Lubrication and Safety in Compound Pressure Vessels
Various types of high-pressure apparatus utilize Compound cylinders to contain pressures in the range up to about ten GPa (100 kbar). Compound construction vessels usually consist of a high strength innermost die preloaded in compression by surrounding concentric support rings. Figure 1 shows a cross-section of such a vessel typical of a piston-cylinder apparatus for use to 7 GPa (70 kbar). The compressive preload on the innermost ring is achieved by inserting the die and its adapter shim into the tapered ID of the binding ring assembiy with a substantial interference fit. The preload pressure on the OD of the die ranges from about 1.5–2.0 at higher pressures. Thus for bore lubrication, 25 μm (.001 in.) thick lead foil emerges as an effective and critical lubricant.
KeywordsMaraging Steel Nominal Pressure Insertion Force Piston Displacement Tapered Surface
Unable to display preview. Download preview PDF.
- 1.T. E. Davidson and D. P. Kendall, in Mechanical Behavior of Materials Under Pressure, Vol. 55, H. Ll. D. Pugh, ed., Elsevier Publishing Co., Ltd., Amsterdam, Netherlands (1970), p. 118.Google Scholar
- 2.J. Boyd and B. P. Robertson, ASME Trans. 67, 51 (1945).Google Scholar
- 3.G. R. Hyde, M. S. Thesis, Brigham Young University, Provo, Utah (1957).Google Scholar