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FEATURE SPONSOR


as providing additional structural rigidity to the foundation itself, sparked the rapid development of MasterFlow 9600 as a low cost void-filler material which offered a medium strength, durable and volume- stable protective barrier for the bolts which made the structural connection.


Both offered a material which was delivered in bulk silos, which removed the need for the cranes, and overhead lifts, normally associated with ultra-high strength grouting operations. In place of these came a grouting operation which was now more autonomous, faster, cleaner and safer resulting in a significant improvement in offshore productivity.


GOOD CONNECTIONS Regardless of foundation or material type, the raison d’être for any grouting subcontractor is to deliver a good quality, fit for purpose grout to the annulus of the connection. This fundamental obligation is achieved through tight quality control during the mixing and pumping process and involves density, air content and flow measurements. However even after


these ongoing quality checks, it may still be desirable, where possible, to check the grout’s density at the connection, to ensure that any grout, which lies within the structural connection, has not been diluted by the water which it has displaced.


All grout is pumped from the bottom up and, more often than not, displacing water on its travel up through the connection. If the connection terminates above the water, checking the density is just a matter of sampling the material at the top of the connection to ensure ‘good’ grout is present. If however the connection is subsea then this becomes more of a challenge.


In such circumstances the two most common solutions are either to pump an overage of grout, to ensure that only ‘good’ grout remains in the connection, or measure the density by using a probe at the top of the connection, called grout density monitoring, or GDM. This service was developed at FoundOcean with the help of Atomic Energy Research


GROUTING


Establishment in the 1970’s, now known as the UK Atomic Energy Authority and is still the most reliable method of ascertaining a grout’s density subsea. Although this service has been used in the oil & gas market for many years, it is only recently being employed in offshore wind in order to minimise any impact that may occur by pumping excessive overage into the environment.


The ROV-based system operates on the principle that the radiation emitted by a source and received by a detector is attenuated by the material flowing in the space between the two. The relationship between the degree of attenuation and the material density may be established by calibration of the density probes prior to deployment. A similar approach is used to establish whether members of a foundation are flooded due to corrosion or impact damage, this service called flooded member detection, or FMD, has been part of the company’s service offering since the 1970’s and has successfully identified numerous at-risk offshore assets around the globe.


MASTERFLOW 9800: THE FIRST EVER BULK SUPPLIED OFFSHORE GROUT WITH TYPE APPROVAL CERTIFICATE


SAFER, FASTER, BULK SUPPLIED


MasterFlow 9800 considerably enhances the grouting operations and revolutionizes the productivity and safety during the grouting works. Convenient transport in bulk silos and a continuous mixing and pumping process make the material easy and much faster to apply.


www.master-builders-solutions.basf.co.uk


www.windenergynetwork.co.uk


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