One of the truly multidisciplinary subject is piping engineering. It draws its knowledge base from chemical, mechanical, civil, electrical, metallurgical, instrumentation, control engineering, to name a few.
Piping is a study of conveying fluids through a system of pipes. The effective transportation of fluids is studied under piping engineering. A professional training and experience is required to learn the tools and techniques for designing the in-line components, known as fittings, valves, and other devices, typically sense and control the pressure, flow rate and temperature of the transmitted fluid, and usually are included in the field of Piping Engineering.
Traditionally chemical and mechanical engineers look out to be piping engineers. A experience of 10-12 years is required to be a successful piping engineer without any professional training in this area, this is the belief of companies in the sector of design/engineering. If one is professionally trained in piping engineering the experience requirements decreases exponentially.