52 UNLOADING
If the unloading bin is improperly vented, a pressure reading will show up on the gauges after the product has been discharged. Determine the cause of this problem and correct it before proceeding. The tank may be under pressure. Do not open the dome. Do not open the valves. Do not remove any couplers or hoses until the pressure has been relieved.
NOTICE
The aerators will begin to vibrate the shell as the hoppers empty out. This will help to remove any material still clinging to the shell of the tank. The line control valve will have to be closed even further during this process.
When both tank and line pressure begin to fall simultaneously, the line
may still be in the discharge line.
After the dischar valve and shut off the air source.
The manholes may be opened after all pressure gauges read zero and there is no more air coming out of the blow down valve.
The manhole cover assemblies must be kept clean in order to permit proper sealing of the gaskets. Clean the manholes every time before closing.
Manhole cover assemblies must be properly adjusted to retain pressure. Make sure all safety and lid retention devices are in proper working order.
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