Safe, Simple, Environmentally Friendly
THE PIGGING PROCESS
The DDT pigging process is the safest and most expeditious way to clean fired heater tubes. DDT is the innovator of the fired heater cleaning concept utilizing a revolutionary polymer Pigg ®. The DDT process employs a closed loop, self contained hydraulic system, making it a very safe and environmentally friendly way to clean heater tubes. DDT is the holder of many patents world wide and has also licenced the use of the technology to third parties. It is the only technology that will remove every kind of deposit in all types of fired heaters. Because the DDT process uses no chemicals and works at ambient temperatures, it can be used to clean a multiplicity of process lines, such as convection section, external crossover lines, coke transfer lines, and other sections that cannot be Steam-Air decoked.
BIDIRECTIONAL SCRUBBING ACTION
The DDT process is bidirectional, allowing the cleaning Pigg ® to traverse the heater tubes in both directions. It is the only process that can direct the Pigg ® to travel over the most contaminated section "ONLY", in a repeated back and forward motion. This repeated scrubbing action in the most fouled section expedites the cleaning process and reduces contact in areas of non contamination. Consequently, pipes which are free of coke deposits are not unduly abraded or scratched, as happens with other pig cleaning methods.
MINIMAL CUSTOMER INVOLVEMENT
The customer is only responsible to supply access to the inlet and outlet tubes of the heater to be cleaned, fresh water supply and effluent recovery. Depending on the furnace design, crossover lines may in have to be installed in special cases. The DDT supervisor will coordinate all operations with the refinery personnel to assure the furnace has been properly prepared and that all safety and refinery procedures are being followed.
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