老化变质 meaning in Chinese

aged deterioration

Since the gas pipeline of handan has operated for many years , a lot of problems have appeared such as corrosion damage , anticorrosive coating aging metamorphism and gas leakage
摘要邯郸市煤气管网经过20多年的运行已进入了事故多发期，出现了腐蚀漏气、防腐层老化变质等问题，因此必须对全市煤气管网进行全面的腐蚀情况普查和安全性分析。
It can remove water content , gas , impurity in oil as well as polar material in degraded oil , reduce acid number , medium loss number , remove free carbon and enhance withstand voltage and quality to guarantee operation of electric equipment
可作为电力变压器大修专用过滤设备，不但能高效去除油中的水分气体杂质，而且能快速除去老化变质油中的极性物质，降低油液酸值，介损值，除去游离碳，提高油的耐压强度和油的质量，确保电力设备正常运行。