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|  MIL-M-52329C
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pumping bitumen of penetration grade 85 to 100 at a temperature of 250 to
e
300 F. Penetration grades shall be as determined by ASTM D5. Both the ,
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pump and pump jacket shall be provided with a drain cock and an air-vent
cock. The pump shall be provided with a shear pin safety device to prevent
overloading the pump. The pump shall be provided with a drive, including a
positive-engagement-type clutch, with control lever located on the operator's
platform.
3.22.6 Hot-oil-heating piping l Hot-oil-heating piping shall be standard
weight black steel pipe or seamless steel tubing, and shall extend from the
external supply connections to the heating jackets of the transfer pump,
metering pump, pugmill, bitumen piping, strainer, and spray bars. Pipe fit-
tings shall be malleable iron or cast iron for black steel pipe. Pipe
fittings for steel tubing shall be of steel.
3.22.7 ExternaL supply connectors. External supply connectors 3 inches in
size shall be provided for connecting the asphalt transfer piping and the water
pump piping to-an external source. Each connector shall consist of a faucet
and connector and dust cap conforming to MS39153.
.
3.22.8 Metering pump. A positive-displacement, variable-volume, jacketed
metering pump shall be provided to supply bitumen to the bitumen spray bars.
The pump shall have a controllable capacity range of not less than from 9 to
70 gpm in not less than 30 preselected rates with an accuracy of within plus
or minus 1 percent when pumping bitumen with a penetration grade of 85 to 100
at a temperature between 250 and 300 F. through the installed spray-bar
system. Two pumps maybe supplied to meet the volume and accuracy require-
ments. If two pumps are provided, they may be either interchangeable or both
mounted on the mixer. The arrangement shall allow both pumps to operate
simultaneously. The pump shall be provided with a positive mechanical drive
which shall be interlocked with the apron feed drive of the gradation control
unit and shall include a clutch and shearpin safety device. Suction and
discharge connections shall be flanged.
3.22.9 Bitumen sump and strainers. A jacketed bitumen sump and a strainer
shall be provided and installed in the suction line to the bitumen metering
pump. The sump and strainer shall consist of a heavy cast-iron or welded
steel jacketed sump and a strainer with stainless steel or bronze screen.
The strainer shall be constructed so that the screen maybe removed and the
sump can be drained without disconnecting the piping. The sump jacket shall
be connected to the hot-oil heating pipe system.
3,22.10 Spray chamber. An enclosed spray chamber shall be provided at the
charging end of the pugmill. The chamber shall house the bitumen spray bars
and shall be constructed of sheet steel. The chamber shall be provided with
access doors or removable panels to permit inspection, cleaning, and removal
and replacement of spray nozzles.
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