On December 25, 2018, our technical staff went to ningxia petrochemical company of China national petroleum corporation (hereinafter referred to as "ningxia petrochemical") for equipment maintenance.

On the morning of 25th, John crane and our technical staff arrived at a joint workshop of ningxia petrochemical company. This time, the main task was to maintain the slurry pump in the workshop. The department of operation of ningxia petrochemical company, maintenance crew and related personnel in the workshop participated in the maintenance. This maintenance period of 7 days, the slurry pump for routine maintenance and repair.