Tank Car Unloading

Caustic Soda Solution
All Dow caustic soda solution tank cars are equipped with an eduction pipe and can be unloaded through the dome connections on the top of the car using air pressure, or unloaded through the bottom outlet valve. Caustic soda solutions are normally unloaded through the bottom outlet valve using either air pressure or a centrifugal pump to transfer the solution to a storage tank.

If gravity flow to the pump inlet is used, the outlet valve in the piping from the transfer pump should be throttled to prevent cavitation on the suction side of the pump.

Unloading through the dome using air pressure is satisfactory for 50% caustic soda solution, provided the total elevation from the bottom of the tank car to the top of the storage tank piping is not more than 30 feet.

For additional information on tank car unloading, review Pamphlet 087 "Recommended Practices for Handling Sodium Hydroxide Solution and Potassium Hydroxide Solution (caustic) Tank Cars." This pamphlet and additional resource materials can be purchased through the Chlorine Institute web site or send your request via fax to (703) 741-6068.

The information contained above is supplemental to the Internet Disclaimer and is not intended to be all-inclusive as it relates to use, handling, storage, disposal and all other described activities. Recipients must make their own determination of suitability and are responsible for compliance with all applicable federal, state, provincial, municipal laws and/or other regulations. This information is offered solely for your consideration and verification and in no event will The Dow Chemical Company be responsible for damages of any nature whatsoever resulting from the use or reliance upon this information or the product to which this information pertains.