文档介绍：Date of Issue: October 2002
Affected Publication: API Standard 673, Centrifugal Fans for Petroleum, Chemical and
Gas Industry Services, Second Edition, January 2002.
ERRATA
Existing:
Page 36, Appendix A, Section & d
c. If the amplification factor is greater than and the critical response peak is
below the minimum operating speed, the required separation margin (a percentage of
minimum speed) is equal to the following:
6
SM = 100-84+-
AF-&
d. If the amplification factor is greater than and the critical response peak is
above the trip speed, the required separation (a percentage of the maximum continu-
ous speed) is equal to the following:
SM = 126--- 100
AF-~
Replace the formulae with
REMOVE THE SQUARE ROOT SIGN FROM THE 3 IN THE DENOMINATOR (under the
number 6)
For c:
6
SM 100-84+-
= AF-3
For d:
SM 126--- 100
= AF-3
Centrifugal Fans for Petroleum,
Chemical and Gas Industry
Services
API STANDARD 673
SECOND EDITION, JANUARY 2002
American
Petroleum
Institute
Helping You
Get The Job
Done Right?
Centrifugal Fans for Petroleum,
Chemical and Gas Industry
Services
Downstream Segment
API STANDARD 673
SECOND EDITION, JANUARY 2002
American
Petroleum
Institute
Helping You
Get The Job
Done Right.""
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