ASME recently formed two committees which were given thetask of drafting a new Vessel Code and a new Piping Code for pressures ranging from approximately 70 Mpa (10,000 psi) up to 1,400 Mpa (200,000 psi). Pressure vessels and pipework operating in this pressure range are, in many cases, employed for batch-type operations or are subjected to pulsating pressures, for example in LDPE (low-density polyethylene) plants, in isostatic pressing processes, or in the production of synthetic crystals. For this reason, it is very important to design the pressure-bearing components so that they can safely tolerate the load cycles which are to be imposed on them.