Impurities carry over from the boiler into the steam. They deposit onto turbine blades, causing aerodynamic losses, stress corrosion cracking (SCC), and pitting. Replacing a damaged turbine rotor can cost millions of dollars and cause months of downtime. 2. Boiler Tube Failures
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ASME PTC 19.11-2008 (R2018) provides essential standards for steam and water sampling, conditioning, and analysis in power cycles to ensure representative sampling. The code covers methods for monitoring feedwater and steam, including requirements for isokinetic sampling and sample conditioning to prevent contamination. Purchase the official document at ASME Standards Store .
Isokinetic sampling means the velocity of the fluid entering the sampling nozzle matches the velocity of the fluid flowing in the main process pipe. Asme Ptc 19.11 Pdf
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One of the most essential and technically rigorous features of ASME PTC 19.11 is the requirement for .
The document is protected by copyright laws. You can safely purchase and download the legitimate, updated PDF version from: The Official ASME Digital Collection Store. Impurities carry over from the boiler into the steam
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[ Sample Extraction ] ➔ [ Sample Transport ] ➔ [ Conditioning ] ➔ [ Online Analysis ] (Nozzles/Probes) (Sizing/Velocity) (Temp/Pressure) (Chemical Sensors)
: In a two-phase flow (like saturated steam containing water droplets), a standard probe might miss heavier particles or droplets because they have more momentum than the steam around them.
ASME PTC 19.11 is part of a broader family of ASME Performance Test Codes (PTCs). It is specifically one of the "Supplements on Instruments and Apparatus," providing detailed guidance on measurement devices used in conjunction with other primary test codes. It is commonly referenced by other major PTCs, including:
Steam is the lifeblood of the power industry, but it is rarely perfectly dry. As steam travels from the boiler to the turbine, it inevitably collects moisture. This moisture represents a direct loss of energy (latent heat) and poses a physical threat to turbine blades through erosion and scaling.