Pressure Housing

The pressure housing is a critical component of a flex joint that provides the primary containment for pressurized fluids. It forms the outer shell that maintains structural integrity under operational pressure loads while allowing controlled angular movement through the flex joint's articulation mechanism. This housing protects internal components from external environmental factors and prevents pressure loss. Constructed from materials such as high-strength alloy steel, stainless steel, or duplex stainless steel, the housing is designed to withstand specified operating pressures and temperatures. For reference, typical operating pressure ranges from 1.0 to 1.6 MPa, with a burst pressure of 4.0 to 6.4 MPa (minimum 2.5 times operating pressure). Operating temperature is limited by elastomer seals to -40 to 85 °C. Nominal diameters range from 50 to 300 mm (ISO 7005), with wall thicknesses from 5 to 20 mm depending on pressure rating. Material grade 316L (ASTM A182) is common, with surface roughness for sealing surfaces of 0.8 to 1.6 μm Ra. Tensile strength (minimum for 316L) is 485 to 620 MPa, yield strength 170 to 310 MPa (ASTM A370), and hardness 79 to 95 HRB (ASTM E18). Weight ranges from 5 to 50 kg depending on size and wall thickness. Pressure testing is performed hydrostatically at 1.5 times rated pressure. These values are directory references and must be verified for the specific model and application with the legal manufacturer or supplier. The housing's design ensures a sealed environment through rigid construction and connection to adjacent piping components, withstanding internal pressure forces through material strength and geometric design.

The pressure housing functions as a pressure vessel that contains fluid under pressure while accommodating the flex joint's angular deflection. It maintains a sealed environment through its rigid construction and connection to adjacent piping components, withstanding internal pressure forces through its material strength and geometric design. The housing is designed to operate within specified pressure and temperature limits, with elastomer seals providing a barrier against leakage. During operation, the housing experiences internal pressure that creates hoop and longitudinal stresses, which are managed by the material's tensile and yield strengths. The articulation mechanism allows controlled angular movement without compromising the pressure boundary. Verification of the housing's integrity involves hydrostatic testing at 1.5 times rated pressure, and periodic inspection for corrosion, wear, or seal degradation is recommended.