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Flange management


Practical experience has shown that a flange certificate is not always a guarantee of competence. Dijkgraaf Support has developed a unique method for carrying out flange competence tests. The aim of the tests is to ensure that flange fitters who do not meet the minimum quality requirements do not work on flanges.

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Flange competency testing

Dijkgraaf Support carried out around 4000 flange competency tests in 2018 and 2019, mostly at turnaround with large numbers of contractors.

In the Netherlands, the VCA certificate stipulates that contractor flange fitters must be in possession of the flange diploma WF(pr). Even though flange fitters have a flange diploma, knowledge levels and competence are often unsatisfactory. For major plant shutdowns, companies are particularly eager to test flange fitters in advance as a precondition for carrying out the work.


The method developed by Dijkgraaf Support is comparable with the tests carried out by welders. Welders must complete these tests before starting work and in some cases may be expected to demonstrate their competence by carrying out a test weld.
Flange competency testing is carried out in close cooperation with exclusive partner Progresso Group.

See also the other flange management services

Training Consultancy


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Do you have any questions about Flange management?

Contact Peter Dijkgraaf:

+31 (0) 6 51 38 59 67