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|  MIL-T-62032H
3.8.6.1 Pressure vessel. The filter/separator pressure vessel shall be in accordance with
MIL-F-890l and ASME Boiler and Pressure Vessel Code, section VIII. The pressure vessel shall
be designed for a working pressure equal to or greater than the maximum pressure encountered
during operation of the pumping system. The pressure vessel shall be hydrostatically tested at
1.5 times the maximum working pressure. The pressure vessel flange gasket shall be of the
O-ring type. The main vessel shall be provided with lifting devices capable of lifting the entire
filter/separator assembly.
3.8.6.2 Air eliminator. An air eliminator shall be provided to allow automatic purging of
air from the filter/separator. The air eliminator shall be vented into the bottom of the cargo tank.
A check valve shall be provided in the air eliminator line to prohibit the back flow of product
fuel. The air eliminator shall be of the manufacturer's recommended size to allow proper air
elimination, but shall be not less than 0.75 inch in diameter.
3.8.6.3 Water slug control. A water slug control shall be provided. The water slug
control shall stop the fuel flow when a predetermined water level is reached in the pressure
vessel and shall then permit fuel flow when the water level is lowered to a predetermined level.
The water slug detector shall be capable of being positively tested by exposing the detector probe
to water, without contaminating existing fuel in the tank, and without removing the detector
probe from the vehicle. The water slug detector system shall be a Parker Hannifin part
number F716 or equal.
3.8.6.4 Automatic and manual water sump drain. An automatic water sump drain shall
be furnished and shall be either an aluminum or stainless steel vessel or an integral part of the
filter/separator. The sump drain shall be provided with an automatic water discharge and a
manually operated drain. The automatic water sump drain shall discharge accumulated water
from the filter/separator. Provisions shall be made to discharge accumulated water to the ground.
The water sump shall be structurally supported to prevent vibration on any fitting.
3.8.6.5 Liquid level indicator. A transparent liquid level indicator having a travel of
approximately 2 inches and containing a 0.25 inch diameter red or black polypropylene float, and
suitable for observing the water accumulation, shall be provided and attached directly to the
vessel. The midpoint of the indicator shall be located at a level at least 1 inch below the bottom
of the filter/coalescer elements.
3.8.6.6 Differential pressure gage. The filter/separator shall be connected to a
differential pressure gage. The gage shall indicate the pressure drop across the first and second
stages of the filter/separator. The gage shall be located such that it is visible to the operator
during refueling. The gage shall range from 0 to 25 psi, with a green background below 20 psi
and a red background above 20 psi.
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