Replace Leaking Coil Heaters with a Robust Heat Exchanger

How you know it’s time to consider a heat exchanger: If you own and operate a 25-year-old+ evaporator that uses integrated coil heaters for pasteurization, and these coils have ever sprung a leak.

Coil heaters were extensively used by some evaporator manufacturers for product heating. These coils are typically incorporated into cylindrical shells, sometimes superimposed on falling film calandria shells, and are almost always inaccessible for inspection and repair.

Over many years of service and rigorous thermal cycling, coils eventual crack and develop leaks, which results in milk contamination of condensate. This situation requires immediate attention, yet the unfortunate reality is that these coil designs are virtually impossible to access and repair.

A common short-term remedy is to by-pass the coil and compromise system capacity. Avoid the unexpected failure and make plans now to systematically replace your coils with a more robust shell-and-tube heat exchanger.

The Shell-and-Tube Heat Exchanger

The shell-and-tube design consists of a cylindrical shell containing a bundle of tubes that are firmly held in place by a set of rigid tube sheets and internal support baffles.

Typically, a fluid passes through the inside of the tubes while steam or water vapor under vacuum is condensed on the outer wall of the tubes thereby heating the fluid. To alleviate thermal stresses, an expansion joint is frequently included on the shell, which reduced the risk of tube damage. The rigidity and accessibility of the heat transfer tubes represents a far more durable and serviceable design than the outdated coil designs.

Is It Time to Eliminate the Problematic Coils Once and For All?

If you need help assessing the risks posed by the coil heaters in your facility, Caloris can make an inspection visit and provide an estimate to replace your coil heater(s) with a more durable heat exchanger design.

Contact Us Today!

Contact Caloris today for information on our evaporators or other processing systems and services. Call us at 410-822-6900 or send email to


About Caloris

Caloris transforms process systems design for the better with unexpected, future-focused solutions that solve real operational problems. We engineer efficient, dependable and productive solutions that also improve environmental sustainability where practical. Designed with the end user in mind to drive plant productivity. Caloris offers evaporation, membrane filtration and spray drying process systems for food and dairy industries, as well as for water reuse and wastewater treatment applications. Both Caloris’ custom and pre-engineered packaged systems are designed to meet our customers’ specific concentration/purification needs utilizing the most cost effective and energy efficient technologies available. Whether concentrating dairy, food or juice products at a high-volume production facility, or processing industrial wastewaters to reduce transportation and treatment costs and recover re-usable water, Caloris provides a range of options and technologies.