Double containment pipe fitting
AssigneeEnfield Industrial Corporation
InventorsJohn Allen, Alec Ewen, Robert Gurney
Life of this patent
Estimating the term…
Abstract
A double containment pipe fitting and method of making same is disclosed. The fitting includes a branch double containment pipe section butt welded to a double containment pipe header, or main section to form a fitting wherein the branch section extends away from the header section. The header and branch section primary and secondary pipe portions contain distinct engagement surfaces which are joined together to form the fitting. A unique, non-planar heating element having opposed heating surfaces is brought into contact with the main and branch pipe sections to soften the plastic for welding purposes which are then joined together in a manner such that the respective centerlines of each pipe section intersect.
Claims15
A fitting for use in installation of double containment piping systems, comprising a header section having a primary pipe portion located within an outer secondary pipe portion thereof, a branch section having a primary pipe portion located within a hollow secondary pipe portion thereof, the header and branch sections each having a distinct longitudinal axis, said header section primary and secondary pipe portions and said branch section primary and secondary pipe portions being joined together at a joint of said fitting in a manner such that said header and branch section longitudinal axes intersect, said joint being defined along respective opposing engagement faces of said the header and branch section the engagement face of said header section including pair angularly divergent, intersecting a surfaces formed in each of said header section primary and secondary pipe portions and the engagement face of said branch section including pair of angularly divergent, intersecting surfaces formed in each of said branch section primary and secondary pipe portions.
A prefabricated pipe fitting for a double containment piping system in which hollow primary pipes are supported within hollow outer, secondary pipes, the primary pipes being separated from the secondary pipes by an annular space, the fitting comprising a double containment main pipe spool and a double containment branch pipe spool, each of the main and branch pipe spools having distinct primary and secondary hollow pipe portions, each of said main and branch pipe spools having a distinct longitudinal axis, said branch pipe spool being offset from said main pipe spool such that said branch pipe spool longitudinal axis intersects with and is further disposed at a predetermined angle from said main spool longitudinal axis, said main pipe spool primary and secondary pipe portions each having a pair of intersecting engagement surfaces, said branch pipe spool primary and secondary pipe portions each having a pair of intersecting engagement surfaces, said main pipe spool primary and secondary pipe portions being interconnected to said branch pipe spool primary and secondary pipe portions along their respective pairs of intersecting engagement surfaces, whereby said each of said branch pipe spool primary and secondary pipe portions are offset from their opposing main pipe spool primary and secondary pipe portions at said predetermined angle.
Dependencies are inferred from the claim text.