ADVANCED SUBSEA Metrology Services are based  on the following key features:

•  *Field-proven ROV operated  tools & methods optimized  for specific requirements,
•  * Experts in metrology  and acoustics involved at early stage of projects,
•  * Smart interfaces with Users and ROV spreads,

This Deep Water Hybrid Metrology  Service is the result of the cooperation of CYBERNETIX and ADVANCED SUBSEA (HM-TOOL© based method). This Service is available in GoM, Brazil and West Africa for Oil&Gas companies, Installation Contractors, ROV Construction Support Subcontractors.
 

1- Hybrid Metrology Services

This ADVANCED SUBSEA’s service is based on the deployment and operation of an Hybrid Metrology Tool (HM-TOOL©) built of a fully instrumented Taut-wire based System, coupled with an Acoustic based system.
* Both systems are operated at the same time, from the same frames tied to each structure flanges/HUBs,
* This allows to determine Jumper/spool  fabrication parameters (max range 100m/330 ft) with a very high accuracy using 2 independent methods.
* Automatic QC of readings and cross-comparison of results allow Barge/Vessels superintendent to make very rapid decision.
 

2- HM-TOOL © (patent pending)

HM-TOOL is a new ROV deployed-metrology tool based on two concurrent technics : Taut Wire and Acoustics It provides in real-time :
*     3D-Offsets/attitude/orientation of each flange from EHF Inclinometer-Transponders,
*     3D-Offsets/attitude/orientation of each flange from Taut Wire tool derived parameters,
*     QC, display and logging on surface unit,
*     Dual presentation of Results issued from these 2 independent methods.

QC and Cross-comparison  of  results provide final reliable results  and  save Construction  Vessel  time
 

3- Measurement Accuracy
 
 

PARAMETER	ACOUSTIC METROLOGY METHOD	TAUT WIRE METHOD
RANGE MEASUREMENT ACCURACY	<20 mm	< 20 mm (up to 100m/330 feet)
DEPTH DIFFERENCE ACCURACY	< 30 mm	< 30 mm
PITCH/ROLL  ACCURACY	< 0.2 DEG	<  0.2 DEG
HEADING ACCURACY	<  0.3DEG	<  0.3DEG

4- Recent References in Metrology

- GIRASSOL Spool Metrology  back-up system - BCD BESPS Subsea Metrology Procedure and Tools  -