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|  MIL-T-21578A
Blow-out plugs - Flowmeters shall be protected by
3.4.4.1.6
blow-out plugs connected so that any leakage past the blow-out plug will be
indicated at a sight flow indicator located on the front panel and in a line re-
turning by-passed fluid to the main reservoir. Blow-out plugs shall be of
the diaphragm type, utilizing steel, brass, or synthetic diaphragms. Plugs
shall be installed in an easily accessible location and shall be designed for
quick removal and installation of the blow-out diaphragms, A strainer shall
be provided in the down stream side of the blow-out plug assembly to prevent
the ruptured blow-out plug from contaminating the system.
Single tube meters - Single tube meters shall be con-
3.4.4.1.7
structed to permit cleaning without removal of the tubes and designed so that
the meters may be readily removed as a unit. The meter shall not require
recalibration after cleaning and reassembly, An opening shall be provided
at the top of the test equipment to permit access for cleaning the meter tubes.
Multiple-tube meters - Multiple-tube meters shall be
3.4.4.1.8
assembled into a single unit including all necessary interconnecting pipe and
valves.
Float guides - Floats utilized in flowmeter tubes shall be
3.4.4.1.9
guided by the side wall of the tube. Construction of float guides must be such as
to permit removal of float for cleaning, without disassembly of the meter.
Calibration ports - Calibration ports shall be provided at
3.4.4.1.10
the inlet and outlet of the flowmeter bank, The ports shall be provided with suit-
able bleeds and shall be at least 5 tube diameters distant from the inlet and out-
let of the bank, Ports shall be readily accessible.
Remote-indicating flowmeters - Remote-indicating flow-
3,4.4.1.11
meters may be used in lieu of the variable-area glass-tube type. Accuracy
percent of instantaneous reading, and pressure drop through
shall be within
the meter shall not exceed 8 psi.
Flowmeters (hydraulic and lubricating oil) - Hydraulic
3.4.4.2
and lubricating oil flowmeters shall be of the same type specified for fuel, (see
3.4.4.1), except that the scales shall of a yellow translucent material. Hydraulic
and lubricating oil flowmeters shall be calibrated in gallons per minute and
percent of instantaneous reading (see 6.3.3(k)).
shall have an accuracy of
Totalizing flowmeters - Totalizing flowmeters, where
3.4.4.3
required, shall be as specified in the detail specification.
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