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See Chinese contents: NB/T 47019.1-2011 NB/T 47019.1-2011: Purchase technical specification for boiler and heater exchanger tubes/pipes. Part 1: General Requirements
This part of NB/T 47019 specifies such purchase technical specifications as the tube size, shape, mass, technical requirements, inspection and test rules, quality certificates, and so on, AND defines the duties, rights and obligations of the relevant parties.
