LNG carrier
An analysis of several spherical carriers showed that the vessels can withstand a 90-degree side-on collision with another similar LNG carrier at 6.6 kn (50% of normal port speed) with no loss of LNG cargo integrity. This drops to 1.7 kn for a fully loaded 300,000 dwt oil tanker collision into an LNG carrier. The report also notes that such collisions are rare, though are possible. (Pitblado, 2004)