Zhenghe Petrochemical asked construction units to do detection checks on the anti-corrosion DCC, recently, and a liquefied petroleum gas spherical tank and finished product storage tanks that were last checked a year ago. The company established a quality construction acceptance check to ensure anti-corrosion levels. The system calls for a contractor to repair any places that do not qualify, for free. The company’s equipment anti-corrosion quality has improved significantly since the check system went into operation in 2012.