Determining the extent of coil damage
The process of determining the extent of coil damage begins with a careful visual inspection. The entire profile is checked for signs of corrosion. Typical blue-green patina may be observed in areas directly exposed to cooling water leaks or areas exposed to air humidity. Chemically, it is composed of brochantite or antlerite. The diameter of the coil and its possible misalignment is recorded and compared with the coil drawing. The overall condition of the copper profile is assessed, including its placement in the fixing beams or epoxy reinforcement layer. The coil assessment also includes a check of the regular spacing of the expansion washers which determine the thread spacing.
The main tool for determining the extent of damage
The main tool for determining the extent of damage to the coil is the pressure test. The coil is connected to pressurized water and left at a pressure of about 8 Bar for 24 hours. The standard operating pressure of the cooling coil is around 2- 5 Bar. Exposing the coil to twice the operating pressure will expose any weaknesses in the coil and any potential leaks that would normally only become apparent after the coil has been in operation for a longer period.
The coil flow test tells us if there are hydraulic obstructions inside the profile in the form of surges or dents that cannot be detected by visual inspection. A coil profile free of hydraulic obstructions is essential, especially for emergency cooling. When the flow rate only guarantees that the coil will not burn.
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