Example 7-3 Rupture Disk Selection

Examination of the temperature control ranges of a process reactor reveals that the normal controls are to maintain a pressure of the reacting mixture of 80 psig, while the upper extreme could be 105 psig, which would be defined as the normal maximum operating pressure. 

Select a conventional rupture disk, then from Table 7-9 p = n 7 p 

From manufacturing range table for this type of disk, MR = + 10/— 5% 150 psig rupture pressure minimum. The maximum rupture pressure = 150 + 10% = 165 psig, plus/minus the disk tolerance of 5%, allowing a final maximum burst pressure of 173.2 psig. 

The minimum stamped bursting pressure of the disk would be 150 psig + 5% tolerance = 157.5 psig. 

With a —5% MR, the specified burst pressure would be 157.5 + 5% = 165.4 psig. 

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