Keep it Simple.
Welcome. We are glad that you have visited our site. We have designed this site to be as simple as possible. Here, you can select components to the bolted flanged joint [nut, bolt and gasket] with confidence. Here, you learn how it really works.
Modern Bolted Flanged Joint Design is almost foolproof; it’s hard to get it wrong. Thank the original designers for their genius. Follow their guidance. The joint is complex. It’s the weak point in a piping system so it needs to be sturdy and simple - simple to engineer, simple to specify, and simple to assemble.
A study of the bolted flange joint includes a solution of the statically indeterminate structure. This engineering problem revolves around the elastic modulus of components relative to one another. Rubberlike gasket behavior, namely,rubber/elastomer, compressed fiber and spirally wound gaskets contained within a centering ring are phenomena; its elastic modulus is undefined. Thus, an engineered solution to the problem is empirical - an educated guess. Assembly is empirical, know your skill level. To have a rational solution, one has to define phenomena.
After an exhaustive study of scientific methods, we have concluded: In ASME B31.1 and B31.9 Piping Code applications the Boiler and Pressure Vessel Code is the standard of care for the selection of components. Use their list. They did the work. Mitigate your risk. Bolting satisfies design philosophies. A designer experienced in Piping Code will know how to make the final decision and prove their solution.
The selection and assembly of components is simple. Select a gasket suitable for the media and temperature then select bolting from the ASME list suitable for the gasket and flange conditions. Gaskets don't have a pressure rating. Know how to read Boiler and Pressure Vessel Code and B16 flange standard specifications. The answers are there. Know the difference between mandatory and suggestion. Know what defective means.
In normal operating conditions, achieve a target torque value of 67% of bolting yield. When using rubber/elastomer gasket materials, and/or cast iron flanges with high strength bolting, over-compressing rubber or spirally wound gaskets presents trouble. Know the limits.
Earn your jump wings. Study the difference between gasket load and gasket stress, preload forces, resultant bolt load, bolting technology, material sciences, and the background of Modern Flange Design. The information we provided is not the standard of care. It is an offer in good faith for further study. Saint Ferrer® products are simple to select and simple to buy. Order by Model Number. It’s like a parts store. Now you can move on to what’s really important.