Hi All,
I came across ethyl benzene column system with operating pressure is 1.7 kg/cm2g, design pressure is 3.7 kg/cm2g @ 250 deg C & PSV set at 3.7 kg/cm2g. However, the column MAWP is 10.32 kg/cm2g @ 250 deg C. Reboiler MAWP is 7.5 kg/cm2g @ 250 deg C. All other associated equipment has MAWP same as column MAWP.
Overfilling is a credible overpressure scenario on this system as upstream pressure is 7 kg/cm2g. Is this a reason why equipment's has MAWP 3X of design pressure.
Please guide me on above system understanding.
Best Regards,
ChetanP