ASTM F708-92(2022)
(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.
General Information
Relations
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: F708 − 92 (Reapproved 2022) An American National Standard
Standard Practice for
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Design and Installation of Rigid Pipe Hangers
ThisstandardisissuedunderthefixeddesignationF708;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
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.
3.1.2 rider bar, n—a protective strip of material installed
1.2 This practice provides guidance for the design of hanger
between the pipe and the hanger where frequent linear move-
caps, straps and standoffs, selection of hanger and hanger liner
ment of the pipe is expected.
materials, hanger bolting, and hanger spacing.
3.1.3 rigid pipe hanger, n—a device that transfers the load
1.3 Other hanger designs may be used provided they result
imposed by the piping, insulation, and system medium to the
in an adequately supported vibration-free piping system and
supporting structure.
are compatible with the intended system service and tempera-
ture limitations.
3.1.4 standoff, n—therigidmemberthatconnectsthehanger
strap, saddle, or band to the supporting structure. A standoff is
1.4 The values stated in inch-pound units are to be regarded
usually made up of one or more pieces of flat bar, pipe, angle
as standard. The values given in parentheses are mathematical
bar, or flanged plate to suit a specific location.
conversions to SI units that are provided for information only
and are not considered standard.
4. List of Pipe Hanger Styles
1.5 This standard does not purport to address all of the
4.1 This practice incorporates 26 pipe hanger assemblies as
safety concerns, if any, associated with its use. It is the
shown on Figs. 1-12(c) as follows:
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter- Hanger Fig. No.
mine the applicability of regulatory limitations prior to use.
Split cap hanger (single leg standoff) 1(a)
1.6 This international standard was developed in accor-
Split cap hanger (dual leg standoff) 1(b)
dance with internationally recognized principles on standard- Split cap hanger (chair type) 1(c)
Strap hanger 2(a)
ization established in the Decision on Principles for the
Strap hanger (assembled for clearance with rider bar) 2(b)
Development of International Standards, Guides and Recom-
Strap hanger (assembled for clearance with TFE-fluorocarbon 2(c)
mendations issued by the World Trade Organization Technical strip)
Welded hanger (flat bar U-type) 3(a)
Barriers to Trade (TBT) Committee.
Welded hanger (round bar U-type) 3(b)
Welded hanger (square bar U-type) 3(b)
2. Referenced Documents
U-bolt hanger 4(a)
U-bolt hanger (assembled for clearance with rider bar) 4(b)
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2.1 ASTM Standards:
U-bolt hanger (assembled for clearance with TFE-fluorocarbon 4(c)
strip)
A307 Specification for Carbon Steel Bolts, Studs, and
Welded hanger (single leg standoff welded direct to pipe) 5(a)
Threaded Rod 60 000 PSI Tensile Strength
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)
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Nelson hanger 7
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This practice is under the jurisdiction of ASTM Committee F25 on Ships and
Clamp hanger assembled with mounting channel 8
Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems.
Current edition approved Oct. 1, 2022. Published October 2022. Originally
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approved in 1981. Last previous edition approved in 2018 as F708 – 92 (2018) .
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DOI: 10.1520/F0708-92R22. The sole source of supply of the apparatus known to the committee at this time
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