Another related question. If we do not have utilities (steam, electric, instrument air), but we have FLO (Flushing oil) from a off site pump. Can we use FLO to inject in the heaters after the shutdown ? Are there any problem related with flange leaking, heater coking and so on ? We have in our heaters a smal pipe (1 1/2 in) that inject FLO in the furnace header. We can inject in each heater pass because I think the flowrate is not enough for the overall heater pass, or is better to inject in all pass equaly. The FLO temperature is +/- 30 Celsius.