Technical Presentations at the July 2015 Meeting

1.1   ‘The Findings from HSE's KP4 Programme on Ageing & Life Extension’, Andy Duncan, Intertek Production & Integrity Assurance

This presentation gives an overview of the findings of the HSE's Energy Division Offshore's 3 year KP4 programme on the management of ageing and life extension of offshore oil and gas production installations which was led by Andrew Duncan whilst he was a Specialist Inspector with the HSE. The presentation identifies what was working well and what needs to be improved to manage the consequences of ageing and life extension to ensure that health and safety criteria are met. The presentation also refers to incident frequencies and the key issue of obsolescence management. Work undertaken by the Norwegian offshore Regulatory Authorities is referred to, as are technical guidance documents developed by Oil & Gas UK and the Energy Institute. The presentation shows similarities between the ageing and life extension issues and management of offshore oil and gas installations to other potentially hazardous industries such as nuclear power and civil and military aviation.

[A pdf version of this presentation has kindly been provided and is available to members from the Secretariat].

1.2   ‘Subsea Friction Welding with ROVs or Divers for Cathodic Protection Retrofit Offshore’, Stuart Harvey & Dave Gibson, Proserv UK Ltd

Subsea welding can be done by ROVs, the technique is known as Friction Welding. It has multiple applications one of which is the attachment of galvanic anodes to offshore structures and subsea assets for anode retrofit. This technique works particularly well on large flat surfaces such as the hull of an FPSO or large tubular members such as monopoles on wind farms. With a number of offshore structures and subsea assets reaching or exceeding their 25 year design life and operators wanting to extended their life, this technique offers a technically sound and cost effective solution.

[A pdf version of this presentation has kindly been provided and is available to members from the Secretariat].

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4.1  ‘HISC of Super Duplex Stainless Steel in Offshore Application’, Xiaoxue An, Technip Umbilical Ltd

The presentation reviews mechanism of HISC under CP system. It introduces some failure cases in offshore oil & gas industry and design code DNV RP F112. Further, the presentation focuses on HISC mitigation and HISC assessment. The results of testing on the super duplex stainless steel small bore tube is presented.


4.2    ‘Marine Growth Prevention Systems’, Julianna Measures, Cathelco

A presentation on marine growth prevention systems (MGPS) was given to introduce the subject to marine corrosion specialists. Background information on biofouling was provided to set the scene. Biofouling was described in simple terms and an overview of the process of biofouling was presented. Effects and problems associated with biofouling were discussed - mechanical, environmental and economic. Factors which influence biofouling were listed, to understand how antifouling can be achieved.

Anti-fouling systems were described, defining anti-fouling (AF) coating systems as distinct from MGPS. The aims and objectives of a successful MGPS were presented, to demonstrate how these systems operate, and the range of requirements and factors considered in designing or choosing an appropriate MGPS. Areas treated by MGPS were illustrated – in particular seawater cooling systems and niche areas.

The wide range of solutions were discussed, including both chemical and physical methods. This focussed on copper dosing and electrochorination as two of the most widely recognised MGPS. Other solutions briefly covered were CuNi pipework, osmotic shock, chemical treatments, thermal shock, sponge ball cleaning, UV radiation, ultrasonic cavitation and low level laser.

Key international conventions and regulations were described to highlight the importance of a globally consistent approach to AF and MGPS, as well as the difficulties in balancing the effect of biocides against the effect of biofouling. Lastly future solutions were presented, with the greatest research interest focused on the fields of biotechnology, biomimetics and use of naturally inspired solutions.

The presentation was concluded with a call for collaboration and sharing of innovations and technologies between Cathelco and any interested parties.


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