As part of an olefin plant design, naturally the distillation train operates at cryogenic temperatures resulting in a cold box of multistream HXs and flash drums and 4 refrigerant cycles necessary to provide the cooling duties for the condensers in the columns.
The main hazards I've identified are
1. Cryogenic temperatures - low temps cause frostbite and burns etc. - Solution adequate PPE
2. flammability of olefins and refrigerants if they leak - insulate or jacketed vessells, regular pipe inspections, gas detectors? not sure what other safety features I could design or recommend to be implemented to reduce risk of setting alight?
3. Overpressurisation of vessells specifically in condensers and heat exchangers where phase change is occuring- install pressure relief valves to prevent build up of pressure
4. Cooling water freezing and blocking pipes - insulated the pipes to prevent the CW from freezing?
Are there any other hazards, if you would rank the hazards in order of most signficant based on both severity and likelihood what would you do?
My current thoughts are
1. flammability and fire due to leak in pipes - feel this is the most dangerous and likely scenario - what safety barriers can I install?
2. overpressurization - Other than relief valves and pressure gauges and their control loops, what else could I recommend to install?
3. cryogenic temperatures causing col dburns - just easy to