Spacer
News
News > Pre-Function Testing Underwater Umbilicals

Pre-Function Testing Underwater Umbilicals

  07/12/2009
Subsea 7’s self-contained underwater umbilical testing system, engineered by MacArtney, takes testing to the sea bed, making it faster and more convenient to test in situ. At depths of around 380 metres, newly installed umbilicals in the Vega field in the Norwegian sector of the North Sea can be a challenge to test. Instead of bringing the umbilical to surface to test, the new system will lower testing connectors down to the cable. Lowering testing equipment to the seabed will save time and lower costs.

Test equipment of Subsea7
Traditionally such testing requires one end of the cable to be attached to a ship on the surface, where insulation and conductor resistance and time domain reflectometry can be measured.
MacArtney designed a self-contained testing system with an electrical and fibre optic downline. The connector garage is lowered to the umbilical by winch and attached to connectors on the umbilical by ROV. Much like an underwater extension cable, the self-contained system measures insulation resistance, conductor resistance and time domain reflectometry.


The topside junction is placed and operated on the vessel and is designed to operate even during harsh weather conditions. The subsea junction box can withstand pressure of at least 50bar and can be operated at depths of at least 500 metres.


The system tests the umbilical section-by-section, pre-commissioning the entire length of the umbilical flow line system before it is taken into use.

 





Read more about:
 vessel  ROV 
Supplier: MacArtney Group
More news from this supplier:
Articulating A-Frame to Save Time and Improve Safety
Offshore Wave Power Brought Onshore
Sim Search, Locate and Retrieve
Live Underwater Action for MacArtney
Mooring Communications System
Monitoring Reliability in Tough Conditions
Acoustic Imaging Reveals Lost Town
SubConn Acquires Cornerstone
Fast Sidescan Survey with FOCUS-2
Underwater Winches Ensure Sonar Data Quality

Award for Brazilian Hydrographic Paper
Demonstrating "Deeper Understanding"
First Real-Time Seafloor Earthquake Observatory
Theme Hydrography Day 2012 International Cooperation
Finistere and Mediterranean Bathymetric Lidar Surveys
Precise Positioning For BP Vessels
DP Inertial Navigation System for Drillship
Plug-and-work Protocol Adopted
Simulator Models Complex Sea Currents
Monitoring the Shipwrecked Concordia


     


Comments (0):
There are no comments yet.
Make your comment:
Name:
Your comment:
Type over the 2 words (or number) from the picture
 
Most Popular Articles Most Popular News Most Popular Jobs
Spacer
Spacer
 

Interactive

Hydrographic Survey for Riverbed Erosion

 

U.S. Geological Survey were out on the Missouri River at Williston, North Dakota, USA, performing a hydrographic survey to monitor the state of riverbed erosion. They were using a multibeam echo sounder which transmits sound energy and analyzes the return signal (echo) that has bounced off the riverbed or other objects. Multibeam sonars emit sound waves from directly beneath a ship's hull to produce fan-shaped coverage of the riverbed. 

Gage height at the Williston gage was approximately 27.65 feet when this video was taken. Additional information about the USGS streamgage at Williston is available at http://waterdata.usgs.gov/nd/nwis?program=nwisman&site_no=06330000

 

 Last 5 items:
 Hydrographic Survey for Riverbed Erosion
 Introduction to GEBCO
 MCA on Surveying the British Coast
 Surveying in the Port of London
 Venessa O'Connell on Hydrography
 
Spacer
Spacer
Spacer
Spacer
Poll

What is More Interesting for Hydrographic Surveyors?
Spacer
Spacer
Spacer
Spacer
Spacer
Spacer