Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1995-01-04
1997-08-26
Walton, George L.
Fluid handling
Processes
Cleaning, repairing, or assembling
137318, 138943, 138 97, F16K 4300
Patent
active
056601999
ABSTRACT:
A method of hot tapping a pipeline includes the step of providing a valve having a valve body, a bonnet on the valve body, and means in the form of an isolating mechanism for enabling a user to seal the valve body from the bonnet for purposes of removing the bonnet with the valve in use. The method proceeds by (i) connecting the valve body to a line to be tapped and a hot tapping machine to the valve body; (ii) hot tapping the line through the valve body with the valve open, withdrawing the hot tapping machine from the valve body, closing the valve, removing the hot tapping machine, and connecting a desired downstream component; (iii) sealing the valve body from the bonnet with the isolating mechanism; and (iv) removing the bonnet from the valve body. In line with the above, a valve for hot tapping a line includes a valve body, a movable gate, a removable bonnet with a gate actuating mechanism, and a bonnet isolating mechanism for enabling a user to seal the valve body from the bonnet for purposes of removing the bonnet.
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Manual entitled "Line Stopping and Equipment Options" published 1992 by International Flow Technologies, Inc.
Manual entitled "Hot Tapping and Equipment Options" published 1992 by International Flow Technologies, Inc.
Product Brochure for a Rovalve Figure 220 Bonneted Knife Gate Valve Published 1192 by Technaflow, Inc.
Product Catalog entitled "American-Darling Butterfly Valves" published 1992 by American Cast Iron Pipe Company of Birmingham, Alabama.
Hanson Loyal McKinley
Walton George L.
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