_API_RP_520_PART_1.PDF

Sizing,Selection,and Installation of Pressure-Relieving Devices in Refineries Part I-Sizing and Selection API RECOMMENDED PRACTICE 520 SEVENTH EDITION,JANUARY 2000 Environmental Partnership American Petroleum Institute Helping You Get The Job Done Right.Copyright by the American Petroleum Institute Thu May 11 15:56:43 2006 n Strategiesfor Todays Environmental Partnership API ENVIRONMENTAL,HEALTH AND SAFETY MISSION AND GUIDING PRINCIPLES The members of the American Petroleum Institute are dedicated to continuous efforts to improve the compatibility of our operations with the environment while economically developing energy resources and supplying high quality products and services to consum-ers.We recognize our responsibility to work with the public,the government,and others to develop and to use natural resources in an environmentally sound manner while protecting the health and safety of our employees and the public.To meet these responsibilities,API members pledge to manage our businesses according to the following principles using sound science to prioritize risks and to implement cost-effective management practices:To recognize and to respond to community concerns about our raw materials,prod-ucts and operations.To operate our plants and facilities,and to handle our raw materials and products in a manncr that protccts thc cnvironmcnt,and thc safcty and hcalth of our cmployccs and the public.To make safety,health and environmental considerations a priority in our planning,and our development of new products and processes.To advise promptly,appropriate officials,employees,customers and the public of information on significant industry-related safety,health and environmental hazards,and to recommend protective measures.To counsel customers,transporters and others in the safe use,transportation and dis-posal of our raw materials,products and waste materials.To economically develop and produce natural resources and to conserve those resources by using energy efficiently.To extend knowledge by conducting or supporting research on the safety,health and environmental effects of our ranT materials,products,processes and waste materials.To commit to reduce overall emissions and waste generation.To work with others to resolve problems created by handling and disposal of hazard-ous substances from our operations.To participate with government and others in creating responsible laws,regulations and standards to safeguard the community,workplace and environment.To promote these principles and practices by sharing experiences and offering assis-tance to others who produce,handle,use,transport or dispose of similar ranT materi-als,petroleum products and wastes.Copyright by the American Petroleum Institute Thu May 11 15:57:00 2006 Sizing,Selection,and Installation of Pressure-Relieving Devices in Refineries Part I-Sizing and Selection Downstream Segment API RECOMMENDED PRACTICE 520 SEVENTH EDITION,JANUARY 2000 American Petroleum Institute Helping You Get The Job Done Right.Copyright by the American Petroleum Institute Thu May 11 15:57:00 2006 SPECIAL NOTES API publications necessarily address problems of a general nature.With respect to partic-ular circumstances,local,state,and federal laws and regulations should be reviewed.API is not undertaking to meet the duties of employers,manufacturers,or suppliers to warn and properly train and equip their employees,and others exposed,concerning health and safety risks and precautions,nor undertaking their obligations under local,state,or fed-eral laws.Information concerning safety and health risks and proper precautions with respect to par-ticular materials and conditions should be obtained from the employer,the manufacturer or supplier of that material,or the material safety data sheet.Nothing conlairled in any API publication is to be conslrued as granting any right,by implication or otherwise,for the manufacture,sale,or use of any method,apparatus,or prod-uct covered by letters patent.Neither should anything contained in the publication be con-strued as insuring anyone against liability for infringement of letters patent.Generally,API standards are reviewed and revised,reaffirmed,or withdrawn at least every fivc ycars.Somctimcs a onc-timc cxtcnsion of up to two ycars will bc addcd to this rcvicw cycle.This publication will no longer be in effect five years after its publication date as an operative API standard or,where an extension has been granted,upon republication.Status of the publication can be ascertained from the API Downstream Segment telephone(202)682-8000.A catalog of API publications and materials is published annually and updated quarterly by API,1220 L Street,N.W.,Washington,D.C.20005.This document was produced under API standardization procedures that ensure appropri-ate notification and participation in the developmental process and is designated as an API standard.Questions concerning the interpretation of the content of this standard or com-ments and questi