Equipment design temperature and temperature under special conditions
Thread Content
A hazard and operability study was conducted on a storage tank. The design temperature of the equipment was set at 30 degrees higher than the temperature under normal operating conditions. However, during the analysis, experts suggested that if the cooling water in the cooler feeding the upstream process fails, the temperature of the material entering the storage tank could become too high, exceeding the design temperature. Therefore, the design temperature should be increased to reflect the temperature of the material when there is no cooling water in the upstream heat exchanger. Regarding this issue, are these extreme conditions taken into account when specifying the design temperature? Is the design pressure also taken into consideration?
Yes, this is the concept of intrinsically safe design, which should be implemented.
While this makes things safer, it leads to waste; it’s better to focus on improving system reliability.
HAZOP considers the worst-case operating conditions