Development of 6,000 m class cylindrical pressure-tight housings using ceramic cylinders and metal caps

We developed 6,000 m class cylindrical pressure-tight housings using ceramic cylinders and metal caps. The housings have a simple structure, comprising ceramic cylinders, aluminum alloy caps, and couplings between the ceramic cylinders. They are considerably lighter than metal housings. We applied nonlinear finite element analysis (FEA) to evaluate the stress distribution. Results show no stress exceeding the strength of the ceramics in the ceramic cylinder. Also, the plastic deformation of caps reduced stress concentration at the ceramic cylinder edge. Pressure tests confirmed its reliability against hydraulic pressure and water sealing.