ASME publishes free "Interpretations" documents on their website. These are answers to specific technical questions about PTC 19.11—such as "How do we handle two-phase sampling at low flow?" While not a substitute for the PDF, they provide high-level guidance.
Steam and Water Sampling, Conditioning, and Analysis in the Power Cycle Asme Ptc 19.11 Pdf
Solid particles or liquid water droplets carried into a high-speed steam turbine act like sandblasting projectiles. PTC 19.11 defines how to accurately sample steam to ensure it meets purity limits (typically <0.02 ppm of solids for high-pressure turbines). Asme Ptc 19.11 Pdf