Tuesday, May 17, 2016

First Reefer Vessel Refits to Comply with Mandatory Refrigerant Gas Laws

European Flagged Ships Banned from Using Out of Date R22
Shipping News Feature
UK – EUROPE – WORLDWIDE – British headquartered Oceanic Technical Solutions (OTS) has completed what it believes to be the first complete successful conversion of a reefer vessel to operate on refrigerant R407F. Under the entry in force of new F-Gas rules in January 2015 banning the entire use of R22 refrigerant on all European-flagged vessels, the traditional ozone depleting R22 and other Hydrochlorofluorocarbons (HCFCs) are now completely outlawed across Europe.

During a scheduled dry docking at a shipyard in Klaipeda, Lithuania, the 6,120 dwt vessel, the Scombrus a ship of the Norbulk fleet, had her onboard reefer refrigeration plant shut down and the entire charge of R22 recovered. Three refrigerant recovery units were used to transfer the gas to dedicated refrigerant recovery receivers. The ships system was then checked for leaks by the OTS team and new gaskets, seals and oil filters fitted and inspected before a fixed leak detection system was fitted, equipment which is now a mandatory requirement under the F-gas Regulation (EU) No 517/2014 for refrigerant plants of a certain size.

Sensors for the leak detector were mounted at valve stations in the machinery room and each of the four cargo holds. The refrigeration plant was then purged with nitrogen and oil systems were flushed with fresh Polyolester oil to remove the existing mineral oil content. After charging the system with R407F, the system was operated at full capacity for two whole days, with the Oceanic team monitoring pressure and temperature parameters before the vessel received her first cargo of frozen fish.

R407F is also seen as a suitable replacement for R404A and R507 and other refrigerants with a GWP above 2500 that will be affected by new F-Gas Regulation (EU) No 517/2014 due to enter into force in 2020. While it won’t be illegal to have systems that run on these gases, servicing them and topping them up with virgin refrigerant will be. Robert Chesters, Managing Director, Oceanic Technical Solutions, commented:

“The ban means that shipowners looking to operate under a European flag or indeed reflag their vessels in Europe must now convert their HVAC and refrigeration systems to run on next generation refrigerants, of which there are hundreds. Based on the type of direct expansion plant in operation aboard and the cooling capacity required, we recommended Norbulk use R407F as it closely matches the cooling capacity, oil carrying properties and operating parameters of R22.

“While the gas is not commonly used in the maritime industry, R407F has a global warming potential (GWP) of 1800, far lower than the legislative cut-off point of 2500. All replacements are blends made up of several different components but if a leak occurs in certain parts of the system fractionation can occur, affecting the performance and stability of the refrigerant. R407F is a blend of just three refrigerants – R32, R125 and R134a.

“While each refrigeration plant and the appropriate refrigerant should be evaluated on a case-by-case basis, the success of the Norbulk refrigerant conversion has shown that R407F is a viable and environmentally-friendly alternative to existing high GWP refrigerants.”

Based on the success of the conversion Oceanic Technical Solutions is now evaluating the refrigeration plant aboard other Norbulk vessels for conversion later this year. John Taylor, Fleet Manager, Norbulk, observed:

“Since the conversion, we have reduced further the impact our operations have on the environment, without affecting cargo cooling performance, R407F refrigerant has very similar attributes to R22 but without damaging the environment.

“With our commitment to operating ships in full compliance with all recognised international and national regulations, the success of the refrigerant retrofit has shown the industry that there is a commercially viable alternative that has a reduced impact on the environment other than the Ozone-depleting gases formerly used in marine refrigeration plants.

Photo: Oceanic’s Technical Director Dave Lloyd leak testing the refrigeration plant.