To prevent turbine blade erosion and deposit buildup. 📄 Document Versions and Availability ASME PTC 19.11 - 2008 - DIN Media
Isokinetic sampling occurs when the velocity of the fluid entering the sample nozzle matches the velocity of the main fluid stream.
High-temperature, high-pressure steam cannot be piped directly into online sensors. ASME PTC 19.11 outlines a rigorous conditioning sequence: Reduces sample temperature below 38∘C38 raised to the composed with power C 100∘F100 raised to the composed with power F ) using a sample cooler.
ASME PTC 19.11, "Steam and Water Sampling, Conditioning, and Analysis in the Power Cycle," mandates methods and hardware for obtaining representative samples of steam and water to prevent corrosion, deposition, and turbine damage in power plants. The standard details requirements for isokinetic sampling nozzles, sample conditioning for pressure and temperature, and online monitoring of chemical parameters like cation conductivity and pH to ensure high-purity water. You can find more information about ASME codes on the American Society of Mechanical Engineers website.
: Monitors air ingress into the condenser or feedwater cycle to prevent pitting corrosion. Asme Ptc 19.11 Pdf
The industry standard governing the design and operation of sampling systems is . This comprehensive guide explores the code requirements, system design principles, and how to safely implement these practices in your facility. What is ASME PTC 19.11?
Before analysis, the sample must be conditioned to safe and stable parameters. This section details the critical components of a conditioning panel: sample coolers, pressure reducers, flow meters, filters, and temperature gauges. The standard includes specific performance requirements. For instance, the conditioning system should deliver samples to analyzers at a pressure of about 2 kg/cm² and a temperature of 25°C (or a preset temperature with a tolerance of ±1°C). The design of the sample coolers—which handle high-pressure and high-temperature steam and water—must meet the standard's safety requirements.
The code provides equations to correct impurity readings for background conductivity and temperature effects.
The standard specifies maximum allowable delay times between extraction and analysis to prevent degradation of dissolved gases or pH shifts. For dissolved oxygen, the delay is measured in seconds. To prevent turbine blade erosion and deposit buildup
Prevent turbine blade tracking, boiler tube failures, and piping corrosion.
ASME PTC 19.11 is a specialized standard published by the American Society of Mechanical Engineers (ASME). It belongs to the "Performance Test Codes" (PTC) instruments and apparatus series. Scope and Purpose
To prevent these issues, a is used to monitor critical parameters like pH, conductivity, silica, sodium, dissolved oxygen, and chlorides.
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: Ensuring sample streams accurately reflect bulk fluid chemistry.
The PDF document is designed to work in tandem with other critical power industry guidelines, such as the International Association for the Properties of Water and Steam (IAPWS) documents and EPRI (Electric Power Research Institute) water chemistry guidelines. Summary of Key Takeaways
In ultra-pure water or high-temperature steam applications, specialized alloys like Inconel or Monel are utilized to prevent leaching of metals into the sample.