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Métrologie de Spool & Jumper

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-CAD software.

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…).

Direct Flange-to-Flange Spool piece Metrology configuration

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).

AQUA-METRE R3000 Base on 20” flange

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-directional RS232 channel and acts as the Communication Master, thus sending commands to and receiving results from the others units working on batteries (2 Bases and one Pointer in this case).

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-to-flange dimensions.

The AQUA-CAD metrology script window appears like this:

AQUA-CAD screenshot when using the spool&jumper metrology script

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-to-flange distance, horizontal angles and vertical angles.

For more details, please check the R300/R3000 metrology documentation.

Metrology results:

Spool & Jumper metrologies using the AQUA-METRE R3000 or R300