ASTM D4024-22

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D4024 − 15 D4024 − 22
Standard Specification for
Machine Made “Fiberglass” (Glass-Fiber-Reinforced
Thermosetting Resin) Flanges
This standard is issued under the fixed designation D4024; 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*
1.1 This specification covers reinforced-thermosetting resin flanges other than contact-molded flanges. Included are requirements
for materials, workmanship, performance, and dimensions.
1.2 Flanges may be produced integrally with a pipe or fitting, may be produced with a socket for adhesive bonding to a pipe or
fitting, or may be of the type used in conjunction with either a metallic or nonmetallic backup ring.
1.3 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are given for information
only. In cases where materials, products, or equipment are available only in SI units, inch-pound units are omitted.
1.4 The following precautionary caveat pertains only to the test methods portion, Section 10, of this specification: This standard
does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory
limitations prior to use.
NOTE 1—Contact molded flanges are covered in Specification D5421 and referenced in Specification D5685.
NOTE 2—There is no known ISO equivalent to this standard.
1.5 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.
2. Referenced Documents
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D883 Terminology Relating to Plastics
D1599 Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings
D1600 Terminology for Abbreviated Terms Relating to Plastics
D5421 Specification for Contact Molded “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Flanges
D5685 Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pressure Pipe Fittings
This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic
Thermosetting Resin Piping Systems and Chemical Equipment.
Current edition approved May 1, 2015July 1, 2022. Published June 2015July 2022. Originally approved in 1981. Last previous edition approved in 20122015 as
D4024 – 12.D4024 – 15. DOI: 10.1520/D4024-15.10.1520/D4024-22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D4024 − 22
F412 Terminology Relating to Plastic Piping Systems
2.2 ANSI Standards:
B 16.1 Cast Iron Pipe Flanges and Flanged Fittings
B 16.5 Pipe Flanges and Flanged Fittings
3. Terminology
3.1 Definitions:
3.1.1 General—Definitions are in accordance with Terminology D883 or Terminology F412. Abbreviations are in accordance with
Terminology D1600, unless otherwise indicated. The abbreviation for reinforced-thermosetting-resin pipe is RTRP.
4. Classification
4.1 General—This specification covers machine-made reinforced-thermosetting-resin flanges defined by type (method of
manufacture), grade (generic type of resin), class (configuration of joining system), and pressure rating. Flanges complying with
this specification are also given numerical classifications relating to burst pressure, sealing test pressure, and bolt torque limit.
4.1.1 Types:
4.1.1.1 Type 1—Filament-wound flanges manufactured by winding continuous fibrous glass strand roving or roving tape, either
preimpregnated or impregnated during winding, into a onto flange cavitytooling under controlled tension.
4.1.1.2 Type 2—Compression-molded flanges made by applying external pressure and heat to a molding compound that is confined
within a closed mold.
4.1.1.3 Type 3—Resin-transfer-molded flanges manufactured by pumping a thermosetting resin into glass reinforcements that have
been cut to size and clamped between matched molds.
4.1.1.4 Type 4—Centrifugally-cast flanges are made by applying resin and reinforcement to the inside of a mold that is rotated and
heated, subsequently polymerizing the resin system.
4.1.2 Grades:
4.1.2.1 Grade 1—Epoxy resin.
4.1.2.2 Grade 2—Polyester resin.
4.1.2.3 Grade 3—Phenolic resin.
4.1.2.4 Grade 4—Vinylester resin.
4.1.2.5 Grade 7—Furan resin.
4.1.3 Classes:
4.1.3.1 Class 1—Integrally-molded flange manufactured directly on a pipe section, pipe stub, or fitting.
4.1.3.2 Class 2—Taper to taper adhesive joint flange manufactured with a tapered socket to be used in conjunction with a pipe
or fitting with a tapered spigot section and a suitable adhesive. This joining method provides an interference fit over the entire
length of the bond line.
4.1.3.3 Class 3—Straight-taper adhesive joint flange manufactured with a tapered socket to be used with a pipe or fitting with an
untapered spigot section and a suitable adhesive. This joining method provides an interference fit at the bottom of the socket.
4.1.3.4 Class 4—Straight adhesive joint flange manufactured with an untapered socket for use with a pipe or fitting with an
untapered spigot and a suitable adhesive. This joint provides a pipe stop and may have an interference fit at the bottom of the
socket.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
D4024 − 22
4.1.4 Pressure Rating—Pressure rating shall be categorized by a single letter designation. Pressure designations are shown in Table
1.
4.1.5 Burst pressure, sealing test pressure, and bolt torque limit shall be categorized by single capital letter designations as
indicated by the cell classification system of Table 2.
4.2 Designation Code—The flange designation code shall consist of the abbreviation RTR, followed by the type, grade, and class
in arabicArabic numerals, the pressure rating category as a capital letter, and three capital letters identifying the cell classification
designations of the burst pressure, sealing test pressure, and the bolt torque limit, respectively. Thus, a complete flange designation
code shall consist of three letters, three numerals and one letter, and three letters.
4.2.1 Example—RTR-112E-EED.RTR-112F-FFI. This designation describes a filament-wound, glass fiber-reinforced epoxy resin
flange with a taper to taper adhesive joining system. The flange has a 150 psi (1.40 MPa) pressure rating, a burst pressure in excess
of 600 psi (4.1 MPa), a sealing test pressure of 225 psi (1.6 MPa), and a bolt torque limit greater than 75 lbf·ft (102 N·m).
NOTE 3—Flanges with identical classification from different manufacturers may not be interchangeable due to nonstandardization of pipe or socket
diameter, socket length, taper angle, or combination thereof.
TABLE 1 Pressure Categories
Pressure Rating
Designation
psi MPa
A 25 0.17
A 50 0.35
B 50 0.35
B 75 0.52
C 75 0.52
C 100 0.69
D 100 0.69
D 125 0.86
E 125 0.86
E 150 1.04
F 150 1.04
F 175 1.21
G 175 1.21
G 200 1.38
H 200 1.38
H 225 1.55
I 225 1.55
J 250 1.73
K 275 1.89
K 300 2.07
L 300 2.07
L 350 2.42
M 350 2.41
M 400 2.76
N 400 2.76
N 450 3.11
O 450 3.10
P 500 3.45
R 550 3.80
Q 550 3.79
S 600 4.14
R 600 4.13
T 650 4.49
S 650 4.48
U 700 4.83
T 700 4.82
V 750 5.18
U 750 5.17
V 800 5.51
W 800 5.52
W 850 5.86
X 900 6.20
Y 950 6.55
Z 1000 6.89
D4024 − 22
TABLE 2 Burst Pressure, Sealing Test Pressure, and Bolt Torque Limit
A
Property X A A B C D E F G H J K
Burst pressure, psi 200 300 400 500 600 700 800 900 1000 1200
Burst pressure, psi 100 200 300 400 500 600 700 800 900 1000
(MPa) 1.38 2.07 2.76 3.45 4.14 4.83 5.52 6.21 6.90 8.27
(MPa) 0.69 1.38 2.07 2.76 3.45 4.13 4.82 5.51 6.20 6.89
Sealing test pressure, psi 75 115 150 190 225 265 300 340 375 450
Sealing test pressure, psi 37.5 75 113 150 188 225 263 300 338 375
(MPa) 0.52 0.79 1.03 1.31 1.55 1.83 2.07 2.34 2.59 3.10
(MPa) 0.26 0.52 0.78 1.03 1.29 1.55 1.81 2.07 2.33 2.58
Bolt torque limit, lbf·ft. 20 30 50 75 100 125 150 175 200 225
Bolt torque limit, lbf·ft. 15 22.5 30 37.5 45 52.5 60 67.5 75 90
(N·m) 27.1 40.7 67.8 101.7 135.6 169.5 203.4 237.3 271.2 305.1
(N·m) 20.3 30.5 40.7 50.8 61.0 71.2 81.3 91.5 102 122
Property L M N P R S T U V W
Property K L M N O P Q R S T
Burst pressure, psi 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200
Burst pressure, psi 1100 1200 1400 1600 1800 2000 2200 2400 2600 2800
(MPa) 9.65 11.03 12.41 13.79 15.17 16.55 17.93 19.31 20.69 22.06
(MPa) 7.58 8.27 9.65 11.02 12.40 13.78 15.16 16.54 17.91 19.29
Sealing test pressure, psi 525 600 675 750 825 900 975 1050 1125 1200
Sealing test pressure, psi 413 450 525 600 675 750 825 900 975 1050
(MPa) 3.62 4.14 4.65 5.17 5.69 6.21 6.72 7.24 7.76 8.27
(MPa) 2.84 3.10 3.62 4.13 4.65 5.17 5.68 6.20 6.72 7.23
Bolt torque limit, lbf·ft. 105 120 135 150 165 180 195 210 225 263
(N·m) 142 163 183 203 224 244 264 285 305 356
Property U V W X Y Z
Burst pressure, psi 3000 3200 3400 3600 3800 4000
(MPa) 20.67 22.05 23.43 24.80 26.18 27.56
Sealing test pressure, psi 1125 1200 1275 1350 1425 1500
(MPa) 7.75 8.27 8.78 9.30 9.82 10.34
Bolt torque limit, lbf·ft. 250 275 300
Bolt torque limit, lbf·ft. 300 338 375 413 450 488
(N·m) 339.0 372.9 406.8
(N·m) 407 458 508 559 610 661
A
X = unspecified
5. Materials and Manufacture
5.1 Flanges manufactured in accordance with this specification shall be composed of reinforcement imbedded in or surrounded
by cured thermosetting resin. The composite structure may contain granular or platelet fillers, thixotropic agents, pigments, or dyes.
5.2 The resins, reinforcements, and other materials, when combined as composite structure, shall produce a flange that will meet
the performance requirements of this specification.
6. Performance Requirements
6.1 The following performance requirements are intended to provide classification and performance criteria for the purpose of
qualification testing and rating of prototype constructions and periodic reevaluation of the manufacturer’s stated ratings. They are
not intended as routine quality assurance requirements for production runs of rated flanges.
6.2 Flanges shall meet the following performance requirements when joined for testing according to the manufacturer’s
recommended practice for field installation:
6.2.1 Sealing—Flanges shall withstand a pressure of at least 1.5 times the rated design pressure without leakage when tested in
accordance with 10.4.
6.2.2 Short-Term Rupture Strength—Flanges shall withstand a hydrostatic load of at least four times their rated design pressure
without damage to the flange when tested in accordance with 10.5.
6.2.3 Bolt Torque—Flanges shall withstand, without visible sign of damage, a bolt torque
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