Recently, I heard that there is a law/ OSHA/ ASME piece of regulation dictating that hydrogen should be transferred (suppose from a tank of hydrogen to another location) by using specially approved tubing. Is this true?
This is a complex topic, if you are responsible for designing/altering such a system, I would say you should consult an expert in hydrogen transport. You will need input on the appropriate materials for the pipe (e.g. MOC of pipe for hydrogen embrittlement) and the types of joints required at the minimum.
Starting reading regarding the MECHANICAL design of hydrogen piping (note the scope) - NFPA 50A: Standard for Gaseous Hydrogen Systems at Consumer Sites, 1999 Edition
On the PROCESS design for hydrogen usage, it would be the same as any other gas transport application, using the appropriate materials and developing the proper process parameters.
Assuming the question pertains to smaller quantities as may be used in a laboratory or specialized heat-treating : H can easily be handled with ordinary materials = carbon steel, copper and stainless steel. A major concern with H is that if there is any leakage it will rise and collect at the top of any enclosure. So design needs to include things like explosion proof/ gas tight light fixtures.
Well, I have used regular acrylic tubing for the gaseous state. However, if any spark contact may occur, use spark resistors, a bubbler, ect. If it is in liquid state I would assume that more would be required. My project this year used hydrogen as a fuel source produced through electrolysis that was run through solar energy. My hydrogen output was in a gaseous state for efficiency.