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STD.PFI ES-3-ENGL 2000 7Lb4544 00005LL bT8 D
PFI Standard ES-3
(Reaffimied September 2000)
FABRICATING TOLERANCES
Prepared by
Pipe Fabrication Institute Engineering Committee
All PFI Standards are advisory only. There is no
agreement to adhere to any PFI Standard and their
use by anyone is entirely voluntary.
Copyright by
PIPE FABRICATION INSTITUTE
Dedirnted io Teclinicnl Adiwnceinenis nnd Stondnrdizntion in
rlie Pipe Fnbricniioii lridiisii.).
Since i913
USA CANADA
PMB 323
Woshinglon. DC 20003
655. 32"" ove. sirite 201
H8T3G6
61 I Pennsjhmia Averiire SE Lnrkine. Qirebec
WEB SITE
/zttp://iMi?ii.pfi-insfi/i~te. org
COPYRIGHT Pipe Fabrication Institute
Licensed by Information Handling Services
COPYRIGHT Pipe Fabrication Institute
Licensed by Information Handling Services
PFI Standard ES-3
(Reaffirmed September 2000)
FABRICATING TOLERANCES
METRIC CONVERSIONS
The conversion of quantities between systems of units involves a determination of the number of
significant digits to be retained. All conversions depend upon the intended precision of the original
quantity and are rounded to the appropriate accuracy.
Pipe sizes together with applicable wall thickness are not shown with metric equivalents.
The SI (metric) values where included with the customary U.S. values in this Standard are the
rounded equivalents of the U.S. values and are for reference only.
Metric units were derived utilizing the following conversion factor:
Conversion Factor
inches to 25.4
millimeter
1. Scope
1.1 This standard covers general pipe shop
fabricating tolerances for prefabricated
piping assemblies.
2. Linear Tolerances
2.1 The tolerances on linear dimensions
(intermediate or overall) apply to the face to
face, face to end, and end to end
measurements of fabricated straight pipe and
headers; center'to end or center to face of
nozzles or other attachments; or center to
face of bends; as illustrated on Fig. 1. These
tolerances are not accumulative.
excess of those specified in paragraphs 2.2
and 2.3 may occur.
3. Angularity and Rotation Tolerances
3.1 Angularity tolerance across the face of
flanges, weld end preparation and on
rotation of flanges are as stated on Fig. 1.
4. Closer Tolerances
4.1 When closer tolerances than those given in
paragraphs 2.2, 2.3 and 2.4 are absolutely
necessary, they shall be subject to agreement
between the Purchaser and Fabricator.
2.2 Linear tolerances on "A" are k 1/8" (3.0
mm) for sizes 10" and under, k 3/16" (5.0
mm) for sizes 12" through 24" and I 1/4"
(6.0 mm) for sizes over 24" through 36".
2.3 Linear tolerances on "A" for sizes over 36"
are subject to tolerances o f f 1/4" (6.0 mm),
increasing by plus or minus 1/16" (2.0 mm)
for each 12" in diameter over 36".
2.4 Due to the cumulative effects of tolerances
on fittings or flanges, when joined without
intervening pipe segments, deviations in
2
COPYRIGHT Pipe Fabrication Institute
Licensed by Information Handling Services
COPYRIGHT Pipe Fabrication Institute
Licensed by Information Handling Services
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S T D - P F I ES-1-ENGL 2000 71b4544 0000513 470
4 "A" b
FOR BENDING TOLERANCE, MINIMUM
RADIUS AND MINIMUM TANGENT SEE
PFI STANDARD ES-24
TOLERANCES ON DIMENSIONS WHICH Do
NOT INCLUDE PIPE SEGMENTS ARE TO
BE BASED ON ANSI SPECIFICATIONS FOR
FITTINGS OR FLANGES INVOLVED
(SEE PARAGRAPH 2.4)
ROTATION OF FLANGES
FROM THE INDICATED
POSITION MEASURED AS
SHOWN, 1/16' (2.0 mrn) MAX
APPLICATION OF PIPE FABRICATION TOLERANCES
3
I SECTION X-X
L ALIGNMENT OF FACINGS OR
ENDS SHALL NOT DEVIATE
FROM THE INDICATED
POSITION MEASURED ACROSS
ANY DIAMETER MORE THAN
3/64" PER FOOT (1.0 mm PER
25.0 cm) OR 1/32" (1 .O mm)
WHICHEVER IS GREATER
L
(3.0 mm)
COPYRIGHT Pipe Fabrication Institute
Licensed by Information Handling Services
COPYRIGHT Pipe Fabrication Institute
Licensed by Information Handling Services
~
STD-PFI ES-3-ENGL 2000 = 7Lb4544 OOOCI5L ' i 307
CHARTER MEMBERS
ACCORD PIPE FABRICATORS, INC.
AIR CONDITIONING COMPANY, INC.
FLO-RITE, INC.
GEM INDUSTRIAL, INC.
HPI CONSTRUCTION CO., INC.
HUXTABLE & ASSOCIATES, INC.
IDEAL WELDERS, LTD.
INDUSTRIAL POWER SYSTEMS, INC.
IVOR J. LEE, INC.
JOHN E. GREEN COMPANY
J. F. AHERN CO.
J. H. KELLY LLC
J. S. MC KINNEY, INC.
KINETIC SYSTEMS, INC.
M & M WELDING AND FABRICATORS, INC.
MC ABEE CONSTRUCTION, INC.
MC CARL'S, INC.
MECHANICAL INCORPORATED
MID STATES PIPE FABRICATING, INC.
MURPHY COMPANY
NARDE1 FABRICATORS, LTD.
NEWMECH COMPANIES, INC.
PHILLIPS, GETSCHOW COMPANY
PIPING SYSTEMS, INC.
S. A. COMUNALE COMPANY, INC.
S&D I OSTERFELD MECHANICAL CONTRACTORS
SCOTT CO. OF CALIFORNIA
SPECIALTY PIPING CORPORATION
TEAM INDUSTRIES, INC.
W. J. O'NEIL COMPANY
Jamaica,
Glendale,
Riviera Beach,
Wal bridge,
Huntington,
Lawrence,
Delta,
Toledo,
Masury,
Highland Park,
Fond du Lac,
Longview,
Freeport,
Santa Clara,
Gaithersburg,
Tuscaloosa,
Beaver Falls,
Freeport,
EI Dorado,
St. Louis,
Calgary,
St. Paul,
Oconto Falls,
New London,
Barberton,
Dayton,
San Leandro,
Davisville,
Kau kauna,
Livon ia,
New York
California
Florida
Ohio
West Virginia
Kansas
British Columbia (Canada)
Ohio
Ohio
Michigan
Wisconsin
Washington
Texas
California
Maryland
Alabama
Pennsylvania
Illinois
Arkansas
Missouri
Alberta (Canada)
Minnesota
Wisconsin
Wisconsin
Ohio
Ohio
California
West Virginia
Wisconsin
Michigan
A current index of the latest revised ES Standards, Technical Bulletins and Safety Training Guideline is available from
the Pipe Fabrication Institute.
PFI Safety Training Guideline, Standards and Technical Bulletins are published to serve proven needs of the pipe
fabricating industry at the design level and in actual shop operations. Hence, such needs are continually considered and
reviewed by the Engineering Committee of the Pipe Fabrication Institute to provide recommended procedures, which
have been demonstrated by collective experiences to fiilfill requirements in a manner for Code compliance. However,
as the PFI Standards are for minimum requirements the designer or fabricator always has the option of specifying
supplementary conditions in the form of requirements beyond the scope of the PFI publications.
COPYRIGHT Pipe Fabrication Institute
Licensed by Information Handling Services
COPYRIGHT Pipe Fabrication Institute
Licensed by Information Handling Services
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