The boiler as a kind of common special equipment, the quality, specification and mark of its raw materials should meet the requirements of the applicable material specification. According to the different requirements of various materials purchased, ZOZEN Boiler has established a strict acceptance system to ensure the raw materials in compliance with the material specification and to prevent the unqualified raw materials entering into the production processes. For the safe operation of the boiler, sectional materials will be strictly re-inspected to ensure the boiler pressure strength.