Cyclic Hydrostatic Pressure Tests for thermoplastic and FRP (Fiber-Reinforced Plastic) pipes typically involve subjecting the pipes to varying pressure levels in a repeated manner. This assesses their durability and resistance to fatigue over time. Standardized testing procedures, such as ASTM or ISO standards, provide specific test parameters, including pressure levels, cycles, and duration. These tests help ensure the long-term reliability and performance of the pipes in their intended applications.