Overview

The Challenge
The overall objective of the Oman LNG Debottlenecking (DBN) Project is to increase production capacity of the LNG plant by replacing the existing helper motors and VSDS string on the MR compressors to a larger capacity.
Existing buried services and objects pose a significant risk to the success of installing brownfield foundations and underground services. Existing as-built/in-place drawings indicate the locations of buried services and foundations; however, these may not always be fully accurate or complete.
The Solution
G Map LLC proposed an underground utility locating field-survey (GPR) to identify all existing buried services and objects, which might affect or be affected by the upgrade works. This information is required for the design phase to prevent inappropriate placing of equipment, foundations, trenches and pipe runs, and subsequently during the construction phase to prevent unscheduled clashes with existing services;
Benefits
Non-destructive GPR technology makes no damage on the subsurface, environment or surrounding people. Latest GPR technology makes use of 2 different frequencies to detect shallow and deep utility services simultaneously. Dual-frequency antenna to detect deep and shallow targets simultaneously. The 700 MHz antenna permits the user to see small shallow targets, depending on the soil conditions (up to 2m). The 250 MHz antenna permits the user to see bigger targets situated deeper underground (up to 5m). Similar to having a test trench or boring along the whole length of the project without digging. The proposed technology could detect & trace metallic, Non-metallic, pipes, fiber optics, active and non-active utility objects in combination with CAT detector with Genny. 
Utility Detection Radar finds all potential threats, including non-conductive pipes and fibre optics, increasing safety by lowering the risk of accidently hitting underground assets. Increase safety, speed up work and lower asset management costs with the ability to prevent hazardous outages and collect more information.
The Solution
The client were able to not only understand the trace of their underground services, but also improved the accuracy of their data with GPS integrated GPR survey results. The old existing as-built utility maps were updated with the newly surveyed information and the same has been verified at site. The proposed technology could replace the requirements of multiple trial pits and excavations at highly risky compressed gas project environment. This technology reduced a huge amount of time, resources & money. The final data showing the existing utility Easting, Northing and depth information were successfully used to verify the proposed design. 
The new GPR technology reduces manual excavation, verification, eliminates time-consuming analysis, and provides a higher level of quality assurance. The client design staff can now perform their design operations like rerouting the existing facilities, proposal for new trenches more efficiently and effectively with confidence