Refinery is a lot of moving parts, and that might be some combination of big catalytic units (hydrotreater, hydrocracker, catalytic reformer), main or vacuum fractionator, delayed coker, pumps that feed it all, furnaces that heat it all, and loss of storage probably is a factor too because all these intermediates have to be stored somewhere before shipping. Fractionators are big distinct towers visible from far away so if it was hit, maybe there would be video