Читать книгу Underwater Inspection and Repair for Offshore Structures - Gerhard Ersdal - Страница 28

The petroleum activities on the Norwegian continental shelf are regulated by the Petroleum Safety Authority, PSA (previously Norwegian Petroleum Directorate, NPD), in the Framework, Management, Facility and Activities Regulations (PSA 2019). Very generic requirements are given to structures in these regulations, mostly indicating the safety level that should be met (structures should be able to withstand all loads at an annual probability of 10^‐4). The Activities Regulation specifies that the use of structures shall be in accordance with requirements stipulated and any additional limitations identified. Further, the Activities Regulation states that the structures should be maintained so that they are capable of carrying out their required functions in all phases of their life. Maintenance as a term in the PSA regulations includes activities such as monitoring, inspection, testing and repair.

In the guidance to the PSA facility regulation (PSA 2019) reference is made to NORSOK standards N‐001 (Standard Norge 2012), N‐003 (Standard Norge 2017a) and N‐004 (Standard Norge 2013) for how to fulfil design requirements for structures. Further, the PSA regulation refers to NORSOK N‐005 (Standard Norge 2017b) for requirements to in‐service integrity management and NORSOK N‐006 (Standard Norge 2015) for assessment of existing structures.

NORSOK N‐001 (Standard Norge 2012) specifies general principles and guidelines for safety of structures. The standard is valid for all types of structures and covers the use of several types of materials such as steel, concrete and aluminium. NORSOK N‐001 (Standard Norge 2012) further refers to the following accompanying standards in the NORSOK N‐series of standards for specific topics:

 NORSOK N‐003 (Standard Norge 2017a) provides the principles and guidelines for calculating loads and load effects;

 NORSOK N‐004 (Standard Norge 2013) presents methods for the design and strength evaluations of steel structures;

 NORSOK N‐005 (Standard Norge 2019) presents requirements for integrity management and in‐service integrity management of structures during operation;

 NORSOK N‐006 (Standard Norge 2015) gives recommendations for assessing structures in operation, including recommendations for life extension.