Joint for plastic lined metal piping with reduced diameter pipe lap
AssigneeUnidynamics Corporation
InventorIrving D. Press
Life of this patent
Estimating the term…
Abstract
A seal load ring having parallel radial faces is installed between the flared gasket portion of the piping plastic liner and the lapped end of a section of metal piping. The plastic engaging face of the ring is provided with a plurality of concentric circular grooves to resist plastic cold flow. The pipe lap has a significantly lesser outside diameter than the outside diameter of the seal load ring, only sufficient to support the joint connecting forces, thereby permitting easier and more economical fabrication of the pipe lap and permitting the use of less ductile less expensive pipe.
Claims10
A lined piping assembly comprising in combination a component of metal piping having a connector portion flared radially outwardly at a predetermined angle to form a pipe lap having a rearwardly facing surface engageable by a pipe flange and having a forward facing surface;
- a seal load ring having an inside diameter substantially matching that of said connector portion, a first face engaging said forward facing surface of said pipe lap, and a radical face on the side away from said first face;
- a plastic pipe lining extending out of said connector portion, through said load ring, where it is flared radially outwardly over said radial face of the seal load ring to form a gasket portion and thereby trap said seal load ring;
- the radial dimension of said pipe lap between its inside and outside diameters being at least 20% less than the radial dimension of said seal load ring between the inside and outside diameters of the latter;
- a pipe flange encircling said piping component behind said pipe lap for engaging said rearwardly facing surface of said pipe lap to urge said connector portion axially and said plastic gasket portion against a mating surface of another component.
Dependencies are inferred from the claim text.