"corrosion of air/brackish water cooler"

Question:

"The temperature of the control room of a coal and iron ore terminal, located near the coast, is controlled by circuling air through a 316 heat exchanger, of which the secundairy circuit consisits of brackish water pumped to and from the port. The wet part of the cooler is heavily pitted and leaking after 1 year of service, mostly at welds, the dry surface shows small pits of .1 to .2 mm deep). The cooler has a built in CP with zinc anodes which look OK. For wet surface corrosion I think of (1) wrong material for brackish water, (2) stray current between electric ground and port, (3) coal particle deposits. For the dry surface pitting I think of coal or iron particle deposits. Could you please comment on possible causes?"

Answer:

You might consider chlorides in the brackish water. They are known pitting agents of the 300-series stainless steels.

 

 << return to the previous page ::

 

Contact Us

If you have questions or need our depth of experience to help with your issues...

Call us: 281-556-8774

Email us: info@hghouston.com

News

The safe operation of oil refineries in the United States is under constant r...read more
When: January 30, 2017 - February 2, 2017 Where: Galveston Island Conventi...read more

View all articles

Stay Current

Sign up for our quarterly newsletter

covering updates on corrosion