Steam and Water Sampling, Conditioning, and Analysis in the Power Cycle
ASME PTC 19.11-2008 (R2018) provides essential guidelines for sampling, conditioning, and analyzing steam and water in power cycles to ensure accurate chemical analysis and prevent boiler/turbine damage. It covers the full sampling process, including requirements for isokinetic sample probes, cooling systems, and analysis methods for parameters like pH and conductivity. You can purchase the official document on the ASME website.
The specific updates introduced in the of the standard Share public link
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To prevent these issues, a is used to monitor critical parameters like pH, conductivity, silica, sodium, dissolved oxygen, and chlorides.
Ensures constant flow for online instruments using back-pressure regulators. 3. Critical Sample Points
). Temperature control is vital because pH and conductivity measurements are highly temperature-dependent. Steam and Water Sampling, Conditioning, and Analysis in
Raw samples are often too hot or under too much pressure for direct analysis. The code outlines a specific conditioning methodology :
Ensures the water chemistry remains in the tight alkaline range required to protect passivated metals. Key Technical Specifications Summary Feature / Paramater ASME PTC 19.11 Standard Requirement Sampling Type Isokinetic for steam and two-phase fluids Tubing Material 316 SS, 317 SS, or seamless Inconel Line Velocity 1.5 m/s to 1.8 m/s (5 to 6 ft/s) to maintain suspension Pressure Drop Device Variable rod-in-tube or capillary flow control Final Reference Temp 25°C (77°F) precisely controlled Isolation Valves High-pressure blowdown and root valves Finding and Using the ASME PTC 19.11 PDF Document
: Lowers the sample temperature from system conditions (often The specific updates introduced in the of the
Searching for an usually means engineers, plant operators, and quality managers are looking to design, upgrade, or audit a Steam and Water Analysis System (SWAS). What is ASME PTC 19.11?
Intermittent sampling allows particulates to settle in the lines, causing a spike in contamination readings when the line is reopened.
If cooling water fails, sample temperatures spike instantly. Mechanical thermal shut-off valves automatically close the sample line if temperatures exceed 49°C (120°F), protecting personnel and expensive sensors.
The piping from the sample point to the analyzer must be designed to minimize travel time and prevent corrosion or contamination of the sample. The document dictates materials and design velocities. D. Analysis Methods
