free from all defects and imperfections that might affect
the serviceability of the finished strainer.
3.5 Design and construction. The sediment strainer shall consist of a
housing assembly having both inlet and outlet piping connections, a strainer
assembly within the housing assembly and a housing head attached to the hous-
ing assembly that allows removal of the screen from the housing assembly, The
design and construction of the sediment strainer shall not pemit any fluid to
bypass the screen of the screen assembly. The design and construction of the
sediment strainer shall permit easy removal of the screen assembly from the
strainer assembly without disconnecting any piping.
The sediment strainer
shall be designed and constructed to be rigidly supported by the connecting
piping.
The strainer shall be designed for a working
3.5.1 Pressure rating.
pressure of 235 pounds per square inch.
The screen assembly shall be designed
to withstand a differential pressure of 125 pounds per square inch gage with-
out damage.
3.5.2 Reliability.
The strainer shall be designed and constructed as
specified herein and to successfully complete the tests specified in 4.4.3
with no failures preventing satisfactory performance.
3.5.3 Maintainability. The design and construction of the strainer shall
provide for or do the following.
A minimum number of parts consistent with reliability and per-
a.
formance specified herein.
b.
Wherever practicable, minimize the time and training necessary
for assembly, disassembly, location of trouble sources, and
maintenance.
Wherever practicable, allow maintenance with general-purpose
c.
tools and equipment normally available commercially. Use of
special purpose tools and equipment shall be subject to approval
by the procuring activity.
d.
Allow adjustments, servicing, and replacement of parts and com-
ponents with minimum disturbance to other equipment elements.
3.5.4 Foolproofness. Where improper installation of an item could cause
malfunctioning of that item or the system in which it is installed, an unsym-
metrical mounting means shall be provided. This mounting shall be so designed
that the item can only be installed in its proper operating position.
3.6
Performance.
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