3.3.11 Observation ports and sight glasses
Observation ports and sight
glasses shall be provided in the clean oil or fuel discharge and the water drain
Sight glasses shall be in accordance with MIL-G-2860
3 3,12 Pressure gauges, gauge piping, and connections
shall be 9 centimeters (cm) (3.5 inches) in diameter and shall be in accordance
Gauge piping and connections shall be in accordance with
3 3.13 Thermometers. Thermometers shall be 7 6 cm (3 inches) in diameter,
in accordance with MIL-T-17244. Use of mercury thermometers is prohibited.
Thermometer wells and bulbs, when supplied,
3 3.13.1 Thermometer wells
shall be in accordance with Drawing 810-1385917.
Gear driven purifiers shall be
3 3.14 Oil dipstick and sight glass.
provided with an oil dipstick or sight glass to determine the lube oil level
within the drive mechanism case
3.3.15 Thread fit. Screw threads shall be in accordance with
FED-STD-H28 and FED-sTD-H28/2
3 3.16 Doweling
Each component part of an assembled unit supported
directly by a frame or bedplate shall be doweled to facilitate reassembly and
Dowels shall be unequally spaced or be of different
maintenance of alignment
diameters, to avoid incorrect assembly.
3.3.17 Machined surfaces. Bearing and seating surfaces of frames or
bedplates shall be finish machined.
Welding shall be in accordance with MIL-STD-278
welding beads, slag, and spatter shall be removed.
Non-working surfaces, normally painted, shall be finished
(a) Surface preparation prior to painting in accordance with SSPC
(b) Two coats epoxy paint formula 151 and one coat of formula 150 in
accordance with MIL-P-24441, MIL-P-24441/1, and MIL-P-24441/2
Average 3 mils dry film thickness per coat
3.3.20 Purifier pumps
Purifier pumps shall be type III, class N-4 or 0-3
The capacity of each discharge pump shall be
in accordance with MIL-P-19131
approximately 110 percent of the rated capacity of the corresponding feed pump
Pumps shall be furnished with built-in spring loaded bypass valves
gauge and thermometer shall be installed between the discharge of the feed pump
The suction lift of the pumps, referred to
and the inlet to che purifier bowl
the horizontal centerline of pump rotors, shall be 15 inches of mercury
discharge pressure of pumps shall be 25 pounds per square inch
operating under the specified conditions of service.