Adkham Izbassar, Bob L. Herd Department of Petroleum Engineering, Texas Tech University
This study investigates the short-term pressure integrity and cyclic fatigue performance of transparent Cellulose Acetate Butyrate (CAB) piping designed for multiphase (gas–liquid) flow visualization under moderate pressure conditions. The experimental setup included a horizontal 3-inch CAB pipe segment coupled with a steel upstream section via pressure-rated Victaulic mechanical fittings. The system was hydrostatically tested and subjected to cyclic pressure loading between 50 and 400 psi for eight hours, simulating the conditions of a gas-lift production line operating at 500–600 psi. The primary objectives were to assess leak tightness, burst pressure, and fatigue resistance, and to evaluate the feasibility of CAB as a transparent alternative to opaque metallic or composite pipes. Results showed stable structural performance under repeated cycles with no observed leakage or deformation within the test window. CAB’s behavior under pressure confirmed its applicability for visual diagnostics and flow experiments when operated within its allowable stress limits and protected from ultraviolet exposure. Recommendations for fitting selection, testing protocol, and future long-term cyclic fatigue assessments are provided.