Robert Treat Gilchrist
Engineers in Horn Creek, CO
License number
Colorado 33994
Issued Date
Sep 22, 1999
Renew Date
Nov 1, 2015
Expiration Date
Oct 31, 2017
Type
Professional Engineer
Address
Address
PO Box 269, Horn Creek, CO 81252
Personal information
See more information about Robert Treat Gilchrist at radaris.comName
Address
Phone
7621 County Road 253, Salida, CO 81201
2210 Main St, Longmont, CO 80501
1909 Fountain Ct, Longmont, CO 80503
4069 Hawthorne Cir, Longmont, CO 80503
114 Main St, Westcliffe, CO 81252
Professional information
Electrical Heating Of Pipelines With Pipe-In-Pipe And Mid-Line Connector
US Patent:
6292627, Sep 18, 2001
Filed:
Oct 4, 2000
Appl. No.:
9/679085
Inventors:
Robert T. Gilchrist - Westcliffe CO
Ronald M. Bass - Houston TX
Ronald M. Bass - Houston TX
Assignee:
Shell Oil Company - Houston TX
International Classification:
H05B 360, F16L 5300
US Classification:
392311
Abstract:
Apparatus and method for electrically heating a segment of a subsea pipeline are provided. Electrical power may be supplied about midpoint between the ends of concentric pipes. The annulus between the pipes electrically isolates the pipes, but at the ends of the segment the concentric pipes are electrically connected. The pipes may be electrically connected by bulkheads or by an insulating joint. A toroidal transformer may be placed in the annulus for extracting power at a selected location along the pipeline. An insulating joint allows power to be extracted from the ends of the heated segment. Extracted power may be used for pumps, other devices or for heating jumpers or other short segments of the pipeline. Contiguous segments of a pipeline may be heated, each segment having an electrical connection to the inner and the outer pipe intermediate the ends of the segment. A riser or segment of a riser having a pipe-in-pipe configuration may also be heated.