The standard provides a systematic approach to water and steam analysis, covering the entire process from the pipe to the laboratory. The key areas it addresses include:
High-pressure samples must be stepped down safely. The standard recommends using rod-in-tube capillary pressure reducers rather than standard valves. Valves can cause excessive shear stress, strip volatile chemicals, or trap particulate matter. 2. Temperature Isolation & Cooling Samples must be cooled in two stages:
Once collected, the sample must be transported to the analysis point without any degradation or contamination. This section provides guidelines for sample line construction, including material selection, and addresses potential issues like deposition of impurities within the sample lines.
ASME PTC 19.11-2008 (R2018) defines essential standards for steam and water sampling in power cycles, emphasizing representative, isokinetic sampling to protect equipment from corrosion and scaling. It provides mandatory guidelines for sample conditioning and continuous monitoring to ensure accurate chemistry data. The official document is available through the ASME Digital Collection. Asme Ptc 19.11 Pdf
Facilities build specialized to meet ASME PTC 19.11 guidelines. A compliant SWAS panel incorporates the following sequential components:
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.
Calibrate pH, sodium, and dissolved oxygen probes monthly using certified standard solutions. The standard provides a systematic approach to water
Use the correct edition (latest is ). Apply it during test planning, not after sampling goes wrong.
[ Process Pipe ] ──> [ Isolation Valve ] ──> [ Primary Cooler ] ──> [ Pressure Reducer ] │ [ Online Analyzers ] <── [ Temperature Control ] <── [ Thermal Shut-off ] <┘
Establishes procedures to minimize sampling errors that can lead to equipment damage. 🔬 Key Technical Requirements 1. Isokinetic Sampling Valves can cause excessive shear stress, strip volatile
ASME PTC 19.11 is an American National Standard developed by the American Society of Mechanical Engineers (ASME). Its full title is
Ensures constant flow for online instruments using back-pressure regulators. 3. Critical Sample Points