ASTM F708-24
(Practice)Standard Practice for Design and Installation of Rigid Pipe Hangers
Standard Practice for Design and Installation of Rigid Pipe Hangers
ABSTRACT
This practice covers acceptable methods of fabricating and installing rigid pipe hangers used to support shipboard piping systems, it provides guidance for the design of hanger caps, straps and standoffs, selection of hanger and hanger liner materials, hanger bolting, and hanger spacing. The pipe hanger style includes: split cap hanger, 3strap hanger, welded hanger, U-bolt hanger, J band type hanger, Nelson hanger, clamp hanger assembled with mounting channel, poly-block twin clamp hanger, crimp-on weld stud-type hangers, banded weld stud-type hanger, and poly-block single-clamp hanger. Guidance in determining pipe hanger spacing are provided. Special consideration should be given to areas of concentrated loads, such as risers, valves, or groups of fittings, and to piping configurations that could create rotational forces. Hangers need not be lined unless the hanger and pipe are of dissimilar material. All hanger bolts within tanks or other inaccessible areas shall be secured with lock nuts, lock washers, or by some other means. Pipe hangers and standoffs located in areas subject to corrosion, such as in bilges, ballast tanks, and areas exposed to the weather, should be zinc-plated or blasted and coated with inorganic zinc or coated with the same material as that of the surrounding area. Standoffs fabricated from pipe should not be used within tanks. Consideration should be given to thermal growth of the piping when selecting or locating hangers so as not to overstress the piping or hangers.
SCOPE
1.1 This practice covers acceptable methods of fabricating and installing rigid pipe hangers used to support shipboard piping systems with temperatures of 650 °F (343 °C) or less.
1.2 This practice provides guidance for the design of hanger caps, straps and standoffs, selection of hanger and hanger liner materials, hanger bolting, and hanger spacing.
1.3 Other hanger designs may be used provided they result in an adequately supported vibration-free piping system and are compatible with the intended system service and temperature limitations.
1.4 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.
1.5 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.
1.6 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.
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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: F708 − 24 An American National Standard
Standard Practice for
1
Design and Installation of Rigid Pipe Hangers
This standard is issued under the fixed designation F708; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3. Terminology
1.1 This practice covers acceptable methods of fabricating 3.1 Definitions:
and installing rigid pipe hangers used to support shipboard
3.1.1 liner, n—the material used to isolate a pipe from its
piping systems with temperatures of 650 °F (343 °C) or less.
hanger.
1.2 This practice provides guidance for the design of hanger
3.1.2 rider bar, n—a protective strip of material installed
caps, straps and standoffs, selection of hanger and hanger liner
between the pipe and the hanger where frequent linear move-
materials, hanger bolting, and hanger spacing.
ment of the pipe is expected.
1.3 Other hanger designs may be used provided they result
3.1.3 rigid pipe hanger, n—a device that transfers the load
in an adequately supported vibration-free piping system and
imposed by the piping, insulation, and system medium to the
are compatible with the intended system service and tempera-
supporting structure.
ture limitations.
3.1.4 standoff, n—the rigid member that connects the hanger
1.4 The values stated in inch-pound units are to be regarded
strap, saddle, or band to the supporting structure. A standoff is
as standard. The values given in parentheses are mathematical
usually made up of one or more pieces of flat bar, pipe, angle
conversions to SI units that are provided for information only
bar, or flanged plate to suit a specific location.
and are not considered standard.
1.5 This standard does not purport to address all of the
4. List of Pipe Hanger Styles
safety concerns, if any, associated with its use. It is the
4.1 This practice incorporates 26 pipe hanger assemblies as
responsibility of the user of this standard to establish appro-
shown on Figs. 1-9 as follows:
priate safety, health, and environmental practices and deter-
Hanger Fig. No.
mine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accor-
Split cap hanger (single leg standoff) 1(a)
Split cap hanger (dual leg standoff) 1(b)
dance with internationally recognized principles on standard-
Split cap hanger (chair type) 1(c)
ization established in the Decision on Principles for the
Strap hanger 2(a)
Development of International Standards, Guides and Recom-
Strap hanger (assembled for clearance with rider bar) 2(b)
Strap hanger (assembled for clearance with TFE-fluorocarbon 2(c)
mendations issued by the World Trade Organization Technical
strip)
Barriers to Trade (TBT) Committee.
Welded hanger (flat bar U-type) 3(a)
Welded hanger (round bar U-type) 3(b)
2. Referenced Documents Welded hanger (square bar U-type) 3(b)
U-bolt hanger 4(a)
2
2.1 ASTM Standards:
U-bolt hanger (assembled for clearance with rider bar) 4(b)
U-bolt hanger (assembled for clearance with TFE-fluorocarbon 4(c)
A307 Specification for Carbon Steel Bolts, Studs, and
strip)
Threaded Rod 60 000 PSI Tensile Strength
Welded hanger (single leg standoff welded direct to pipe) 5(a)
Welded hanger (dual leg standoff welded direct to pipe) 5(b)
“J” band type hanger (insulated pipe) 6(a)
“J” band type hanger (bare pipe) 6(b)
1
This practice is under the jurisdiction of ASTM Committee F25 on Ships and
Clamp hanger assembled with mounting channel 7
Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Crimp-on weld stud-type hangers 8
Machinery and Piping Systems.
Banded weld stud-type hanger 9
Current edition approved Jan. 1, 2024. Published January 2024. Originally
approved in 1981. Last previous edition approved in 2022 as F708 – 92 (2022).
5. Hanger Designs
DOI: 10.1520/F0708-24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 Figs. 1-5 and Fig. 6(a) hangers are designs generally
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
manufactured by shipyards or their subcontractors. See also
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Tables 1-6.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F708 − 24
5.2
...
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: F708 − 92 (Reapproved 2022) F708 − 24 An American National Standard
Standard Practice for
1
Design and Installation of Rigid Pipe Hangers
This standard is issued under the fixed designation F708; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This practice covers acceptable methods of fabricating and installing rigid pipe hangers used to support shipboard piping
systems with temperatures of 650 °F (343 °C) or less.
1.2 This practice provides guidance for the design of hanger caps, straps and standoffs, selection of hanger and hanger liner
materials, hanger bolting, and hanger spacing.
1.3 Other hanger designs may be used provided they result in an adequately supported vibration-free piping system and are
compatible with the intended system service and temperature limitations.
1.4 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.
1.5 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.
1.6 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
2.1 ASTM Standards:
A307 Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength
3. Terminology
3.1 Definitions:
3.1.1 liner, n—the material used to isolate a pipe from its hanger.
1
This practice is under the jurisdiction of ASTM Committee F25 on Ships and Marine Technology and is the direct responsibility of Subcommittee F25.11 on Machinery
and Piping Systems.
Current edition approved Oct. 1, 2022Jan. 1, 2024. Published October 2022January 2024. Originally approved in 1981. Last previous edition approved in 20182022 as
ɛ1
F708 – 92 (2018)(2022). . DOI: 10.1520/F0708-92R22.10.1520/F0708-24.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F708 − 24
3.1.2 rider bar, n—a protective strip of material installed between the pipe and the hanger where frequent linear movement of the
pipe is expected.
3.1.3 rigid pipe hanger, n—a device that transfers the load imposed by the piping, insulation, and system medium to the supporting
structure.
3.1.4 standoff, n—the rigid member that connects the hanger strap, saddle, or band to the supporting structure. A standoff is usually
made up of one or more pieces of flat bar, pipe, angle bar, or flanged plate to suit a specific location.
4. List of Pipe Hanger Styles
4.1 This practice incorporates 26 pipe hanger assemblies as shown on Figs. 1-912(c) as follows:
Hanger Fig. No.
Split cap hanger (single leg standoff) 1(a)
Split cap hanger (dual leg standoff) 1(b)
Split cap hanger (chair type) 1(c)
Strap hanger 2(a)
Strap hanger (assembled for clearance with rider bar) 2(b)
Strap hanger (assembled for clearance with TFE-fluorocarbon strip) 2(c)
Welded hanger (flat bar U-type) 3(a)
Welded hanger (round bar U-type) 3(b)
Welded hanger (square bar U-type) 3(b)
U-bolt hanger 4(a)
U-bolt hanger (assembled for clearance with rider bar) 4(b)
U-bolt hanger (assembled for clearance with TFE-fluorocarbon strip) 4(c)
Welded hanger (single leg standoff welded direct to pipe) 5(a)
Welded hanger (dual leg standoff welded direct to pipe) 5(b)
“J” band type hanger (insulated pipe) 6(a)
“J” band type hanger (bare pipe) 6(b)
3
Nelson hanger 7
Clamp hanger assembled with mounting channel
...
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