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Coatings are applied to rotating equipment to address corrosion, erosion or fouling problems which increase the operating and maintenance costs of a unit and decrease reliability.
Metallic-Ceramic corrosion protective coatings and Polymeric anti-foulant coating applications have been handled previously by D-R vendors. The problems encountered with vendors understanding of the unique engineering designs of Dresser-Rand equipment has driven Dresser-Rand in the development of these specific coatings.
The installation of the coating facility in Tulsa provides our equipment owners Engineered Equipment Coatings (EEC) to complement the original design of the unit.
Dresser-Rand's EEC product line can be applied to both centrifugal compressors and steam turbine units. Engineered Coatings applicable for rotating elements and stationary components are available. Initially, three (3) basic coating systems were developed to enhance equipment corrosion or fouling protection. These systems consist of two or more sacrificial layers which work in combination to protect rotor components. Various top coat layers are applied to modify the existing surface finish to assist in reducing unit fouling or chemical resistance. Dresser-Rand's current coating systems are as follows:
- EEC-A2: Engineered Anti-foulant Coating for Turbomachinery
- EEC-A3: Engineered Equipment Coatings for Turbomachinery
- EEC-C1: Engineered Coating for Turbomachinery
- EEC-C1, S3: Engineered Coatings for Steam Turbines and Compressors
- EEC-S3: Engineered Coatings for Airfoils
- EEC-SH: Stationary Turbomachinery Component Coating
- EEC-TC: Engineered HVOF Coatings
D-R's coatings have been developed and tested to survive standard D-R shop and field component installation procedures. The D-R EEC, temperature tolerant coatings retain their bond strength and surface smoothness during typical destacking and stacking of rotor components.
Rotating Equipment
Dresser-Rand's EEC are designed to provide component protection from typical centrifugal compressor and steam turbine operating conditions. Their multi-layered systems are designed with a metallic filled base coat to provide galvanic sacrificial protection and inert top and sealer coats to provide additional barriers to product corrosive attack.
The anti-foulant coating begins with the same base but is topped off with a polymeric filled coat to increase the lubricity of the operating surfaces.
Stationary Component Coating
Coating of stationary flow path parts can provide increased efficiency if the surface finish is significantly reduced. A factory original surface finish of Ra 64 is typical, but will degrade over time in operation. Coating with EEC-C1 (corrosion protection) or EEC-A2 (fouling protection) will help restore the surface to its original smoothness or better. Dresser-Rand is offering a "SH" top coat which can reduce the final surface to a Ra 15 or better.
The Dresser-Rand Advantage
We know the operating requirements of the rotating equipment we design and can apply our Original Equipment Manufacturing expertise to the application of our EEC for your equipment solutions.