If back pressure is variable specify the minimum and

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Unformatted text preview: cify set pressure and unit of measure. 49. Specify the maximum blowdown as a percent of set pressure, if different than manufacturerÕs standard. 50. Specify the latent heat of vaporization and unit of measure. 51. Specify the operating temperature and unit of measure. 52. Specify the actual temperature at relieving conditions and unit of measure. 53. Specify the increase in pressure in the discharge header as a result of ßow. 54. Specify the amount of superimposed back pressure that normally exists on the valve outlet and unit of measure. If back pressure is variable, specify the minimum and maximum. 55. Specify the set pressure at which the valve is adjusted to open on the test stand. The cold differential test pressure includes corrections to the set pressure for the service conditions of back pressure or temperature or both. 56. Specify the overpressure allowed, as a percent of set pressure or as a unit of measure. 57. Specify the compressibility factor, if used. 58. Give the speciÞc heat ratio as kp = Cp/Cv. 59. Specify the calculated oriÞce area, in square in. 60. Specify the selected effective oriÞce area in square in. 61. Specify the letter designation of the selected oriÞce. 62. Fill in the name of the manufacturer, if desired. 63. Fill in the manufacturerÕs model or type numbers, if desired. 64. Fill in the manufacturerÕs oriÞce area (in square in.), if desired. 65. Fill in the manufacturerÕs coefÞcient of discharge, if desired. 66. --``,,,`,``,,`````,,,,,`,,,``-`-`,,`,,`,`,,`--- 34. ConÞrmation of oriÞce sizing calculations required from vendor. Copyright American Petroleum Institute Reproduced by IHS under license with API No reproduction or networking permitted without license from IHS Licensee=TECNA/5935100001 Not for Resale, 05/05/2005 09:50:16 MDT 40 API STANDARD 526 Page Requisition No. Job No. Date Revised PILOT-OPERATED PRESSURE RELIEF VALVE SPECIFICATION SHEET of By GENERAL 1. Item Number: 2. Tag Number: 3. Service, Line, or Equipment Number: 4. BASIS OF SELECTION 5. Num...
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This document was uploaded on 11/25/2013.

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