Plastic Pipes Conference Association # 2023 Lake Buena Vista
Ali M Alghamdi, Recep Yaldiz, Faisal Almana, Yousof Ghazzawi, Abdul Rahim Arafath, Ratnesh Khandelwal, Azzedine Kioul, Turki Al-Shahrani, Salem Al-Anazi, Sarfraz Abbasi, Mohammed Aljasser, Parthipan B, Kavya A, Harm Caelers
Reinforced thermoplastic pipes (RTPs) are multilayer structured pipes reinforced with high-strength materials such as fibers (glass, aramid, or carbon fibers). RTPs are used to transport highly corrosive mediums at elevated pressures and temperatures. An example of that is the use of RTP in the Oil & Gas industry to transport oil containing aliphatic and aromatic hydrocarbons, water, hydrogen sulfide and carbon dioxide at temperatures exceeding 82°C and pressures exceeding 100 bar. Those pipes gained popularity as a replacement for the incumbent steel pipes with great success. This stems from their exceptional strength-to-weight ratio, chemical resistance, spoolability, and long-term reliability. In this work, high-density polyethylene (HDPE) resins classified as PE4710, PE100, and PE-RT II have successfully been qualified and validated for RTP liners and jackets. Unidirectional glass fibers reinforced high-density polyethylene (GPE) tapes have also been evaluated for RTP reinforcement layer. The qualification is based on industry standards such as API 15S.
This paper demonstrates the validity of predicting an RTP performance with finite element analysis (FEA). Conventional shell elements were used to model the RTP, while appropriate boundary conditions were selected to represent the end-fittings used for testing. The burst pressure of an RTP can be predicted by selecting an appropriate failure criterion for the composite laminate. In order to validate our FEA models, RTPs with outer diameters (4” & 5”) were evaluated as representative case studies.
The suitability of HDPE resins for the application was assessed by generating data on tensile creep at room and elevated temperatures according to ASTM D2990 and compression creep at 85°C. Furthermore, the effect of swelling by a mixture of aromatic and aliphatic hydrocarbons on polyethylene’s mechanical performance was examined by exposing coupons of the material to those fluids at the operating temperatures of the pipes, followed by tensile tests. Additionally, the suitability of the GPE tape for the application was assessed based on short-term properties.
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