Third , base on practice of author , from the need of certification by the equipment manufacture of petrochemical industry on , analysis the certification fact of lpm , carry out four aspect of set up whole pressure vessel quality system management mode . they are set up documental quality system , optimize process control , unify quality record , and effect analysis 再次，结合本人的工作实践从石油化工装备制造业对资质等级的要求入手，分析辽化机械厂的持证情况，从建立文件化质量体系的框架、优化体系过程控制、统一质量记录(表卡)及效果分析四个方面进行实证分析，得出建立压力容器质量体系一体化管理模式。
