Reduce Water Hammering

You don't leave us much to go on.....

Are there air operated valves slamming shut?

Sounds like "slug flow" , checks specs in link below....
https://dspace.lboro.ac.uk/dspace-jspui/bitstream/2134/10481/1/Thesis-1987-Sommerville-Marrs.pdf

You might consider going with a constant heat flux control system....

http://encyclopedia.che.engin.umich.edu/Pages/Reactors/Batch/Batch.html

There's lots on Google...

https://www.google.com/search?q=valves+water+hammer&sourceid=ie7&rls=com.microsoft:en-us:IE-SearchBox&ie=&oe=&gws_rd=ssl

"Now" implies that something has changed.

Find out wat has changed and fix it.

Sounds like a valve problem if it is new.

Latex (rubber) has more or less 7 times (α) linear thermal expansion coefficient of iron. The volume thermal expansion coefficient β is 3 times α. This means change in volume ΔV = 3α V ΔT would effect volume of latex handled.

Stop what you are doing cutting off the cooling. Sooner or later, you will probably experience a near death scene or blurred vision, nope may be black.

It is the sounds of death and fatality that you are hearing.

The grim reaper is around.

It's really sounds of death and fatality but how can reduce or eliminate it.

Turn the cooling on or leave a void volume for material to expand with out stressing the tank if cooling system is defective.

Do you have a mechanical engineer on plant, or safety engineer? Then notify guy, it is his job to do appropriate actions on the issue.

If you are the person, I am referring to, review the topic in physics "Thermal Expansion" and do something about it.

You got your job on the line, nope forget your job, yours and other people's life is far more important than your career.

Water hammer relief valve.

If the temperature controller has proportional control, you could try gradually increasing the proportional band (thereby decreasing the gain). The effect of this adjustment would be to slow down the action of the control valve as the desired setpoint is approached.

As the "error" (batch temperature vs. set point) decreases, the signal that opens the control valve would also decrease in proportion to the "error". The valve would gradually close as the setpoint is approached, instead of slamming shut. The drawback is that the last few degrees of cooling could take forever for large tanks such as these. If the final temperature is critical, additional tuning parameters (i.e., derivative and/or integral control) would minimize this offset.