JB/T 54401-1999 This standard is a revision of JB/T 54401-93 "Intermittent Sand Mixer Reliability Assessment and Assessment Method". During the revision, only editorial modifications were made in accordance with relevant regulations, and the main technical content has not changed. This standard specifies the intermittent sand mixer reliability indicators, fault classification and criteria, sampling requirements and prototype requirements, test plans, data collection and processing, certification procedures, etc. This standard is applicable to the reliability determination of roller sand mixers used in die-casting production. This standard was first published in 1993.