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1、ICS 75.180.20 Ref. No. ISO 23251:2006/Cor.1:2007(E) ISO 2007 All rights reserved Published in Switzerland INTERNATIONAL STANDARD ISO 23251:2006(E) TECHNICAL CORRIGENDUM 1 Published 2007-08-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION Petroleum, petro
2、chemical and natural gas industries Pressure-relieving and depressuring systems TECHNICAL CORRIGENDUM 1 Industries du ptrole, de la ptrochimie et du gaz naturel Systmes de dpressurisation et de protection contre les surpressions RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to ISO 23251:2006 was
3、prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 6, Processing equipment and systems. Page 38, Figure 1: Replace Key item “Y” with the following: Y plate temperature, averaged over 2,3 m2
4、(24 ft2), expressed in degrees Celsius (degrees Fahrenheit) Page 42, 5.15.2.2.2: Replace the definitions for A, A, p1 below Equation (8) with the following: A is the effective discharge area of the valve, expressed in square inches; A is the exposed surface area of the vessel, expressed in square fe
5、et; p1 is the upstream relieving absolute pressure, expressed in psi; Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 09/03/2007 01:39:17 MDTNo reproduction or networking permitted wi
6、thout license from IHS -,-,- ISO 23251:2006/Cor.1:2007(E) 2 ISO 2007 All rights reserved Page 42, 5.15.2.2.2: Replace the definitions for Tw and T1 below Equation (9) with the following: Tw is the recommended maximum wall temperature of vessel material, expressed in R; T1 is the gas absolute tempera
7、ture, at the upstream relieving pressure, determined from Equation (11), expressed in R. Page 42: Delete footnote 2) at the bottom of page. Page 42, 5.15.2.2.2: Replace the definition for g below Equation (10) with the following: g is the gravitational constant, expressed in ft-lb/lbf-s2. Page 43, 5
8、.15.2.2.2: Replace the definitions for pn and Tn below Equation (11) with the following: pn is the normal operating gas absolute pressure, expressed in psi; Tn is the normal operating gas absolute temperature, expressed in R. Page 106, 7.3.1.3.4: Replace “perf” with “per“ in the definition of GCi. P
9、age 110, 7.3.1.3.4: Replace list item e) with the following: e) Calculate G, in kilograms per second per square metre (pounds per second per square foot); Page 117, 7.3.2.1.2: Replace Equations (38) and (39) with the following: In SI units: 83 2vlv 2 0,1310() () D C Re = (38) In USC units: 83 2vlv 2
10、 0,9510() () D C Re = (39) Page 136, 7.3.4.3.3: Replace first sentence with the following: The noise level at 100 ft from the point of discharge to the atmosphere can be calculated in USC units as follows: Copyright International Organization for Standardization Provided by IHS under license with IS
11、O Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 09/03/2007 01:39:17 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 23251:2006/Cor.1:2007(E) ISO 2007 All rights reserved 3 Page 145, Figure A.1: Replace Key items “Z2” and “Z3” with the following: Z
12、2 relative molecular mass Z3 latent heat of vaporization, expressed in kilojoules per kilogram Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 09/03/2007 01:39:17 MDTNo reproduction or networking permitted without license from IHS -,-,-