Rupture, disk Manufacturing range

Besides the rupture disk manufacturer s pressure range for the rupture disks it made, it also has tolerance for the upper and lower pressure limit. API 520 (Figure 26, note 3, p. 39) mentioned this tolerance is 5% for rupture disk set pressure above 40 psi, or 2 psi for rupture di set pressure below 40 psi,... 

The manufacturing range is defined as the allowable pressure range within which a rupture disk is rated. It is based upon the customer specified burst pressure. The manufacturing ranges for Continental s standard rupture disk are outlined in Table 7-2. 

It is essential to select the type or style of rupture disk before making the final determination of the final burst pressure, and even this selection must recognize the pressure relationships betw een the disk s manufacturing range and the vessel s maximum allowable w orking pressure. (Also see Eigures 7-31A and 31B.)... 

Table 7-9 summarizes the usual recommended relationship between the operating pressure of a process (should be maximum expected upper range level) and the set pressure of the rupture disk. Recognize that the set pressure of the disk must not exceed the MAWP of the vessel. (See Eigures 7-31A and 31B.) The burst pressure, P, can now be defined. The use of the manufacturing range... 

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. 

Units depend on consistency with other symbols in equation, or manufacturing range for metal bursting/rupture disks, mj = spark energy, milli-joules inTyr = mass of TNT, lb... 

Runaway reactions, 405 Runaway reactions, DIERS, 521-523 Rupture, disk, 401, 418, 435, 455 Burst pressure, 456 Calculations, non-explosive, 455, 459 Code pressure levels, 410 Effects of temperature, 458 Graphite, 418-420, 424 Installation, 422, 423 Liquids, 462 Low pressure, 418, 421 Manufacturing range, 434, 456 Metal, 411 Non-fire, 465 Quick opening, 414, 415 Reverse buckling, 413 Selection features, 434... 

---