Flanged joint sealing nut

Details Flanged joint sealing nut Flanged joint sealing nut

1979-04-13

1981-10-13

Cohan, Alan

Fluid handling

Processes

Cleaning, repairing, or assembling

285 15, 285368, 285382, 294011, F16L 5518, F17D 300

Patent

active

042942756

ABSTRACT:
The nut is for repairing leaking bolt holes in flanged pipe joints by means of a closed-end nut having a sharp circular projection on its open end. When this sealing nut is substituted for existing nuts on bolts in the flanged joint and tightened, the nut, which is hardened, cuts a circular groove in the face of the flange that makes a metal-to-metal seal to close leaks at bolt holes. The bolts may be same diameter as the existing bolts and may be installed one at a time to accomplish the repair without reducing pressure in the pipe. Leakage from between the flanges at their perimeter is closed off by sealing in a conventional manner by welding a band around the perimeter of the flanges before the bolt hole sealing is started.

REFERENCES:
patent: 3136220 (1964-06-01), Kamm
patent: 3912307 (1975-10-01), Totman
patent: 3924649 (1975-12-01), Totman

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