Oceanic Technical Solutions

May 17, 2016 - Oceanic Technical Solutions has successfully converted all refrigeration and reefer plants onboard a Norbulk managed refrigerated cargo ship to run on refrigerant R407F. The conversion, which follows the January 2015 entry into force of F-Gas rules banning the entire use of R22 refrigerant on all European-flagged vessels, is believed to be the shipping industry’s first ever marine refrigerant conversion to the more environmentally-acceptable R407F. Prior to January 2015, operators were still able to purchase recycled R22, but the ozone-depleting gas and other Hydrochlorofluorocarbons (HCFCs) are now completely outlawed across Europe. John Taylor, Fleet Manager, Norbulk, said: “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 gasses formerly used in marine refrigeration plants. “Since the conversion, we have reduced further the impact our operations have on the environment, without affecting cargo cooling performance - confirmed Taylor - R407F refrigerant has very similar attributes to R22 but without damaging the environment.” During a scheduled drydocking at a shiprepair yard in Klaipeda, Lithuania, the 6120dwt reefer’s refrigeration plant aboard was shut down and the entire charge of R22 recovered. Three refrigerant recovery units were used to transfer the gas to dedicated refrigerant recovery receivers. However, before the plant could be charged with the new gas, Oceanic’s conversion team, led by Technical Director Dave Lloyd, pressure tested the plant for leaks, fitted new gaskets, seals and oil filters, inspected and made leak-tight all pipe work and installed a fixed leak detection system – now a mandatory requirement under the F-gas Regulation (EU) No 517/2014 for refrigerant plants of a certain size – with sensors 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 days, with the Oceanic team monitoring pressure and temperature parameters before the vessel received her first cargo of frozen fish. Robert Chesters, Managing Director, Oceanic Technical Solutions, said: “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.