Spool & Jumper Metrology:
Due to a recurrent demand for spool piece or jumper metrology, PLSM has developed
a specific script for this application in his AQUA-
This script automatically managed the underwater units measurements and directly draw the metrology result in a CAD software, taking into account all mechanical interfaces offsets, in order to speed up the survey report and avoid processing error (as well as surveyor nightmare and headache…).
One Base is set up on each flange, the first one is called the Reference Base and defines the relative coordinate system, all results will be output according to this Base coordinate system (which is defined by the interferometric frame), the other Base is called the Offset Base and attached to the second flange. One Pointer is set up on a seabed support in order to create roughly an isosceles triangle (see sketch).
Pointer on frame
Each Base to flange mechanical interfaces have to be defined in an CAD drawing (.dwg) prior to starting the metrology (see in documentation how to define this interface).
A Pointer attached to and preferably powered by the ROV is linked up to the survey
room through a bi-
The metrology consists of four measurement steps:
Step #1: Measurement of Offset Base location from Reference Base,
Step #2: Measurement of Rotation locking Pointer from Reference Base,
Step #3: Measurement of Reference Base location from Offset Base,
Step #4: Measurement of Rotation locking Pointer from Offset Base,
All these acoustic measurements (four times Azimuth, Elevation and Distance) are
processed by AQUACAD to produce a final drawing of the metrology including the mechanical
interfaces, subsequently getting direct access to the flange-
The final metrology result is directly available in the CAD file (dwg) with quality check criteria:
To complete the metrology, the user has just to quote the flange-
Spool & Jumper metrologies using the AQUA-