PPI (Propane Performance Industries) – a company from New Zealand – manufactures very interesting LPG tanks, which are characterized by original design and by being made of unconventional material.
Autogas has always been stored in heavy steel containers of cylindrical shape and it’s the shape that caused them to take up a lot of space in vehicles. Large dimensions of the housing did not translate into high capacity of cylindrical tanks, which also affected the driving range.
Tanks manufactured by PPI are a combination of several (2 to 8) cylindrical tanks. This technology is called FPT (Flat Propane Tank Technology). The cylinders interpenetrate, creating a common chamber strengthened by bulkheads. Some of them are linked to the tank’s jacket to reduce the number of welded joints.
Tanks manufactured by PPI are flat and use the space inside the housing much better than the cylindrical ones. PPI tank’s capacity is about 12% greater than that of a cylindrical tank (or a group of tanks) with similar dimensions.