Materials, Manufacturing Process, and Factory Pressure Testing The high-pressure manifold is a pressure-bearing special equipment component (Category I pressure vessel component); its manufacturing and inspection follow the API standards of the petroleum industry. 1. Materials: The main body fittings are made of high-strength chromium-molybdenum alloy steel, featuring high tensile strength, impact resistance, and fatigue resistance. The inner wall of the fittings can be hard
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