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Ammonia Local Exhaust Design

thread1043-173851

Ammonia Local Exhaust Design

Ammonia Local Exhaust Design

(OP)
Hello -

we use a distillation process to purify liquid ammonia before it's distributed as a gas.  I need to put a local exhaust system over the whole process.  

I know all the dimensions, but I need to determine fan size.  OSHA standards state that you should stay under the TLV number & size your ventilation to meet that requirement.

How do I determine the ventilation flow rate required to maintain the ammonia concentration in my hood below the TLV standard?

Thanks

RE: Ammonia Local Exhaust Design

The hood design determines the flow rate. This along with the rest of the duct system determines the fan size. The hood has to remove all of the contaminated air and an enclosed hood around the source does this the best. The flow rate has to be larger than the rate of fume generation and also to ensure the minimum control velocity at all hood openings. Hood design is situation specific and many examples with guidelines can be found in the Industrial Ventilation Manual issued by the ACGIH. The TLV value is a standard for the dilution ventilation of the room air (the air the worker breathes).

Randy

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