Flanged joints are the most common type of remarkable pipe joint and, given the correct gasket and bolt loading, their application is usually successful. However, there are certain circumstances arising out of operational considerations where an alternative jointing method is needed. External corrosion can make bolt removal difficult, gaskets can be over or under tightened by poor fitting practice, and the mass of the flange may be structurally undesirable. This paper and long term integrity are not sensitive to the skill of the maintenance personnel. The design concepts are first given leading to the description of the coupling itself. To verify the structural integrity of the coupling, an experimental stress analysis of the device has been performed under combined loading: pressure, bending and shear force. An account of field experience concludes the paper...
This paper presents the design and details of a pipe joint and closure for use in a wide variety of pressure vessel and piping applications including: petrochemical, marine, nuclear, electric utility and synfuel, in low as well as high pressure. The pipe joint consists of a pair of hubs locked together by a multi-grooved split coupler retained, in turn, by a tapered ring.
Comparison is made to a bolted flange demonstrating that the grooves direct forces through the coupling in a manner resulting in a substantially reduced level of stresses – effectively eliminating the causes of leakage in bolted flanges. This method of load transmission further results in a compact coupling of significantly reduced weight and size, Figure 1, yielding numerous advantages over not only bolted flanges, but also, other couplings.