Our operations comply with the ADC Consensus
Standards for Commercial Diving Operations, and
with OSHA & USCG Regulations.
 
 

pipeline depth of cover and hydrographic surveys

Pipeline Depth of Cover Studies
Gas and oil pipelines are required to be buried to specific depths below grade depending on their location. For instance, pipelines buried beneath agricultural areas, residential areas and inland bodies of water all have different depth of cover requirements. These pipelines must have depth of cover studies performed every five years and in some states depending on certain conditions every three years.



 

For pipeline depth of burial projects UCI utilizes the most modern piece of underwater equipment, the Optimal Ranging FieldSens Underwater Utility Mapping System. In combination with a vessel’s echo sounder, the difference between bottom depth and utility depth can provide depth of cover measurements, with each value accompanied by a confidence interval. FieldSens relies on Bluetooth and IEEE 802.15.4 wireless technology to integrate sub-centimeter DGPS, echo sounder, and tow cable length measurements. Surveys can be performed in deep water, shallow water and even on land. The same basic equipment setup can be used to track and plot cables and their depth of burial. For those clients that wish to have manual confirmation performed, we can provide you that service by probing to the pipeline with divers.

Hydrographic Surveys
Many marine construction and underwater inspection projects require hydrographic surveying to be performed. This work also known as bathymetric, bathometric, or fathometric surveying all serves the same purpose; to obtain a representative image of the submerged bottom and many times this work is performed to identify the presence of scour around submerged structures. Often these surveys are mandated prior to the start of a construction project and then performed again following completion of the work. UCI performs hydrographic surveys with the use of a high accuracy single beam or multi beam echosounder. The location of each reading obtained is provided by the use of a sub-centimeter accuracy Differential Global Positioning System (DGPS). The information gathered is then processed through the use of Hypack Hydrographic Surveying and Processing Software to produce a color plot of the bottom with contour lines so that elevation changes can clearly be identified. The results are also presented in an ASCII file so that each location will be identified by a northing, easting, and elevation.

For clients searching for submerged objects we can perform magnetometer or gradiometer surveys for ferrous metal objects or side scan sonar surveys to assist in locating other sunken debris. We even have the capability to perform sub-bottom profiling to get a picture of what’s below the mudline.

Contact us for more information on how we may serve your needs.