GIPSEA - Metrology
Reduce vessel time with enhanced accuracy for modern offshore survey operations.
QUICK FACTS
Enhanced efficiency over traditional metrology methods
Complete metrology survey in <3 hours - results immediately after data collection
Multiple tools - Depth rated up to 1000m & 3000m
ABOUT
IPOZ GIPSEA® Inertial Metrology™ system is a depth rated survey instrument for the accurate measurement of positions, distances, depths and full orientation (heading, pitch and roll) of any underwater structure, in particular future pipeline jumper locations (“metrology”) even with no “acoustic line of sight” between receptacles.
The IPOZ GIPSEA® Inertial Metrology™ instrument has the same accuracy as traditional acoustic network methods (tripods) plus gyroscopes and depth sensors, but this is a single tool held by the ROV arm with an umbilical (like a gyro) and can complete the whole survey in a few hours (one single dive).
WATCH THE PROCESS NOW
GIPSEA Metrology is perfect for
Offshore Metrology Operations
ROV operations
Underwater Structures Measurement
Pipeline Operations
SPECIFICATIONS & ADVANTAGES
Proven Free-Inertial Metrology with enhanced efficiencies in data collection to the Offshore market.
Between the pipeline network ending at a manifold and the well heads, a piece of pre-fabricated spool is introduced. Since it must fit to extreme precision both in 3D position and orientation, the flanges are surveyed with care in a process known as spool jumper Metrology. Traditional Metrology methods such as acoustic network-gyro-bathy are slow, non-productive and affected by interference and multipath.
We offer the Free-Inertial Metrology method where the full metrics are collected completely autonomously in 1 single ROV dive.
+ Real Time Accuracy
- 3D position: 0.1m per km between Receptacles, (1/1000)
- Heading: 0.05 degree
- Pitch and Roll: 0.02 degree
+ Post Processed Accuracy
- Horizontal Position: < 0.05m average for metrology
- Depth: < 0.20m average without depth sensor
- Depth: < 0.05m average with depth sensor
+ Comms
Linked to the ROV via an umbilical, the GIPSEA requires an RS232 or RS422 link at 38400-115200 bd. It is controlled and monitored by a simple Windows XP or later computer and can stand short comms interruptions. Needs comms only for alignment and update command, and record fixes.
+ Power
- 10-30v (battery compensates for short outages)
- 1.5 amps at 24V when battery is charged (3 to 4.5 amps to charge and survey simultaneously)
- Battery lasts for 3h of operations
- In case of power outage 6 hour battery is optional
+ IMU Specifications
- Vibration: Mil-Prf-71185
- Shock: Mil-Prf-71185
- Power Mil-Std-1275A
- Power consumption: <25W data-preserve-html-node="true" data-preserve-html-node="true"
- Operation temp: -54C +71C
- MTBF >20,000h
+ No More Network
To complete traditional acoustic metrologies, a number of acoustic Compatts must be lowered to the seabed, some of them mounted in tripods. An ROV must then take them one by one and locate them precisely in places where they will have an “acoustic line of sight” between them and with the points to survey, where other beacons are also placed.
If there is no interference and multipath, the acoustic network then exchanges pings for hours to compute distances between each point, and an experienced acoustic surveyor must compensate carefully for the network. All this takes days and provides only one straight line distance.
+ No More Massive Hard Pool
Simply lowering all acoustic beacons to depth, then moving them to the right location and then retrieving them at the end of the project requires days of ROV and vessel time, accuracy and productivity. In contrast, the IPOZ GIPSEA® Inertial Metrology system will complete a full 3D metrology measurement (all lengths, depths and orientations) in a few hours. The results are available within 1 hour of the end of the survey, often before the ROV is back on deck.
+ No More Gyro Loop
In traditional metrology, the ROV must dive again to do gyro surveys between the various points, to obtain the orientation of the future flanges of the jumper.
+ No More Depth Loop
The ROV must dive again to do depth measurements between all points. Depth will have to be corrected for underwater sound velocity, tides, heave etc.