Underwater trencher with pipelaying guide

Patent · Tue Mar 11 00:00:00 EST 1986

OSTI ID:5783717

Hemphill, D P; Scott, P R

A method is described for laying a relatively stiff pipeline into a soil trench beneath ice covering water, the soil trench having sidewalls susceptible to collapsing. The method consists of: cutting an elongated slot in the ice; forming the trench beneath the ice slot; positioning an elongated shield in the trench to prevent the sidewalls of the trench from collapsing; guiding the pipeline through the ice slot and into the trench shield with an adjustable carriage which arcs the pipeline just before the pipeline passes through the ice slot and controls alignment and angle of entry of the pipeline into the trench shield; and deflecting the pipeline into the trench so that the pipeline enters the trench at one end of the shield and approaches the bottom of the trench before exiting at the other end of the shield.

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): US 4575280
• OSTI ID: 5783717
• Resource Relation: Patent File Date: Filed date 16 Dec 1983
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
42 ENGINEERING
PETROLEUM
TRANSPORT
PIPELINES
POSITIONING
ALIGNMENT
DREDGING
EMPLACEMENT
ICE
INCIDENCE ANGLE
SOILS
STRATA CONTROL
UNDERWATER OPERATIONS
WALLS
ENERGY SOURCES
FOSSIL FUELS
FUELS
022000* - Petroleum- Transport
Handling
& Storage
420205 - Engineering- Transport & Storage Facilities- (1980-)