Inspections and audits

Inspections and audits

DNV GL provides independent assessment services at all stages of the project lifecycle.

Whenever a wind turbine and its components are inspected – at any stage from fabrication to periodic monitoring on site or investigation of damage – the key benefit for project developers, wind farm owners or investors is the objectivity of an independent evaluation and the information the inspection report reveals. DNV GL employs highly qualified inspectors with all the wind turbine expertise and experience to put clients in the picture.

Inspections may be carried out at almost any stage in a project lifecycle. At a vendor’s premises equipment can be inspected during or after fabrication, as it leaves the premises or on delivery to a wind farm site. A number of inspections are commonly performed on construction completion or during the operation of a wind farm, e.g. rotor, nacelle, tower, foundation and electrical system. Here, the main focus is on safety and structural integrity. Other inspections may include offline condition monitoring (vibration measurements), evaluation of lightning protection measures, an oil analysis or video endoscopy.

Periodic monitoring of all the turbines at a wind farm is recommended every two or four years. This provides a client with a thorough review of each turbine’s technical condition – information that can be useful in improving performance or obtaining an independent opinion of a turbine’s condition prior to a key commercial milestone (e.g. end of warranty of period). Inspections may also be necessary to fulfill regulatory or insurance requirements. 

If something goes wrong, a damage investigation can be most helpful in identifying the extent and type of the damage incurred and, crucially, in determining the root cause of the problem. An independent damage investigation report is important in finding a technical remedy to the problem, establishing responsibility for funding any repair work and putting in an insurance claim. These investigations may also be crucial in preventing further damage to other existing turbines.

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