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Effective and Economic solutions to maintain rigs and vessels during hot and cold storage

15 Sep 2016 | by Aggreko | Category: Shipping
Power solutions for the shipping industry - South Atlantic Brasil 2006

The questions “how to stack idle expensive offshore assets” and “how to reduce rig or vessel operating costs” are on the mind of many companies in the Oil sector.

There are 2 ways to stack vessels and rigs, Hot stacking and Cold stacking. Aggreko’s specialist power, heating, and drying solutions enable cost-effective preservation of important assets during both hot or cold stacking.

Hot Stacking – Why rent Power  generators?

A Hot-stacked rig typically retains most of its crew and can deploy quickly if an operator requires its services. In a hot stacked state, normal maintenance operations similar to those performed when the rig is active are continued by a crew so that the rig remains work ready. Additionally, some machinery needs to run idle and/or under minimum load. In this case, Aggreko’s portable diesel generators offer a cost-effective solution to onboard power with our generators replacing the need to operate the main engines and emergency generators, we can reduce maintenance requirements and operating costs. Our Diesel Generators (30 kVA – 2100 kVA) can be quickly stepped up or down, depending on demand, to provide power for regular onboard maintenance operations, staff welfare facilities and the recommissioning process. With our generators replacing the need to operate the main engines and emergency generators, we can reduce maintenance requirements and operating costs.

Cold Stacking – We can ensure a rig or vessel’s equipment is kept in optimum condition

Cold-stacking of a rig involves “storing” the rig in a harbour, shipyard or designated area offshore while the crew is reduced to either zero or just a few key individuals. Typically, steps are taken to protect the rig including installing dehumidifiers and applying protective coatings to fight corrosion. Dehumidification units and associated distribution trunking can be installed to achieve sufficient air circulation, both in ‘controlled’ spaces and throughout major machinery, equipment and systems and Aggreko’s environmental control solutions could help prevent deterioration of the structure and onboard machinery, and reduce the timescales and costs of reactivation. Utilising temporary power generators and specialist heating and drying solutions, we ensure a rig or vessel’s equipment is kept in optimum condition.

Power solutions for the shipping industry - South Atlantic Brasil 2006

Key advantages using Aggreko’s solutions

  • Global reach – consistent capabilities worldwide with bespoke solutions to match local requirements.
  • Turnkey service – from design to installation, service, maintenance and fuel management.
  • Cost-effective solutions – detailed on-site scoping study determines most efficient solution from our extensive product range, allows total budget certainty and minimum hassle
  • Specialist team – dedicated application specialists, process, mechanical, electrical and chemical engineers.
  • Experts in our field – we focus solely on power and temperature control solutions. This gives us the technical expertise, equipment, skills and experience on a scale, and to a depth, that no one else can rival.

Our service

Aggreko’s team of power and temperature control experts will perform an on-site scoping survey of each individual rig or vessel in order to the understanding of the project’s requirements and allows us to provide a detailed recommendation based on its specific needs.

Once a solution is agreed, our certified technicians will install and commission the equipment, following strict safety regulations for both off-shore and port requirements.

Our service is fully inclusive of all ancillary equipment, spares, servicing and maintenance. We can also provide a reliable fuel management service, ensuring continuous equipment operation with minimal disruption.

Throughout the hire our specialist team is available to provide expertise in all aspects of the project – 24/7, 365 days a year.

Subsea 7

Key applications

Auxiliary and backup power    

  • Generators (30 KVA – 2100 kVA) at 50 Hz / 60 Hz to provide auxiliary power, onboard reserve power or emergency power for all rig and vessel requirements.
  • Temporary portside diesel generators to offer a ‘cleaner’ fuel alternative to onboard heavy fuel oil generators whilst in port.
  • Additional power for essential heavy lifting equipment.

Load testing

  • Resistive and reactive loadbanks to test a power supply system’s functionality during repair and mobilization.
  • Simulation of adverse environmental conditions (from sub-zero to hot desert) for equipment performance testing.
  • FPSO (Floating, Production, Storage and Offloading) vessel load testing to ensure generators are properly calibrated and installed.

Temperature Control

  • Controlled dehumidification of internal air spaces (including void spaces within machinery and pipelines) to prevent sweating and humidity corrosion damage, as well as moisture absorption into electrical cables and fittings.
  • Maintaining stable temperatures in key areas to avoid condensation and prevent freezing.
  • Upscaling of equipment to various parts of the rig or vessel during seasonal ambient temperature changes.
  • Temperature control equipment to maintain a ship’s HVAC system in dry docks.
  • Chilled water for a vessel’s operating systems whilst in port.

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