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By tctuvan
#864506 Tải miễn phí ebook Tiêu chuẩn ISA 5.1-2009, chuyên đề về các ký hiệu dùng trong bản vẽ P& ID và PFD, rất bổ ích cho các bạn dân I& C và Kỹ thuật

Preface (informative)
This preface is included for information purposes and is not part of ANSI/ISA-5.1-2009.
This standard has been prepared as part of the service of ISA, The International Society of Automation,
toward the goal of uniformity in the field of industrial automation. To be of continuing value, this standard
should not be static but should be subject to periodic review. ISA welcomes all comments and
suggestions and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67
Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone: (919) 549-8411; Fax:
(919) 549-8288, e-mail: [email protected].
The ISA Standards and Practices Department is aware of the growing need for attention to the metric
system of units in general, and the International System of Units (SI) in particular, in the preparation of
instrumentation standards. The Department will endeavor to introduce SI-acceptable metric units in all
new and revised standards, recommended practices, and technical reports to the greatest extent
possible. Standard for Use of the International System of Units (SI): The Modern Metric System,
published by the American Society for Testing & Materials as IEEE/ASTM SI 10-97, and future revisions,
will be the reference guide for definitions, symbols, abbreviations, and conversion factors.
It is the policy of ISA to encourage and welcome the participation of all concerned individuals and
interests in the development of ISA standards, recommended practices, and technical reports.
Participation in the ISA standards-making process by an individual in no way constitutes endorsement by
the employer of that individual, of ISA, or of any of the standards, recommended practices, and technical
reports that ISA develops.
CAUTION — ISA ADHERES TO THE POLICY OF THE AMERICAN NATIONAL STANDARDS
INSTITUTE WITH REGARD TO PATENTS. IF ISA IS INFORMED OF AN EXISTING PATENT THAT IS
REQUIRED FOR USE OF THIS STANDARD, IT WILL REQUIRE THE OWNER OF THE PATENT TO
GRANT EITHER A ROYALTY-FREE LICENSE FOR USE OF THE PATENT BY USERS COMPLYING
WITH THIS STANDARD OR A LICENSE ON REASONABLE TERMS AND CONDITIONS THAT ARE
FREE FROM UNFAIR DISCRIMINATION.
EVEN IF ISA IS UNAWARE OF ANY PATENT COVERING THIS STANDARD, THE USER IS
CAUTIONED THAT IMPLEMENTATION OF THIS STANDARD MAY REQUIRE USE OF TECHNIQUES,
PROCESSES, OR MATERIALS COVERED BY PATENT RIGHTS. ISA TAKES NO POSITION ON THE
EXISTENCE OR VALIDITY OF ANY PATENT RIGHTS THAT MAY BE INVOLVED IN IMPLEMENTING
THIS STANDARD. ISA IS NOT RESPONSIBLE FOR IDENTIFYING ALL PATENTS THAT MAY
REQUIRE A LICENSE BEFORE IMPLEMENTATION OF THIS STANDARD OR FOR INVESTIGATING
THE VALIDITY OR SCOPE OF ANY PATENTS BROUGHT TO ITS ATTENTION. THE USER SHOULD
CAREFULLY INVESTIGATE RELEVANT PATENTS BEFORE USING THIS STANDARD FOR THE
USER’S INTENDED APPLICATION.
HOWEVER, ISA ASKS THAT ANYONE REVIEWING THIS STANDARD WHO IS AWARE OF ANY
PATENTS THAT MAY IMPACT IMPLEMENTATION OF THIS STANDARD NOTIFY THE ISA
STANDARDS AND PRACTICES DEPARTMENT OF THE PATENT AND ITS OWNER.
ADDITIONALLY, THE USE OF THIS STANDARD MAY INVOLVE HAZARDOUS MATERIALS,
OPERATIONS, OR EQUIPMENT. THIS STANDARD CANNOT ANTICIPATE ALL POSSIBLE
APPLICATIONS OR ADDRESS ALL POSSIBLE SAFETY ISSUES ASSOCIATED WITH USE IN
HAZARDOUS CONDITIONS. THE USER OF THIS STANDARD MUST EXERCISE SOUND
PROFESSIONAL JUDGMENT CONCERNING ITS USE AND APPLICABILITY UNDER THE USER’S
PARTICULAR CIRCUMSTANCES. THE USER MUST ALSO CONSIDER THE APPLICABILITY OF
ANY GOVERNMENTAL REGULATORY LIMITATIONS AND ESTABLISHED SAFETY AND HEALTH
PRACTICES BEFORE IMPLEMENTING THIS STANDARD.


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