+ What is Cable Protection?

Cable Protection is a collective term used within both the oil & gas and offshore renewable industries as a means for protecting subsea cables and SURF (subsea umbilicals, risers and flowlines) products from external mechanical forces whether in dynamic and/or static environments. In its roughest form, the terminology ‘cable protection’ covers many solutions including cable burial, rock dumping, mattressing, split-pipe, buoyancy and bend restrictors.

+ Why is Cable Protection necessary?

Having exposed cables within a subsea environment is not good practice based on the rate of cable failures from either environmental conditions or accidental loads. Burrying cables is seen as the most effective means of protection for the majority of a subsea cable length, however it is common for these cables to transition out of burial and connect to an offshore asset and/or shore landing. These ‘exposed’ elements require protection, such as Tekmar's cable protection systems.

+ Why protect Cables & SURF Products?

Subsea cable and SURF products provide a vital connection between assets. If this vital connection is damaged in any way the environmental and financial impact can be unprecedented.

Cable Protection is understood to be the most appropriate way of de-risking potential failures.

+ Cable Protection within the O&G & Renewables markets?

The oil & gas industry has used cable protection & SURF protection for many years and consider cable protection as a critical interface to protect subsea assets, this is coupled with exceptional quality standards such as API, for which these products must comply with.

The TekLink Mechanical Latch CPS has been supplied on over 70no OWF projects and was developed based on 30years of oil & gas heritage. It comprises of a number of common oil & gas products including ‘Stiffeners’ for damping movement, ‘Bend Restrictors’ for offering lock-out protection and ‘Split-Pipe’ for ballast and stability. It is Tekmars belief an effective CPS requires all three of these technologies to offer effective subsea protection.

TekLink has been design to remain flexible and versatile whilst protecting the majority of the industries subsea cable solutions. The patented mechanical latch interface for both monopiles (j-tubeless) and j-tubes protects subsea cables from the ‘hang-off’ deck, through the asset, transition through the free-span, along the seabed and/or scour protection and into burial. The TekLink is designed not to clamp to the subsea cable thus requiring no maintenance over its life time, whilst also allowing easy cable replacement if required. Not clamping to the subsea cable allows easier offshore installation for 2nd end methodologies.

+ Why Interface into both J-tube less and J-tube assets?

Most offshore wind farms now utilise both monopiles (j-tube less) and j-tube (OSS Jacket) interfaces therefore the TekLink CPS has been designed to interface into both. Tekmar also supply ancillary products such as bellmouths to offer a engineering connection. In 2007 Tekmar worked with a lead-in OWF developer who wanted to remove the external j-tubes from their monopiles, this was a huge success and saved the client £millions in costs and this led to the introduction of the j-tube less monopole to the indsutry.

+ Does using a Cable Protection System slow down cable installation?

No. The most common way of install the TekLink CPS is in conjunction with the subsea cable installation therefore it should not add any additional time to critical path activities. The TekLink CPS is also designed for pre-installation, without the subsea cable, if this installation methodology is considered effective for the project.

+ Are Cable Protection System’s standard?

To date Tekmar have supplied products to over 70no OWF projects and everyone has been bespoke. The design and configuration of the CPS is influenced by many factors including environmental conditions, cable properties, interface details etc, therefore each project is considered unique. Each project undergos a comprehensive design & engineering analysis using complex computer simulations and for this Tekmar subcontract AgileTek. AgileTek are a leading subsea analysis organisation who have an DNV accredited methodology for analysis subsea cables within offshore environments.

+ What about areas such as VIV, Thermal Performance, Free hanging cable vibration?

Tekmar maintains a continuous development programme to integrate lessons learnt & feedback from all projects. Key research and development areas to date have included items such as VIV, fatigue analysis, thermal performance, to name only a few. 2015 saw Tekmar invest heavily in a 12month thermal test programme which included live scale testing of various environmental conditions to demonstrate there is no detrimental affect of installing a CPS around a subsea cable. This was completed in conjunction with a leading OWF developer, for further information on these incentives please contact Tekmar.

+ So why buy any Cable Protection?

History shows cables and SURF products are prone to failure unless a suitable method of protection is utilised. The cost of any failure can be horrendous versus the cost of a suitable cable protection system and industries such as O&G would never consider deploying assets without suitable protection. To discuss available options please contact Tekmar.