This page is dedicated to inform on all types of (emissions) data of Heerema's fleet and company in general. This data could be also used to (roughly) interpret an emissions footprint for HMC projects. This data is taken from the Sustainability Report.  

History of Heerema Vessels, Diesel Electric Propulsion and Fuels

Heerema has been operating crane vessels since 1963. Electrification of Heerema construction vessels became the standard around 1975, when the original vessels’ engine rooms were replaced by new diesel-electric power plants fueled by Marine Gas Oil (MGO) or Marine Diesel Oil (MDO). 

These types of fuel (marine distillate fuels) are generally classified as 'DMX', 'DMA', 'DMB', and 'DMC'. DMX is a very clean fuel that can be stored for longer periods of time with little concern about its quality deteriorating over the long term. DMX fuel represents a very small amount of marine fuel that is used, and it is only used for special applications, such as life boat engines and emergency generators. DMA is also referred to as marine gas oil, or MGO, and is used when a cleaner or less polluting fuel is desired. DMB, often referred to as marine diesel oil, or MDO, is generally a blend of distillate fuel with residual fuel oil. DMB does not burn as cleanly as either DMX or DMA. The main difference between MGO and MDO is the sulfur content. DMC is the lowest quality grade of MDO.

Since many years Heerema exclusively orders MGO but it cannot be excluded that in the early years (also) MDO was used. With the advent of the Sleipnir in 2019, Liquefied Natural Gas (LNG) has become part of Heerema's fuel mix. Furthermore, Heerema is looking into the usage of Gas-to-Liquid (GTL) and Hydrated Vegetable Oils (HVO) as a cleaner alternative to MGO. GTL and HVO are both synthetic, paraffinic diesel fuels and show potential to greatly reduce emissions. 

Heerema Vessel Properties

Heerema owns the world’s largest Semi-submersible Crane Vessels (SSCVs), known as Sleipnir, Thialf, and Balder. These operate alongside Heavy Lift Vessel Aegir, a monohull vessel. All these vessels are using  dynamic Positioning (DP). Heerema’s tugs Bylgia and Kolga, together with our barges, complete the fleet as they perform an extensive array of offshore support functions.

Our specialized vessels are deployed around the world and are unique in their capacities for heavy lifting and motion behavior. They have large deck areas and have earned their reputations for superior workability and excellent station-keeping. The fleet can operate in shallow, deep, and ultra-deep waters and can deliver the best quality of work even in the harshest of environments.

We have the same passion for sustainability as we do in delivering the highest quality of work for clients. Whether we are building a new vessel like Sleipnir, or dismantling a retired vessel such as Hermod, we strive to create sustainable value. Our newest vessel, Sleipnir, is a state of the art demonstration that being bold and mighty should not come at the expense of the environment. We are proud to showcase the environmental measures that we undertook to deliver on our ambitions to reduce our footprint and emissions. Sleipnir can run on Liquefied Natural Gas (LNG), drastically reducing harmful emissions without sacrificing operational quality. Additionally, Sleipnir, like Thialf, Balder, and Aegir, also uses bio-degradable oil on subsea equipment, energy-efficient LED lighting, Low Sulfur Marine Gas Oil (MGO), Ship Energy Efficiency Management Plan (SEEMP), waste management, plastic reduction plans, ballast water management, energy management plans, and efficient sailing procedures. In the table below, you can learn more about the vast and continuously growing list of sustainable measures that we introduce on the fleet.

1. The average fuel consumption is a 3 yearly average, i.e. total fuel usage of the last 3 years divided by three years

2. Emissions are determined using emission factors as follows. In the case of LNG and MGO for example, 1 [mT] of LNG used produces 2.75 [mT] CO2 and 1 [mT] of MGO used produces 3.206 [mT] CO2. For CO2 and SOX, IMO is used for reference. The NOX factors are vessel specific. For more information, please contact our Sustainability Advisor.

Key Environmental Performance Indicators 2019