Caustic Soda Storage Tank Material

Caustic soda sodium hydroxide or naoh is most commonly manufactured by the electrolysis of a sodium chloride nacl solution.

Caustic soda storage tank material.

Fiberglass tanks and the storage of caustic soda november 19 2013 in blog liquid caustic soda is corrosive. Schedule 80 pvc or cpvc fittings epdm gaskets and stainless steel bolts are recommended sodium hydroxide storage tank component materials. The product is shipped in tank trucks railcars barges and ships. Currently caustic soda is stored in fiberglass stainless steel carbon steel low carbon steel lined steel and plastic materials.

Also known as caustic soda or liquid lye sodium hydroxide is used to adjust ph in water and wastewater treatment and in the manufacture of chemicals rayon cellophane pulp and paper aluminum detergents soaps and a wide range of other products. This will contain iron sodium carbonate and when mercury rayon grade is stored mercury. Test the atmosphere in the tank for oxygen and mercury vapour before entering. Oxychem does not use mercury based electrolytic cells to produce caustic soda.

The major difference in the two grades is the amount of starting material sodium chloride remain ing in the final product. Oxychem manufactures caustic soda using either membrane or diaphragm electrolytic cells. What i am asking is whether caustic embrittlement and stress corrosion cracking will be a issue with the caustic at this temperature and concentration. Tanks of mild steel with internal external epoxy coatings have been used in cases where iron pick up is unacceptable.

Stainless steel and other alloys can also be used. Since impurities especially sodium carbonate tend to concentrate at the top or bottom of the container dipping caustic from the surface will not provide a representative sample. The weight of 50 caustic soda solution is 1 5 times that of an equal volume of water. Home chemical storage sodium hydroxide defying a chemical that finds leaks.

Sodium hydroxide polypropylene tanks. To be representative the sample must include material from every level of the tank car or tank truck. Recommendations are for storing caustic solutions in polyethylene storage tanks rated to 1 9 specific gravity and solution temperatures retained beneath 100 f. Caustic soda solution is highly corrosive and can be hazardous to personnel.

Caustic soda sodium hydroxide solution 5 51 following prolonged storage in metal tanks a black sludge will collect at the bottom of the tank. The caustic naoh solution will be stored in the tanks at 70 c and at 300 g l which are made out of mild steel as149.