This standard specifies the product classification, technical requirements, test methods, inspection rules, signs, labels, instruction manuals, packaging, transportation and storage of central drive thickeners. This standard applies to single-layer thickeners with central drive (hereinafter referred to as thickeners). This machine is mainly used for thickening and desliming of various slurry. This standard does not apply to thickeners that require heat insulation devices for thickeners.