The employment of high temperatures and a corrosive environment when processing ethane, nafta and other petrochemical products requires the use of specialized alloy materials compatible within the stringent operating conditions of erosion, oxidation and wear. Chemical reactions occurring on the inner diameter of the tubulars create an irreparable impact on the metal surface, damaging the material and thus, decreasing the production rates of petrochemical plants. The coating of these tubes introduces a significant performance increase.
Engineered EPVD® coatings applied to the inner diameter of tubulars protect the exposed metal surfaces from high temperature and corrosion and increase the throughput of the installation, which transforms into a significant saving if applied industry-wide. The process forms high quality diffusion coatings of multiple materials and/or alloys for extreme chemical environments in upwards of 1200° C.
Surface Engineering for the Ethylene Industry
Coking is a large and growing problem in the Ethylene Industry. Coking damages tubes and reduces furnace performance.
CoatAlloy™ is an engineered coating system which provides the necessary surface characteristics to mitigate catalytic coke formation. CoatAlloy™ is:
Inert top layer
Continuous and adherent surface oxide
Able to regenerate under pyrolysis conditions
Stable at high temperatures
Impervious to carbon
CoatAlloy™ coating materials have been strategically coupled with the EPVD® process and employed by PST in its exclusive partnership with Manoir Industries for the use in Steam cracking ethylene furnaces (both gas and liquid) and Process gas heaters of the direct reduction of iron plants.
Tube inner surface coated with CoatAlloy™ utilizing the EPVD® process satisfy the demands of Ethylene service by providing a continuous, adherent inert surface that mitigates catalytic coke formation.
The CoatAlloy™ coatings resist carburization which brings about changes in creep strength, ductility and toughness. They are self healing and have sufficient hardness and toughness to resist erosion by coke particles; they also withstand the thermal shock and cycling inherent in decoking.