Tetra Engineering
"Data to Decisions"

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Last Updated:
18-jan-06 11:17 CET

Scope of Service
Tetra provides engineers to review the steam cycle water treatment program on site. The engineer gathers information, performs a walk-down of water treatment equipment and interviews plant personnel. The collected information is subsequently analyzed. The analysis encompasses the following elements:

1. Specification Review: The current boiler and Steam Turbine water/steam specifications and limits is reviewed as well as the water treatment programs employed. The plant practices are compared with OEM recommendations, warrantee requirements, industry norms, and Tetra experience. Any areas of concern are identified.
2. Availability/Reliability: The actual water treatment performance, quantified from PI data or lab sample data, is compared with specification limits and water treatment vendor contractual requirements. Key areas for improvement are identified.
3. Determination of Water/Steam Quality: An assessment is made as to how well plant personnel can ascertain that key water treatment parameters are within the desired limits given the existing equipment and procedures. Sampling points, sampling frequency, equipment type and calibration are reviewed.
4. Makeup Water Systems: The makeup water treatment methods, quality, and usage is reviewed. The review includes operational feed requirements, shutdown requirements, and equipment operation/reliability.
5. Plant Degradation: A review of any known water treatment or corrosion related failures is performed. Critical water treatment factors that would eliminate or mitigate future failures are identified.
6. Layup Procedures and Requirements. Plant layup procedures and decision processes are reviewed. Included in the review is both wet and dry layup programs, sampling frequencies, oxygen control, nitrogen capping, recirculation. Key areas for improvement are identified as well as any recommended capital equipment improvements.
7. Operating Staff: The roll of the operators, engineering support functions, maintenance staff with regard to the water treatment programs is reviewed. The review includes training, coverage, sampling frequency, and operator response to out-of-specification conditions.

Deliverable
The deliverable for this service is a comprehensive report on the state of the water treatment program at the plant in question. The report includes clear recommendations on how equipment reliability might be improved by changing certain water treatment practices or procedures.