What are the inspection standards for PTFE-lined pipes?

Fluorine-lined pipes, fluorine-lined storage tanks, PTFE storage tanks, PTFE pipes standards QB/T4877-2015, QB/T3624-1999, PTFE pipes, steel-lined PTFE pipes HG/T20538-2016. Temperature range: -196℃ to 250℃, corrosion-resistant, capable of withstanding 1500V voltage, dispersible PTFE, suspended PTFE powder, large bendable area for dispersible PTFE, less prone to bending—this is the difference in flexibility. Dispersible PTFE materials are very expensive. Inspection technology standards for steel-plastic composite lined PTFE pipes include: visual inspection for welds and surface smoothness, followed by standard dimension checks for steel thickness, outer diameter, bolt holes, and inner PTFE lining thickness; hydrostatic testing, electrical discharge testing, and quality document reports.