ltd as per scc , custom bid for services - lumpsum priceinclusive of gst for sor item sl no30 ie deputation of service engineer on per diem basis for 25 mandays for maintenance of fd id fans in all units of the refinery as per scc , custom bid for services - lumpsum price inclusive of gst for sor item sl no 40 ie overtime charges of service engineer for 150 manhours for work beyond 08 hours on normal working days ie monday to saturday and work during sundays and holidays as per..