RISK ASSESSMENT OF PIPELINE PROTECTION
|Publication Date:||1 September 2019|
Scope and application
This recommended practice focuses on providing a methodology for assessing the risks and required protection from dropped crane loads and ship impact to risers and pipeline systems within the safety zone of installations. Accidental scenarios with other relevant activities such as anchor handling, subsea operations and trawling are also discussed. Where applicable information exists, specific values or calculation procedures are recommended. If no such information is available, then a qualitative approach is given. The recommended practice is applicable for the following two scenarios:
a) control that implemented control and protection measures are acceptable
b) optimisation of planned protection.
All the generic frequencies presented in this recommended practice, e.g. the drop frequency, are based on operations of North Sea installations. These frequencies are not generally applicable for other parts of the world. However, the general methodology is applicable throughout the world. Acceptance of protection measures can be based on operator supplied risk acceptance criteria covering human safety, environment and economics, or the failure frequencies given in DNVGL-ST-F101.
With respect to pipelines, the risk methodology used in this recommended practice is applicable to pipelines within offshore petroleum field developments. It should be noted that this document does not include regular 3rd party risk evaluations as found in onshore developments.