Hydrogen. High pressure. High temperature. This is requiring, no, screaming for at least 2¼ Cr steel.

As cars for example, do not perform well on heavy fuel oil, it is essential to produce lighter fuels, such as petrol or diesel, from petroleum. One of the methods applied by the oil industry is to break, or crack, the long carbon chains of petroleum using a process called 'hydro cracking'. High pressure hydrogen at high temperatures are used to create lighter fuels from basic compounds via a catalyst. Hydrogen molecules form a bond with the shortened carbon ends, increasing the hydrogen level in the fuels. More hydrogen means more combustion energy. An extra bonus is that hydrogen is the cleanest fuel there is.