Shell and Tube service life

[dkemper]

I've got a pair of ONDA shell and tube heat exchangers used to chill a calcium chloride brine solution to approximately -35°C

What is the expected service life of of such a system?

Are there any steps that can be take to extend the useful life?

[TXiceman]

Provided you maintain your CaCl2 charge with the proper inhibitors, and the exchanger was designed properly, no reason not to get 20 years plus from the exchanger.

Ken

[michaelm]

B”H

What is the concentration of calcium chloride to be able to reach -35C.

[dkemper]

B”H

What is the concentration of calcium chloride to be able to reach -35C.

We target a concentration of 1.28 to 1.29.

Someone pushed the concentration to 1.34 the other day thinking more must be better and just about make the whole issue moot by freezing the entire system solid.

B”H

Provided you maintain your CaCl2 charge with the proper inhibitors, and the exchanger was designed properly, no reason not to get 20 years plus from the exchanger.

Can you suggest a proper inhibitor? I'm very sure my systems have never seen any type of care or use of any inhibitors.

[RANGER1]

Probably the correct ph as well .

[charlie n]

Try Brinehib from Ashland Chemicals. ( I don't think it's food approved)
Keep the heat exchanger full of brine. If it gets exposed to air by draining the system or similar action, the tubes won't last more than a few weeks.
Minimize turbulence if you have an open system. you don't want excess oxygen in the brine.