MIL-PRF-40136K
3.3.3.1 Dimensions. The assembled tank shall not be larger than 72.00-inches x 56.00-inches
x 44.00-inches (high).
3.3.3.2 Capacity. A device, such as a calibrated dipstick, shall be provided for estimating the
volume, in gallons and liters, of the fluid stored in the tank. Provisions shall be made for securing
the device on the unit when not in use.
3.3.4 Bottom loading valve assembly. The tank shall have a bottom loading, mechanically
operated internal shutoff valve to function as a fuel inlet when bottom-loading and a fuel outlet
when offloading. The valve shall automatically open when loading fuel pressure greater than 5.0
psi is applied. A separate manually operated system for controlling the bottom-loading valve shall
be installed. The loading fuel pressure range for the bottom-loading valve shall be 5.0 psi to
150.0 psi. The valve shall be fitted with a 90° elbow and a 2-inch, male, quick-disconnect
coupling conforming to A-A-59326.
3.3.5 Fuel sensor cutoff. The type I tank and pump unit shall have a level sensor and primary
pilot valve. When specified (see 6.2), a secondary pilot valve and a second level sensor shall be
provided.
3.3.5.1 Level sensor. The sensor shall operate within the tank for sensing of the fuel level. The
sensor shall detect the pressure difference between submerged and emerged conditions. The pressure
change shall activate a remote, pilot operated valve, causing flow to stop. The sensor shall have no
moving parts. The sensor shall have a "fail safe" system that will signal the main shutoff valve to close
when the nozzle flow is interrupted. Operating pressure for the sensor shall be 0 to 150 psi.
3.3.5.2 Primary pilot valve. A primary pilot valve shall be provided for attachment to a
remote level sensor. When the rising fuel level reaches the sensor, the pilot valve shall actuate
and close the main valve shutting off the fuel flow.
3.3.5.3 Secondary pilot valve. Provisions shall be made for the addition of a secondary pilot
valve, for attachment to a second level sensor. When implemented, the flow shall be reduced
when the rising fuel level reaches the primary sensor. When the rising fuel level reaches the
second level sensor the secondary pilot valve shall actuate, closing the main valve for a positive
shutoff of fuel flow.
3.3.6 Tank access.
3.3.6.1 Port. The tank shall have an access port that can be removed to gauge the fuel tank
and to pump fuel from the fuel tank. The diameter of the port shall not be less than 2.25-inches.
3.3.6.2 Access hole. The tank shall have an access hole on the top of the tank conforming to
the Code of Federal Regulations (CFR) Title 49 178.346, except the access hole shall be an ellipse
not less than 11.50-inches x 16.50-inches.
3.3.6.2.1 Access hole cover. The tank shall be equipped with an access hole cover that is
provided with a fill hole, cover and tube. The entire access hole cover shall be removable for
access to the interior of the tank. Securing of the access hole cover shall be accomplished
manually by reaching through the fill tube.
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