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ABOUT FLANGES
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Look to
as
"The Source."
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Revised:
01/14/2013
Provided
links give access to illustrations and/or additional information. To
return to this page use your browser back button.
Use this calculator to
determine
torque necessary to
achieve psi tension in the bolt.
(Click here to calculate torque to
achieve a % of bolt yield strength)
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Use the following Torque Calculator for
ASTM A193 B7 and ASTM A320
L7 bolting, as specified in
API
6A,
16A
and 17D for flanges,
and for B7M and
L7M bolting stressed to 40,000 psi.
TPI for 1"
and smaller are
UNC, 1-1/8" and larger are 8UN.
Some flanges can be over-tightened to the point that the ring groove or
the flange can be damaged. The following 4 API flanges should not be
made up beyond 40,000 psi bolt stress (tension),
due to potentially high flange stress. API also specifies 40,000 psi
stress for all sizes of flanges using B7M and L7M bolts.
Two coefficients of friction or
f
factors,
are recognized by API. A coefficient of friction of
0.13 approximates the friction with threads and nut bearing surfaces
being bare metal, or plated, and well-lubricated with thread compound tested in
accordance with API RP 5A3 / ISO 13678.
A coefficient of friction of 0.07
approximates the friction with threads and nut bearing surfaces coated with Fluoropolymer
material (Teflon, Xylan, SermaGard). |
Information above, and in other
parts of this Web Site, may help persons who really seek to know. If you
have a question, and you think WOODCO USA may have the capacity to answer
it, please use our
Contact Us link and give us a
chance to help.
WOODCO USA
provides Web Site Tools for identification, estimating, and reference only. Do
not use this information for manufacturing or inspection. Users of these tools
should not use them as a substitute for professional engineering advice.
Anyone making use of the information presented does so at his own risk and
assumes any and all liability resulting from such use.
FOR FURTHER INFORMATION, OR TO LEARN MORE ABOUT WOODCO
USA PRODUCTS AND SERVICES,
CONTACT:
WOODCO USA
P.O. Box 1261
Houston, Texas 77251-1261
Phone: 713-672-9491
USA and Canada: 1-800-496-6326
Fax: 713-672-8768
www.woodcousa.com
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