This standard is a compendium of experience and recommendations which cannot fully reflect the state of the art in every case, but has been prepared to the best of our knowledge. Its purpose is to facilitate the work of the user by summarising the existing information regarding certain findings in the field with which it is concerned. The standard is an important tool for rationalisation and serves to enhance the cooperation between the involved parties and so improve performance. Its application, in whole or in part, must be agreed between operator and contractor. Any liability, including for the material accuracy of the information presented, is excluded. It is also the user’s personal responsibility to clarify any patent and other intellectual property rights. It is requested that experience gained from the use of this standard as well as points that may give rise to misleading interpretations, shortcomings in the presentation as well as suggestions for improvement promptly be communicated to the VGB Office for evaluation, as they can be cause for additions or amendments.