Rupture disk devices

Explosion rupture disk device A rupture disk deviee designed for use at high rates of pressure rise. 

Rupture disk device A non-reclosing pressure relief device actuated by inlet static pressure and designed to function by the bursting of a pressure containing disk. 

Maximum allowable accumulated pressure for Installation of a multiple rupture disk device (other than fire exposure)... 

Multiple rupture disk device Single rupture disk device... 

Maximum allowable burst pressure for supplemental (fire exposure) rupture disk device (see Note 6)... 

The pressure conditions shown are for rupture disk devices installed on a pressure vessel,... 

Figure 7-7B. Pressure level relationships for rupture disk devices. Reprinted by permission, Sizing, Seiection and instaiiation of Pressure Relieving Dewces in Refineries, Part 1 Sizing and Selection," API RP-520, 5th Ed., July 1990, American Petroleum Institute.

Note When rupture disk devices are used, it is recommended that the design pressure of the vessel be sufficiently above the intended operating pressure to provide sufficient margin between operating pressure and rupture disk bursting pressure to prevent premature failure of the rupture disk due to fatigue or creep. 

Application of rupture disk devices to liquid service should be carefully evaluated to assure that the design of the rupture disk device and the dynamic energy of tlie system on which it is installed will result in sufficient opening of the disk. 

The combination of the spring loaded safety or safety relief valve and the rupture disk device is ample in capacity to meet the requirements of UG-133 (a) and (b). 

The stamped capacity of a spring loaded safety or safety relief valve (nozzle type) when installed with a rupture disk device between the inlet of the valve and the vessel shall be multiplied by a factor of 0.80 of the rated relieving capacity of the valve alone, or alternatively, the capacity of such a combination shall be established in accordance with Par. 3 below ... 

The capacity of the combination of the rupture disk device and the spring loaded safety or safety relief v alve may be established in accordance with the appropriate paragraphs of UG-132, Certification of Capacity of Safety Relief Valves in Combination with Non-reclosing Pressure Relief Devices. 

The space between a rupture disk device and a safety or safety relief v alv e shall be provided with a pressure gauge, a try cock, free vent, or suitable telltale indicator. This arrangement permits detection of disk rupture or leakage. ... 

The opening pro dded through the rupture disk device after breakage is sufficient to permit a flow equal to the rated capacity of the attached safety or safety relief valve without exceeding the allowable overpressure. 

The minimum net flow area is the calculated net area after a complete burst of the disk with appropriate allowance for any structural members which may reduce the net flow through the rupture disk derdce. The net flow area for sizing purposes shall not exceed the nominal pipe size area of the rupture disk device. 

Use of a rupture disk device in combination wdth a safety or safety relief valve shall be carefully evaluated to ensure that the media being handled and the valve operational characteristics will result in pop action of the valve coincident wdth the bursting of the rupture disk. 

A rupture disk device may be installed on the outlet side30 of a spring loaded safety relief valve... 

This use of a rupture disk device in series with the safety or safety relief valve is permitted to minimize the loss by leakage through the valve of valuable or of noxious or otherwise hazardous materials and where a rupture disk alone or disk located on the inlet side of the valve is impracticable, or to prevent corrosive gases from a common discharge line from reaching the valve internals. 

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