In fired heater mechanical pigging, many jobs may appear similar from the outside.
A pumping unit is connected, water flow is established, piggs are launched, pressure is monitored and the cleaning process begins. Across the industry, the basic steps are familiar. But the outcome of a pigging job is often determined by details that may not be obvious at first glance.
Which pigg should be used first? How aggressive should the cleaning action be? When should the crew increase size? These decisions may seem small, but inside a fired heater coil they can have major consequences.
A fired heater rarely presents the same condition from inlet to outlet. Coke deposits can vary in hardness, thickness and location. Some sections may be heavily restricted while others may already be relatively clean. Tight bends, reverse turns and geometry changes can also affect how the pigg travels through the coil. In this environment, a fixed or one-dimensional approach can limit the crew’s ability to respond correctly.
D.D.Technology’s approach is built around adaptability. Our piggs are designed with interchangeable appendages that allow the cleaning strategy to be adjusted throughout the job. Depending on the heater condition and stage of cleaning, the crew can select different appendage types, heights and configurations to improve coke removal, navigation and control. This matters because effective pigging is not about forcing the most aggressive tool through the heater. It is about applying the right cleaning action at the right time.
The ability to adapt helps the crew remove coke faster, navigate complex heater geometries and reduce unnecessary contact in areas that do not require the same level of aggressiveness. This is especially important in heaters where hard coke may exist in localized sections while other areas are already clean enough to require a more controlled approach. Experience is equally important. Pressure charts, water return, pigg condition, sponge wear and basket debris all provide valuable information during the cleaning process. But those signs only become useful when the crew knows how to interpret them and make the next decision. At D.D.Technology, decades of fired heater pigging experience have shaped a field culture focused on observation, communication, adjustment and verification.
With technologies such as our Automated Pigging Tracking System (APTS™), D.D.Technology is adding enhanced digital visibility to a proven mechanical pigging process. Higher-resolution pressure behavior, historical run records and improved monitoring help support better decision-making, training and consistency from one job to the next. Small decisions define the job. And in fired heater mechanical pigging, those decisions can make a big difference.
For more information, visit decoking.com.
