Piping, matched to the chemistry — not the catalog page

Asahi/America's Chem Proline (Advanced PE, PE100-RC, SDR 11) is rated 150 psi minimum at 68°F over a 50-year design life and is H2-ready. In a real documented 2015 installation, 1/2" Chem Proline spool pieces replaced failing CPVC in 50% caustic service for a semiconductor OEM, fitted without redesign — a real field substitution, not a theoretical spec upgrade.

Single containment is one pipe carrying the fluid with no secondary barrier. Double containment adds a carrier pipe inside a containment pipe with an engineered annular space, a defined leak-detection method (discrete-point or continuous cable), slope, and drain location — the annular space is its own engineered system, not just 'a bigger pipe around the first one.'

Yes — per the Zero-Guesswork Material Specification gate, every wetted component needs to be named explicitly (pipe, fittings, valve seats, gaskets), because a single unexamined elastomer or gasket material can be the weak link in an otherwise correctly specified piping system, even when the main pipe material is right.

SEMI F57 extraction test data for wetted polymer components (and SEMI F41 for a full distribution system), ISO 14644-1 cleanroom fabrication classification, and real contamination-contribution numbers in ppb/ppt — not a general 'very clean' claim. A vendor should be able to produce the actual documentation, not just state compliance verbally.