Local Exhaust Ventilation

[saumian]

We transfer a ammonia solution from Bulk-Trailer to a 6000 gal bulk-storage tank which is located inside our facility. This solution has 25% ammoniam hydroxide, 25% ammoniam chloride, and the rest is water and some other minor components. The transfer rate is 70 gal/min. What is the proper way to get rid of ammonia vapors coming into the facility?

 

[PeterAB]

Saumian

Consider routing the tank vent to a spray scrubber to clean the air that is displaced by the incoming liquid. Ammonia vapours are effectively scrubbed with a dilute acid solution (e.g. sulfuric acid).

PeterAB.

 

[Profaic]

I assume the ammonia leaves your bulk storage tank via the "breather" as displaced air.

A very simple "bubble" chamber attached to the breather (together with a vacuum relief valve) containing dilute sulphuric acid will do the trick.

Be careful of the depth of immersion of the chamber inlet. If the tank is rated to say 4 inch WG, then don't submerge the inlet pipe further than say 3 inches.

Profaic

 

[bobhearn11]

Route the displaced vapors back to the bulk truck.

 

[Assumptions]

Great way to do this.
The carrier then does the same at the other end and the result is reduced emmisions and reduced losses.

 

[chicopee]

bobhearn11 solution is best. This practice is done at many facilities where fugitive emission is to be controlled during transfer.

 

[EngineeringManger]

Is your ammonia odor problem caused whilst the disconnecting the transfer hose ?

If this is the case - use ECOSORB Odor Neutralizer (713 910 3773) which neutralizes Ammonia odors on contact, without the use of hazardous chemicals (sulphuric acid, etc.). It is a safe, cost effective solution which is only used when the spill odor occurs.

Allen Botha