Thermal Division Thermal Expanding Services Cornerstone’s Thermal Division technicians are certified to perform thermal expansion services. We install an expansion tank which allows thermal expansion to take place without raising the temperature inside the vessel. Request Info about Thermal Expanding Our Thermal Division services a variety of industries. Select your industry below for more information. Refining Chemical Power Terminals & Pipelines Offshore Pulp & Paper Civil Engineering Marine Aerospace & Defense Get In Touch Request Information NDT/InspectionThermal