IJ: What type of access is needed for the various types of heater tube inspection technologies?
RR: Standard heater coil designs typically are flanged at both ends, allowing mechanical cleaning of their interior surfaces. Use of intelligent pigging to inspect this type of coil design is fairly straight forward, especially since the intelligent pig is sent through the coil directly after the mechanical decoking pigs. More complex heaters that contain Common Headers used to be a challenge to both clean and inspect; however, with Header Deliver Systems (HDS) readily available on the market today, cleaning and inspection for these types of heater coils has also become routine.