Lanzhou Petrochemical has taken off-stream its No. 4 cracker for a maintenance turnaround, in the last week of April 2019. The cracker is likely to remain under maintenance for around 7 weeks. The No. 4 cracker has an ethylene production capacity of 460 kta and a propylene production capacity of 230 kta that is located in Lanzhou, Gansu province of China.