By American Petroleum Institute
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Additional info for API RP 521 Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries - Part 1 Sizing and Selection
Figure 26—Rupture Disk Application Parameters Assuming No Superimposed Backpressure --``````,`,,,`,`,,,,,,```,````-`-`,,`,,`,`,,`--- Copyright American Petroleum Institute Provided by IHS under license with API No reproduction or networking permitted without license from IHS Licensee=US mvd from 2458000/5940240030 Not for Resale, 06/17/2009 13:02:56 MDT 40 API STANDARD 520, PART 1—SIZING AND SELECTION Zero manufacturing range Negative manufacturing range (see Note 1) Positive and negative manufacturing range (see Note 2) +16% +12% +8% +0% Specified burst pressure +0% +0% -0% -4% -5% Marked burst pressure is equal to specified burst pressure -6% -8% -10% Marked burst pressure is within manufacturing range NOTE 1.
3 The space between the rupture disk and the PRV shall have a free vent, pressure gauge, trycock, or suitable telltale indicator as required in UG-127 of the ASME Code. A non-vented space with a pressure gauge without alarms or other devices is not recommended as a suitable telltale indicator. Users are warned that a rupture disk will not burst in tolerance if backpressure builds up in a non-vented space between the disk and the PRV, which will occur should leakage develop in the rupture disk due to corrosion or other cause.
If vacuum or backpressure conditions are present, the disk can be furnished with a support to prevent reverse flexing. These disks have a random opening pattern and are considered fragmenting designs that are not suitable for installation upstream of a PRV. 2 Forward-acting Scored Rupture Disks The scored forward-acting rupture disk is a formed (domed) disk designed to burst along scored lines at a rated pressure applied to the concave side (see Figure 21). Some designs provide satisfactory service life when operating pressures are up to 85 % to 90 % of the marked burst pressure of the disk (85 % to 90 % operating ratio).
API RP 521 Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries - Part 1 Sizing and Selection by American Petroleum Institute