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Common Practices for Determining Relief Rates

The relieving pressure upstream of the reUef device is the set pressure plus allowable overpressure (9,293). The allowable overpressure is set by the applicable code (e.g., 11), and depends on whether the set pressure is equal to or is lower than the allowable working pressure of the column (9). Often, the relieving pressure is 10 to 20 percent higher than the set pressure a more detailed set of guidelines was presents by Mukeiji (293). [Pg.233]

The relieving temperature upstream of the relief device is usually [Pg.233]

The relief vapor rate depends on the cause of overpressure. Common practices for determining this rate for various failures are outlined below. Credits and some debits taken in the calculations are excluded from the guidelines below. These eire examined separately in Sec. 9.4. [Pg.234]

Loss of coolant. This failure frequently sets the column relief requirements. A common practice (9) is to set the required relief capacity equal to the total incoming steeim and vapor, plus that generated therein under normal operation. [Pg.234]

Loss of electric power. This is another failure that frequently sets the column relief requirements. A common practice (9) is to study the installation to determine the effect of power failures and to set the required relief capacity for the worst condition that can occur. All electrically driven equipment, such as pumps, compressors, and fans (including those in the site cooling water system or steam supply system), may fail, and so will electronic controllers and computer control equipment. [Pg.234]


See other pages where Common Practices for Determining Relief Rates is mentioned: [Pg.233]    [Pg.233]   


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