Tests by Parat Halvorsen on oil spill response equipment (OSR) for offshore supply vessels reveal significant deficiencies with systems using hot water coils. Norway's Parat Halvorsen undertook a series of trials after a number of lower cost hot water coil alternatives came on the market the market. Any spilled oil is recovered by OSR-equipped vessels and stored in tanks until it can be delivered to recovery stations on land. The recovered oil has to be heated to maintain a sufficient viscosity for offloading. Parat Halvorsen offers a heating solution based on steam injection from a boiler onboard. It has supplied equipment to a significant number of OSVs delivered by yards including Havyard, STX Norway, Kleven and Ulstein.