Explanation

Byco is the single largest oil refinery in Pakistan.

Byco has an installed capacity to process 155,000 barrels per day of crude oil 

Mouza Kund, District Lasbela, Hub Balochistan is a Byco refinery in Pakistan

while

Pak-Arab Oil Refinery is Pakistan's second-largest refinery

Reliance Jamnagar Refinery, India refinery is the world’s largest oil refinery.