We have been observing bowings in Radiation coils of a Naphtha Cracker Furnace for ethylene production. What technological improvements in furnace design and coil orientation and coil support system might be available to minimise the bowings? What process and inspection monitoring is needed to minimise bowings in operation? What are the effect of side burners? Generally the Cracker furnaces are not provided with explosion doors? In such case how can box overpressurisation be prevented? Please share best practices in interlocks in Cracker furnace operation.