Relation of Gaskets to Bolting.
 |
| gasket |
There is a tendency, as indicated in the ASME Rules for Bolted Flanged Connections, to assign lower residual contact-pressure ratios ranging from about 1 for soft-rubber gaskets to 6 or 7 for solid-metal gaskets. Whereas these are said to have proved satisfactory service for heat-exchanger and pressure-vessel flanges, the more severe service encountered by pipe flanges due to bending moments and large temperature changes is considered by many to warrant designing on the basis of the larger residual gasket compression ratios recommended in the previous paragraph. The lack of understanding of the mechanics of gasket action, the variety of gasket materials, shapes, widths, and thicknesses; the variety of facings used; the variation in flange stiffness; and the uncertainties in bolt pull-up are among the factors that render difficult a precise solution to the problem of gasket design.
Rules for bolting and flange design are contained in Sections III and VIII of the ASME Boiler and Pressure Vessel Code.
Rules for bolting and flange design are contained in Sections III and VIII of the ASME Boiler and Pressure Vessel Code.
The parts of Gasket now finish for a moment, and in the next post we will continue with Bolting, and still with Piping & Fabrication, and hope everything will be useful to us.
No comments:
Post a Comment