NOMENCLATURE
20
TRAILER DISCHARGE AIR SYSTEM AERATION: Aeration can come in several forms but they all are designed to introduce air into the load
of the hopper above the outlet. These cones can also be mounted in a plate or plenum arrangement adjacent the outlet. Another aeration design is fabric installed in the bottom of the hopper that allows air to pass through it to aerate the product. This design can also
AERATION VALVE:
used to supply air to the individual hopper. In some applications there may be only one aeration valve that supplies air to manifold feeding all the hoppers. AIR SUPPLY: The air supply line originates at the front of the trailer and transports “hot air” from the blower to the trailer. It is then diverted on demand to the aeration line and the discharge line. The air supply is coupled by a hose to the tractor, lead trailer, or stationary blower and transports all the air required to operate the trailer(s). This air supply line will have a one-way check valve at the front of the trailer to protect against air reversing back towards the blower. Pull trailers will have an air supply line under the drawbar that supplies air to the pull trailer.
Do not allow the tank or line pressure to exceed the air supply line pressure causing the product to potentially reverse toward the blower.
NOTICE
BLOW DOWN: The blow down line is plumbed into the air space at the top of the trailer and run down to the ground level where excess tank pressure can be exhausted. At the bottom of the unloading. This line can exhaust product dust and operators and personnel should stand clear of the exhaust outlet. The blow down piping assembly will also typically include a pressure relief device set to protect the tank from being over pressured.
Do not transport product under pressure.
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