53 UNLOADING
UNCLOGGING PLUGGED LINES Signs that the discharge line is plugged: 1. The unloading hose does not move. 2. Tank and line pressure increase simultaneously. 3. The pressure relief valve opens. STEPS FOR CORRECTING A PLUGGED LINE.
1. Close all product valves. 2. Close the aeration valves. 3. Open the line control valve completely. Repeat a few times to see if changes 4. If the line remains plugged, stop the air source, open the blow down line and completely depressurize the tank. Then close the blow down line. Put full air pressure on the product line and quickly open the product valve on the least full hopper. This should be done after the pressure relief valve activates. This may take many times to clear the line. FOOD GRADE TRAILERS Food Grade trailers should be properly cleaned on a regular basis after unloading. The cleaning detail will depend on the product and the tank interior complexity among other reasons. Piping connections can be provided with easily removed clamps to reduce cleaning time. Gaskets, seals, valves, and material should be food grade quality and maintained to protect the product. Hopper outlets can be provided with drop tees for more accessible cleaning. Gravity doors and dust covers can be opened or removed for proper cleaning.
removed or disconnected for cleaning purposes.
INTERIOR CLEANING Interior cleaning is the carriers’ responsibility and should satisfy not only your established in-house procedures, but also those industry, religious, governmental, and customer requirements to name a few. Know the cleaning requirements for your operation. Proper cleaning is not limited just to equipment transporting food grade products and should be an integral part of carriers’ quality program.
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