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Sizing, Selection, and Installation
of Pressure-Relieving Devices in
Refineries
Part I—Sizing and Selection
API RECOMMENDED PRACTICE 520
SEVENTH EDITION, JANUARY 2000
COPYRIGHT American Petroleum InstituteCOPYRIGHT American Petroleum Institute
Licensed by Information Handling ServicesLicensed by Information Handling Services
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
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