ASTM F1311-90(2023)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1311 − 90 (Reapproved 2023) An American National Standard
Standard Specification for
Large–Diameter Fabricated Carbon Steel Flanges
This standard is issued under the fixed designation F1311; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Code of Federal Regulations Title 46, Subpart 56.30—10
(b) (5)
1.1 This specification provides design and construction
ASME Boiler and Pressure Vessel Code, Section IX, Weld-
criteria for large diameter flanges sizes 14 NPS to 144 NPS, for
ing Qualifications
use in high temperature (1000 °F), low pressure service
(25 psig), such as internal combustion engine exhaust and
3. Classification
forced ventilation systems.
3.1 Type I—Plate flanges, for sizes 14 in. inside diameter up
1.2 The values stated in inch-pound units are to be regarded
to and including 144 in. inside diameter (see Fig. 1).
as standard. No other units of measurement are included in this
3.2 Type II—Rolled angle flanges, for sizes 14 in. up to and
standard.
including 108 in. inside diameter (see Fig. 1).
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Ordering Information
ization established in the Decision on Principles for the
4.1 Flanges ordered under this specification shall include
Development of International Standards, Guides and Recom-
the following:
mendations issued by the World Trade Organization Technical
4.1.1 ASTM designation, title, number, and date of this
Barriers to Trade (TBT) Committee.
specification,
4.1.2 Type and material,
2. Referenced Documents
4.1.3 Nominal pipe size,
2.1 ASTM Standards:
4.1.4 Quantity, and
A36/A36M Specification for Carbon Structural Steel
4.1.5 Inspection of items shall be agreed upon between the
F1155 Practice for Selection and Application of Piping
purchaser and the supplier.
System Materials
2.2 AWWA Standards:
5. Dimensions and Tolerances
AWWA C 207 Steel Pipe Flanges for Waterwork Service
5.1 Dimensions—Dimensions shall be in accordance with
4 in. through 144 in.
Table 1.
2.3 Other Documents:
5.2 Tolerances:
American Bureau of Shipping Rules for Building and
4 1
5.2.1 Plus or minus ⁄4 in. on outside and inside diameters
Classing of Steel Vessels, ABS Grade A
shall apply on flanges of 22 in. nominal pipe size and above.
American Welding Society Publication, AWS D 1.1 Struc-
The tolerance for flanges for 20 in. nominal size and below
tural Welding Code
shall be 6 ⁄8 in.
5.2.2 Plus or minus ⁄16 in. on bolting circle.
This specification is under the jurisdiction of ASTM Committee F25 on Ships
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
6. Drilling
Machinery and Piping Systems.
Current edition approved May 1, 2023. Published June 2023. Originally
6.1 Number of holes, hole diameter, and bolt circle are
approved in 1990. Last previous edition approved in 2018 as F1311 – 90 (2018).
identical for both Type I and Type II flanges.
DOI: 10.1520/F1311-90R23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 Bolt holes shall be equally spaced on the bolt circle.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.3 Bolt holes provide for ⁄8 in. diameter clearance on bolts.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Available from American Water Works Association (AWWA), 6666 W. Quincy
Ave., Denver, CO 80235, http://www.awwa.org. Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
Available from American Bureau of Shipping (ABS), ABS Plaza, 16855 Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
Northchase Dr., Houston, TX 77060, http://www.eagle.org. Available from American Society of Mechanical Engineers (ASME), ASME
Available from American Welding Society (AWS), 8669 NW 36 St., #130, International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
Miami, FL 33166-6672, http://www.aws.org. www.asme.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1311 − 90 (2023)
7.2 Welding shall be in accordance with the American
Bureau of Shipping Rules for Building and Classing of Steel
Vessels, ABS Grade A, American Welding Society Publications
D 1.1, or ASME Code Section IX.
7.3 Flange faces shall be smooth and free of projections or
indentations that would prevent effective gasket seals.
7.4 Flanges when completed shall have no distortion,
roundness, or flatness exceeding a tolerance of 6 ⁄8 in.
7.5 The surface finish shall be a minimum of 500 μin. to
ensure proper sealing surface for the gasket.
7.6 The material to be used for this specification shall be in
accordance with Specification A36/A36M, unless prolonged
high temperatures will be required; in that case ABS Grade A
steel shall be specified in Section 4. For further guidance for
selection of materials, see Practice F1155 and CFR 56.30-
10(b)(5).
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