Pipe joints or couplings – With casing – lining or protector – Lined
Patent
1978-07-20
1981-08-04
Arola, Dave W.
Pipe joints or couplings
With casing, lining or protector
Lined
285 14, 285351, 285363, 285416, 285DIG18, F16L 914
Patent
active
042818591
ABSTRACT:
The invention relates to means and methods for rendering fire-safe, or more fire-safe, steel or like pipework which is lined with a plastic or like liner. At joints in such pipework, the liner is brought out over the flange face to form the actual seal. Consequently, the liner is vulnerable to fire or other forms of external heat at the joints.
In accordance with the present invention, a metal ring is provided around the periphery of the liner at each joint to protect the liner from fire. The metal ring is not intended to provide a complete seal if the seal between the liners should fail, but is does prevent any large escape of the contents of the pipework.
The ring may take various forms and may be, for example, a resilient ring of either U-section or M-section. Alternatively, the ring may be of flat-section and may slide on lips formed on inserts arranged between the flanges and the liners. These inserts may be arranged to provide the additional advantage of removing the need for special flange welding and machining.
REFERENCES:
patent: 2201862 (1940-05-01), Heisterkamp
patent: 2356047 (1944-08-01), Geisinger et al.
patent: 2356047 (1944-08-01), Geisinger et al.
patent: 2592419 (1952-04-01), Harper et al.
patent: 2998984 (1961-09-01), Gressel
patent: 3248108 (1966-11-01), West
Arola Dave W.
Le Carbone (Great Britain) Limited
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