Excess fluid is pulled in, but heavier particles cannot change direction quickly enough, resulting in artificially high solids concentration. Sample Probes and Nozzles
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.
Which (e.g., cation conductivity, silica, sodium) are most critical to your operations? Share public link
: Chloride and oxygen ingress attack stainless steel components under stress.
Carryover of sodium or chloride into the steam turbine causes pitting and stress corrosion cracking. Operational Safety
For decades, this standard has been the referee in disputes between boiler manufacturers and turbine operators, providing an unbiased "truth" regarding steam conditions during acceptance testing.
Which (like sodium or cation conductivity) are most critical to your process?
To prevent turbine blade erosion and deposit buildup. 📄 Document Versions and Availability ASME PTC 19.11 - 2008 - DIN Media
This section specifies recommended techniques and instrumentation for analyzing the chemical composition of samples.
High-pressure primary isolation valves (root valves) must be installed at the sample point. These allow the sampling line to be isolated safely for maintenance. Primary Cooling
ASME PTC 19.11 serves as the cornerstone for designing and operating a reliable SWAS. It defines the specific requirements for sample extraction, transport, conditioning, and analysis to ensure the system provides representative and accurate data.
Maintaining a steady, laminar flow prevents chemical spikes caused by shedding pipe scales. 3. Material Selection
: Specifying the instrumentation and laboratory methods used to test boiler makeup, feedwater, and condensate.
If the sampling velocity is too high or too low, a disproportionate amount of liquid droplets or solid particles will enter the probe, skewing the analysis. 2. Sample Conditioning
While the full title mentions water sampling, the industry often references PTC 19.11 in the context of the Throttling Calorimeter method. Before the widespread adoption of this standard, measuring the quality of wet steam was inconsistent across facilities. ASME PTC 19.11 codified a scientific, repeatable method that allows engineers to calculate steam quality by measuring the temperature drop across a throttling orifice.