ASTM C1540-20

Standard Specification for Heavy-Duty Shielded Couplings Joining Hubless Cast Iron Soil Pipe and Fittings

ABSTRACT
This specification covers the performance evaluation of heavy duty shielded couplings to join hubless cast iron soil pipe and fittings. Physical properties of all stainless steel and gaskets shall comply with the specified values. Requirements for the elastomeric gasket, clamp assembly, and couplings such as coupling width are detailed. The test apparatus for deflection test, shear test, and unrestrained hydrostatic joint test are illustrated.
SCOPE
1.1 This specification covers the evaluation of the performance of heavy-duty shielded couplings to join hubless cast iron soil pipe and fittings.  
1.2 Couplings covered by this standard shall have nominal dimensions as found in Table 1 and Fig. 1.  
FIG. 1 Typical Center Stop Detail  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.4 The following precautionary caveat pertains only to the test method portion, Section 7, 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.  
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.

General Information

• Status: Published
• Publication Date: 30-Apr-2020
• ICS: 23.040.60 - Flanges, couplings and joints
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.75 - Gaskets and Coupling for Plumbing and Sewer Piping

Relations

• Replaces: ASTM C1540-18 - Standard Specification for Heavy-Duty Shielded Couplings Joining Hubless Cast Iron Soil Pipe and Fittings
• Effective Date: 01-May-2020
• Refers: ASTM A888-23 - Standard Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste, and Vent Piping Applications
• Effective Date: 01-Nov-2023
• Refers: ASTM A240/A240M-23a - Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
• Effective Date: 01-Nov-2023
• Refers: ASTM A493-23 - Standard Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging
• Effective Date: 01-Nov-2023
• Refers: ASTM C564-20a - Standard Specification for Rubber Gaskets for Cast Iron Soil Pipe and Fittings
• Effective Date: 01-May-2020
• Refers: ASTM C564-20 - Standard Specification for Rubber Gaskets for Cast Iron Soil Pipe and Fittings
• Effective Date: 15-Mar-2020
• Refers: ASTM A888-18a - Standard Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste, and Vent Piping Applications
• Effective Date: 15-Nov-2018
• Refers: ASTM A888-18 - Standard Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste, and Vent Piping Applications
• Effective Date: 01-Mar-2018
• Refers: ASTM A240/A240M-17 - Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
• Effective Date: 01-Nov-2017
• Refers: ASTM A644-17 - Standard Terminology Relating to Iron Castings
• Effective Date: 01-Nov-2017
• Refers: ASTM A888-17a - Standard Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste, and Vent Piping Applications
• Effective Date: 01-Oct-2017
• Refers: ASTM A888-17 - Standard Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste, and Vent Piping Applications
• Effective Date: 01-Jun-2017
• Refers: ASTM A240/A240M-16a - Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
• Effective Date: 01-Dec-2016
• Refers: ASTM A240/A240M-16 - Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
• Effective Date: 01-May-2016
• Refers: ASTM A493-16 - Standard Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging
• Effective Date: 01-Mar-2016

Overview

ASTM C1540-20 is the internationally recognized standard specification for heavy-duty shielded couplings designed for joining hubless cast iron soil pipe and fittings. Established by ASTM International, this standard defines the performance evaluation, materials, dimensions, test methods, and certification requirements for heavy-duty couplings, ensuring the reliability and safety of soil pipe systems used in drainage, waste, and vent piping applications.

The specification sets forth key requirements for clamp assemblies, elastomeric gaskets, stainless steel components, and coupling dimensions. It addresses procedures for rigorous performance testing, including deflection, shear, and hydrostatic joint tests, to verify the integrity of the couplings under challenging conditions.

Key Topics

• Scope and Applicability

  • Covers evaluation of shielded couplings for hubless cast iron soil pipes and fittings.
  • Includes performance requirements, dimensions, material specifications, and test procedures.

• Materials and Construction

  • Specifies all stainless steel for band, shield, and clamp components.
  • Elastomeric gaskets must comply with ASTM C564 and be primarily composed of properly vulcanized polychloroprene (neoprene).
  • Clamp screws/bolts must not have screwdriver slots for increased security.

• Dimensional Standards

  • Coupling widths range by nominal pipe size.
  • Strict tolerances apply to all coupling and gasket dimensions, ensuring compatibility and consistent sealing.

• Testing and Performance Evaluation

  • Mandatory deflection and shear tests simulate in-field stresses.
  • Unrestrained hydrostatic joint tests check leakage and movement resistance at specified pressures, varying by pipe diameter.
  • Markings and identification on assemblies for traceability and quality assurance.

• Certification and Inspection

  • Manufacturer's certification required upon request, confirming tested compliance.
  • Third-party verification procedures for periodic compliance inspections at manufacturing sites.
  • Required markings include manufacturer's name, country of origin, and pipe size.

Applications

Heavy-duty shielded couplings compliant with ASTM C1540-20 are essential components in:

• Sanitary and Storm Drainage Systems: Securely joining hubless cast iron soil pipes in both sanitary waste and storm water applications above and below ground.
• Waste and Vent Piping: Ensuring leak-tight, robust connections in commercial, residential, and industrial vent piping networks.
• Retrofitting and Repair Projects: Facilitating easy, dependable repairs or retrofits by connecting new or existing hubless cast iron piping.
• Plumbing Systems in Industrial/Commercial Buildings: Providing durable coupling solutions capable of withstanding mechanical stresses, vibrations, and hydrostatic pressures.

Utilizing these heavy-duty couplings enhances pipe system integrity, minimizes risk of leakage, and simplifies maintenance, making them ideal for professionals in plumbing, construction, municipal infrastructure, and mechanical systems.

Related Standards

ASTM C1540-20 references several associated standards and resources to ensure comprehensive compliance:

• ASTM A240/A240M: Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip
• ASTM A493: Specification for Stainless Steel Wire and Wire Rods
• ASTM A644: Terminology Relating to Iron Castings
• ASTM A888: Specification for Hubless Cast Iron Soil Pipe and Fittings
• ASTM C564: Specification for Rubber Gaskets for Cast Iron Soil Pipe and Fittings
• ASTM D3677: Identification of Rubber by Infrared Spectrophotometry
• CISPI 301: Specification for Hubless Cast Iron Soil Pipe and Fittings
• CISPI 310: Specification for Couplings with Hubless Cast Iron Soil Pipe and Fittings
• FM 1680: Approval Standard for Couplings Used in Hubless Cast Iron Systems

For a complete and robust plumbing and drainage system, referencing these standards in conjunction with ASTM C1540-20 enables optimal performance, regulatory compliance, and long-term durability.

Standards Content (Sample)

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:C1540 −20
Standard Specification for
Heavy-Duty Shielded Couplings Joining Hubless Cast Iron
Soil Pipe and Fittings
This standard is issued under the fixed designation C1540; 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 A888 Specification for Hubless Cast Iron Soil Pipe and
Fittings for Sanitary and Storm Drain, Waste, and Vent
1.1 This specification covers the evaluation of the perfor-
Piping Applications
mance of heavy-duty shielded couplings to join hubless cast
C564 Specification for Rubber Gaskets for Cast Iron Soil
iron soil pipe and fittings.
Pipe and Fittings
1.2 Couplings covered by this standard shall have nominal
D3677 Test Methods for Rubber—Identification by Infrared
dimensions as found in Table 1 and Fig. 1.
Spectrophotometry
1.3 The values stated in inch-pound units are to be regarded 2.2 CISPI Standards:
as standard. The values given in parentheses are mathematical
CISPI 301 Specification for Hubless Cast Iron Soil Pipe and
conversions to SI units that are provided for information only Fittings for Sanitary and Storm Drain, Waste and Vent
and are not considered standard.
Piping Applications
CISPI 310 Specification for Couplings for Use in Connec-
1.4 The following precautionary caveat pertains only to the
tion with Hubless Cast Iron Soil Pipe and Fittings for
test method portion, Section 7, of this specification. This
Sanitary and Storm Drain, Waste, and Vent Piping Appli-
standard does not purport to address all of the safety concerns,
cations
if any, associated with its use. It is the responsibility of the user
2.3 Factory Mutual Standard:
of this standard to establish appropriate safety, health, and
FM 1680 Approval Standard for Couplings Used in Hubless
environmental practices and determine the applicability of
Cast Iron Systems for Drain, Waste or Vent, Sewer,
regulatory limitations prior to use.
Rainwater, or Storm Drain Systems Above and Below
1.5 This international standard was developed in accor-
Ground, Industrial/Commercial and Residential
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
3. Terminology
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 3.1 Definitions of the following terms used in this specifi-
Barriers to Trade (TBT) Committee. cation are found in Terminology A644.
3.2 Definitions of Terms Specific to This Standard:
2. Referenced Documents
3.2.1 center stop, n—an integral part of the gasket centered
2.1 ASTM Standards:
on the axial length of the gasket, intended to limit the insertion
A240/A240M Specification for Chromium and Chromium-
depth of the pipe to be coupled.
Nickel Stainless Steel Plate, Sheet, and Strip for Pressure
3.2.2 clamp assembly, n—that portion of the coupling ex-
Vessels and for General Applications
cluding the gasket.
A493 Specification for Stainless Steel Wire and Wire Rods
3.2.3 coupling, n—the complete assembly.
for Cold Heading and Cold Forging
A644 Terminology Relating to Iron Castings 3.2.4 coupling manufacturer, n—the entity that assembles
the gasket with the clamp and shield assembly.
1 3.2.5 fitting, n—parts of a pipeline other than straight pipes,
This specification is under the jurisdiction of ASTM Committee A04 on Iron
Castings and is the direct responsibility of Subcommittee A04.75 on Gaskets and
valves, or couplings.
Coupling for Plumbing and Sewer Piping.
3.2.6 gasket, n—the elastomeric portion of the coupling.
Current edition approved May 1, 2020. Published May 2020. Originally
approved in 2002. Last previous edition approved in 2018 as C1540 – 18. DOI:
10.1520/C1540-20.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Cast Iron Soil Pipe Institute (CISPI), 2401 Fieldcrest Dr.,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Mundelein, IL 60060, http://www.cispi.org.
Standards volume information, refer to the standard’s Document Summary page on Available from FM Approvals, P.O. Box 9102, Norwood, MA 02062. http://
the ASTM website. www.fmglobal.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1540−20
TABLE 1 Coupling Width
5.2.1 Theelastomericgasketshallhaveaninsidecenterstop
Nominal Pipe Size Nominal Coupling Width that does not create an enlargement chamber or recess with a
1 ⁄2 to 4 in. (38 to 100 mm) 3 in. (76 mm) ledge, shoulder, or reduction of pipe area or offer an obstruc-
5 to 10 in. (127 to 254 mm) 4 in. (100 mm)
tion to flow.
12 to 15 in. (305 to 381 mm) 5 ⁄2 in. (140 mm)
5.2.2 The elastomeric gasket shall be free of defects that
affect the use and serviceability.
3.2.7 gasket manufacturer, n—the entity that molds the
6. Clamp Assembly Requirements
gaskets inserted into the couplings covered by this standard
6.1 The clamp assembly shall be made of material conform-
specification.
ing to the requirements as outlined in Sections 4 and 6, Table
3.2.8 heavy-duty coupling, n—a shielded coupling that has
3, and Fig. 3.
dimensions detailed in Table 1 and Fig. 1.
6.1.1 All metallic parts shall be of 300 series stainless steel
3.2.9 joint, n—the point of assembly consisting of the
and shall conform to the requirements of Specification A240/
coupling and the joined pipes or fittings, or both.
A240M. All metallic parts made from round stock shall be of
3.2.10 shield, n—an external metallic protective device
300 series stainless steel and shall conform to the requirements
designed to protect the sealing gasket from external elements
of Specification A493 (excluding copper-bearing alloys).
that could cause failure of the sealing assembly.
6.1.2 Clamp assemblies shall be tested to withstand no less
than 125 % of the manufacturer’s stated installation torque
4. Materials and Manufacture
without visible signs of failure. The clamp assembly shall be
4.1 Physical and chemical properties of gaskets shall com- tested over a steel mandrel of the appropriate diameter and
torqued as required. These tests shall be performed on ran-
plywithSpecificationC564inaccordancewithColumn“C”of
Table 1 of that document. Typical dimensions shall be in domly selected samples during the course of production as
needed, but not less than one clamp per shift per size during
accordance with Fig. 2 and Table 2.
clamp assembly production.
TABLE 2 Dimensional Tolerances for Gasket Sleeves
7. Couplings Requirements and Test Methods
A
Size, in. Fixed, ± Closure, ±
1 ⁄2 0.020 0.050
7.1 Assemble each coupling to be tested according to the
2 0.020 0.050
manufacturer’s instructions between two sections of randomly
3 0.020 0.050
4 0.020 0.050
selected hubless cast iron soil pipe meeting the requirements of
5 0.025 0.055
CISPI 301 or Specification A888 and conduct deflection and
6 0.025 0.055
shear tests. In addition, unrestrained hydrostatic tests shall be
8 0.030 0.063
10 0.030 0.063
performed as detailed in 7.2. The deflection and shear tests
12 0.035 0.063
shallbeperformedoneachsizeandtypecouplingutilizingfirst
15 0.035 0.063
article approval as required, not to exceed 120 days. The
A
Gasket closure tolerances shall be applied to the average of three (3) readings
unrestrained hydrostatic test shall be performed on randomly
per coupling.
selected couplings of each size during the course of production
using first article selection, not to exceed 30 days.
7.1.1 Deflection Test:
4.2 Clamp assembly screws or bolts shall not have screw-
7.1.1.1 A test apparatus such as the one shown in Fig. 4 is
driver slots.
suggested. Other testing apparatus that provide restraint to the
4.3 All stainless steel shall meet the physical requirements
assembly shall also be permitted. Close the outboard ends of
of Specification A240/A240M.
the pipe with test plugs.
7.1.1.2 Fill the assembly with water, expel all air, and
5. Elastomeric Gasket Requirements
hydrostatically pressurize to 8.6 psi (59.3 kPa) for the duration
5.1 The gasket shall be tested in accordance with Test
of the test. One pipe shall be rigidly supported and, while the
Methods D3677 and be manufactured from a properly vulca-
assembly is under pressure, raise the opposite end of the other
nized virgin compound where the primary elastomer is poly-
pipe1in.(25mm)perlinealfootofpipe.Maintainthepressure
chloroprene (neoprene).
for 15 min. Any leakage shall mean failure.
5.2 The elastomeric gasket shall consist of a one-piece 7.1.2 Shear Test:
construction conforming to the physical requirements of Speci- 7.1.2.1 Support two joined lengths of randomly selected
fication C564. The gaskets shall be tested by the gasket hubless cast iron soil pipe on blocks, a minimum of 1 ⁄2 in.
manufacturerforcompliancetoSpecificationC564aminimum (38.1 mm) high, at three locations. One length shall be a
of 24 h after production, but not longer than 72 h after time of minimum of 24 in. (609.6 mm) in length, supported on blocks,
production. These tests shall include hardness, elongation and one near the uncoupled end, and the other immediately
tensile strength, tear strength, and compression set. Heat, adjacenttothecouplings.Firmlyrestrainthislengthinposition
aging, water absorption, ozone resistance, and oil immersion as shown in Fig. 5. The other coupled length shall be a
tests shall be conducted annually or when a formulation minimum of 5 ft (1.52 m) in length and supported by a single
changes, or a suppl
...

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: C1540 − 18 C1540 − 20
Standard Specification for
Heavy-Duty Shielded Couplings Joining Hubless Cast Iron
Soil Pipe and Fittings
This standard is issued under the fixed designation C1540; 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 the evaluatingevaluation of the performance of heavy-duty shielded couplings to join hubless cast
iron soil pipe and fittings.
1.2 Couplings covered by this standard shall have nominal dimensions as found in Table 1 and Fig. 1.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.4 The following precautionary caveat pertains only to the test method portion, Section 7, 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.
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:
A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and
for General Applications
A493 Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging
A644 Terminology Relating to Iron Castings
A888 Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste, and Vent Piping
Applications
C564 Specification for Rubber Gaskets for Cast Iron Soil Pipe and Fittings
D3677 Test Methods for Rubber—Identification by Infrared Spectrophotometry
2.2 CISPI Standards:
CISPI-301CISPI 301 Specification for Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste and Vent
Piping Applications
CISPI-310CISPI 310 Specification for Couplings for Use in Connection Withwith Hubless Cast Iron Soil Pipe and Fittings for
Sanitary and Storm Drain, Waste, and Vent Piping Applications
2.3 Factory Mutual Standard:
FM 1680 Approval Standard for Couplings Used in Hubless Cast Iron Systems for Drain, Waste or Vent, Sewer, Rainwater, or
Storm Drain Systems Above and Below Ground, Industrial/Commercial and Residential
This specification is under the jurisdiction of ASTM Committee A04 on Iron Castings and is the direct responsibility of Subcommittee A04.75 on Gaskets and Coupling
for Plumbing and Sewer Piping.
Current edition approved Feb. 1, 2018May 1, 2020. Published February 2018May 2020. Originally approved in 2002. Last previous edition approved in 20152018 as
C1540 – 15.C1540 – 18. DOI: 10.1520/C1540-18.10.1520/C1540-20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from Cast Iron Soil Pipe Institute (CISPI), 2401 Fieldcrest Dr., Mundelein, IL 60060, http://www.cispi.org.
Available from FM Approvals, P.O. Box 9102, Norwood, MA 02062. http://www.fmglobal.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1540 − 20
TABLE 1 Coupling Width
Nominal Pipe Size Nominal Coupling Width
1 ⁄2 to 4 in. (38 to 100 mm) 3 in. (76 mm)
5 to 10 in. (127 to 254 mm) 4 in. (100 mm)
12 to 15 in. (305 to 381 mm) 5 ⁄2 in. (140 mm)
3. Terminology
3.1 Definitions of the following terms used in this specification are found in Terminology A644.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 center stop, n—an integral part of the gasket centered on the axial length of the gasket, intended to limit the insertion depth
of the pipe to be coupled.
3.2.2 clamp assembly, n—that portion of the coupling excluding the gasket.
3.2.3 coupling, n—the complete assembly.
3.2.4 coupling manufacturer, n—the entity that assembles the gasket with the clamp and shield assembly.
3.2.5 fitting, n—parts of a pipeline other than straight pipes, valves, or couplings.
3.2.6 gasket, n—the elastomeric portion of the coupling.
3.2.7 gasket manufacturer, n—the entity that molds the gaskets inserted into the couplings covered by this standard specification.
3.2.8 heavy-duty coupling, n—a shielded coupling that has dimensions detailed in Table 1 and Fig. 1.
3.2.9 joint, n—the point of assembly consisting of the coupling and the joined pipes or fittings, or both.
3.2.10 shield, n—an external metallic protective device designed to protect the sealing gasket from external elements that could
cause failure of the sealing assembly.
4. Materials and Manufacture
4.1 Physical and chemical properties of gaskets shall comply with Specification C564 in accordance with Column “C” of Table
1 of that document. Typical dimensions shall be in accordance with Fig. 2 and Table 2.
TABLE 2 Dimensional Tolerances for Rubber – Standard
Dimensional Tolerances RMA CLASS 3
Size, in. Fixed, ± Closure, ±
0 to 0.499 0.010 0.015
0.500 to 0.999 0.010 0.018
1.000 to 1.999 0.015 0.020
2.000 to 2.999 0.020 0.025
3.000 to 3.999 0.025 0.030
4.000 to 4.999 0.030 0.035
5.000 to 7.999 0.035 0.050
TABLE 2 Dimensional Tolerances for Gasket Sleeves
A
Size, in. Fixed, ± Closure, ±
1 ⁄2 0.020 0.050
2 0.020 0.050
3 0.020 0.050
4 0.020 0.050
5 0.025 0.055
6 0.025 0.055
8 0.030 0.063
10 0.030 0.063
12 0.035 0.063
15 0.035 0.063
A
Gasket closure tolerances shall be applied to the average of three (3) readings
per coupling.
NOTE 1—8.000 and over—multiplied by 0.0050. These are commercial
tolerances. All diametric dimensions shall have a tolerance of 61 %.
4.2 Clamp assembly screws or bolts shall not have screwdriver slots.
4.3 All stainless steel shall meet the physical requirements of Specification A240/A240M.
C1540 − 20
FIG. 1 Typical Center Stop Detail
Dimensions
1 1/2 in. 2 in. 3 in. 4 in. 5 in. 6 in. 8 in. 10 in. 12 in. 15 in.
A 1.500 1.500 1.500 1.500 2.000 2.000 2.000 2.000 2.750 2.750
B 3.000 3.000 3.000 3.000 4.000 4.000 4.000 4.000 5.500 5.500
D1 1.531 1.968 2.968 3.968 4.968 5.968 7.968 9.975 12.000 15.200
D2 1.937 2.343 3.343 4.343 5.343 6.343 8.343 10.350 12.430 15.650
NOTE 1—The dimensions A and B found in the table are mandatory. Dimensions D1 and D2 found in the table are referenced only for mold design.
Sealing ring shape and dimensions are to manufacturer’s design.
NOTE 2—Dimensional tolerances to be RMA Class 3 (see Table 2).
FIG. 2 Rubber Gasket
5. Elastomeric Gasket Requirements
5.1 The gasket shall be tested in accordance with Test Methods D3677 and be manufactured from a properly vulcanized virgin
compound where the primary elastomer is polychloroprene (neoprene).
5.2 The elastomeric gasket shall consist of a one-piece construction conforming to the physical requirements of Specification
C564. The gaskets shall be tested by the gasket manufacturer for compliance to Specification C564 a minimum of 24 h after
production, but not longer than 72 h after time of production. These tests shall include hardness, elongation and tensile strength,
C1540 − 20
tear strength, and compression set. Heat, aging, water absorption, ozone resistance, and oil immersion tests shall be conducted
annually or when a formulation changes, or a supplier changes, whichever occurs first.
5.2.1 The elastomeric gasket shall have an inside center stop that does not create an enlargement chamber or recess with a ledge,
shoulder, or reduction of pipe area or offer an obstruction to flow.
5.2.2 The elastomeric gasket shall be free of defects that affect the use and serviceability.
6. Clamp Assembly Requirements
6.1 The clamp assembly shall be made of material conforming to the requirements as outlined in Sections 4 and 6, Table 3, and
Fig. 3.
6.1.1 All metallic parts shall be of 300 series stainless steel and shall conform to the requirements of Specification
A240/A240M. All metallic parts made from round stock shall be of 300 series stainless steel and shall conform to the requirements
of Specification A493 (excluding copper-bearing alloys).
6.1.2 Clamp assemblies shall be tested to withstand no less than 125 % of the manufacturer’s stated installation torque without
visible signs of failure. The clamp assembly shall be tested over a steel mandrel of the appropriate diameter and torqued as
required. These tests shall be performed on randomly selected samples during the course of production as needed, but not less than
one clamp per shift per size during clamp assembly production.
TABLE 3 Material Specifications
Band Type 301 AISI stainless steel –
minimum tensile 140 000 psi for 1 ⁄2 to
15 in.; Type 304 AISI stainless steel is
permitted.
Band Type 301 AISI stainless steel—
minimum tensile 140 000 psi for 1 ⁄2 to
15 in.; Type 304 AISI stainless steel is
permitted.
Type 304 AISI stainless steel –
minimum tensile 140 000 psi
Type 304 AISI stainless steel—
minimum tensile 140 000 psi
Eyelets/Rivets Type 300 grade AISI stainless steel
Screw Housing Type 301 AISI stainless steel for 1 ⁄2
to 15 in.; Type 304 AISI stainless steel
is permitted.
Screw Type 305 AISI or Type 304L, or both,
annealed stainless steel –
manufacturers shall identify
recommended installation torques for
their couplings either on the couplings
or within installation instructions.
Screw Type 305 AISI or Type 304L, or both,
annealed stainless steel—
manufacturers shall identify
recommended installation torques for
their couplings either on the couplings
or within installation instructions.
Shield Type 301 AISI or Type 304, or both,
AISI stainless steel (annealed and
pickled not acceptable)
Hardness – Rockwell B-100 (Vickers
240) in accordance with A240/A240M
max (max burr height not to exceed
25 % of thickness)
Hardness—Rockwell B-100 (Vickers
240) in accordance with A240/A240M
max (max burr height not to exceed
25 % of thickness)
Thickness – 0.0065 in. min
Thickness—0.0065 in. min
-
...