The Metrology Challenge

Short sections of pipeline are required to connect subsea infrastructure together. These short sections of pipeline are commonly referred to as ‘spool pieces’ or ‘jumpers’. Due to the product they carry, they are generally made of a rigid material, and therefore must be constructed on land, after the subsea infrastructure has been installed.

Highly accurate measurements are required between the hubs on the subsea structures and pipelines in order for the spool piece to be constructed within the tight tolerances required in order to join the two hubs together. The method of collecting these measurements is called ‘Metrology’.

There are several types of techniques currently available to support metrology surveys including; acoustics, inertial and dynamic laser scanning. Sonardyne is the only manufacturer with technologies to support all methodologies.