ASTM F708-92(2008)
(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 the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: F708 − 92(Reapproved 2008) An American National Standard
Standard Practice for
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 priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This practice covers acceptable methods of fabricating
and installing rigid pipe hangers used to support shipboard
2. Referenced Documents
piping systems with temperatures of 650°F (343°C) or less.
2.1 ASTM Standards:
1.2 This practice provides guidance for the design of hanger
A307 Specification for Carbon Steel Bolts, Studs, and
caps, straps and standoffs, selection of hanger and hanger liner
Threaded Rod 60 000 PSI Tensile Strength
materials, hanger bolting, and hanger spacing.
3. Terminology
1.3 Other hanger designs may be used provided they result
3.1 Definitions:
in an adequately supported vibration-free piping system and
3.1.1 liner—the material used to isolate a pipe from its
are compatible with the intended system service and tempera-
hanger.
ture limitations.
3.1.2 rider bar—a protective strip of material installed
1.4 The values stated in inch-pound units are to be regarded
between the pipe and the hanger where frequent linear move-
as the standard. The values given in parentheses are for
ment of the pipe is expected.
information only.
3.1.3 rigid pipe hanger—a device that transfers the load
1.5 This standard does not purport to address all of the
imposed by the piping, insulation, and system medium to the
safety concerns, if any, associated with its use. It is the
supporting structure.
responsibility of the user of this standard to establish appro-
3.1.4 standoff—the rigid member that connects the hanger
strap, saddle, or band to the supporting structure. A standoff is
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. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2008. Published December 2008. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1981. Last previous edition approved in 2004 as F708 – 92 (2004). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/F0708-92R08. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F708 − 92 (2008)
usually made up of one or more pieces of flat bar, pipe, angle 5. Hanger Designs
bar, or flanged plate to suit a specific location.
5.1 Figs. 1-5 and Fig. 6(a) hangers are designs generally
4. List of Pipe Hanger Styles manufactured by shipyards or their subcontractors. See also
Tables 1-6.
4.1 This practice incorporates 26 pipe hanger assemblies as
shown on Figs. 1-12(c) as follows:
5.2 Fig. 6, Fig. 8, Fig. 10, and Fig. 11 hangers are commer-
cially available from various vendors. Fig. 8, Fig. 10, and Fig.
Hanger Fig. No.
11 hangers are primarily designed for use in supporting
Split cap hanger (single leg standoff) 1(a)
electrical cables, but are suitable for hanging small size pipe
Split cap hanger (dual leg standoff) 1(b)
and tubing.
Split cap hanger (chair type) 1(c)
3,4
Strap hanger 2(a)
5.2.1 The Fig. 7 hanger is a specific design that has been
Strap hanger (assembled for clearance with rider bar) 2(b)
patented by Nelson Division of TRW.
Strap hanger (assembled for clearance with TFE-fluorocarbon 2(c)
5,6,4
strip)
5.2.2 The Fig. 9 and Fig. 12 hangers are primarily
Welded hanger (flat bar U-type) 3(a)
designed for use when supporting multiple runs of pipe or
Welded hanger (round bar U-type) 3(b)
Welded hanger (square bar U-type) 3(b) tubing.
U-bolt hanger 4(a)
U-bolt hanger (assembled for clearance with rider bar) 4(b)
6. Materials and Manufacture
U-bolt hanger (assembled for clearance with TFE-fluorocarbon 4(c)
strip)
6.1 Hanger materials for straps, saddles, and U-bolts for
Welded hanger (single leg standoff welded direct to pipe) 5(a)
Welded hanger (dual leg standoff welded direct to pipe) 5(b) Figs. 1-5 hangers and standoffs should be fabricated from
“J” band type hanger (insulated pipe) 6(a)
commercial quality carbon steel. The steel should be a weld-
“J” band type hanger (bare pipe) 6(b)
3,4 able grade with a minimum tensile strength of 47 ksi (324
Nelson® hanger 7
Clamp hanger assembled with mounting channel 8 MPa) and capable of being bent at room temperature through
5,6 ,4
Poly-block twin clamp hanger (assembled with welding plate) 9(a)
90° to an inside radius equal to the material thickness without
5,6 ,4
Poly-block twin clamp hanger (assembled with welding stud) 9(b)
5,6
cracking on the outside of the bend.
Poly-block twin clamp hanger (assembled with mounting channel) 9(c)
,
6.2 Hangers in Fig. 1, Fig. 6, Fig. 7, Fig. 10, and Fig. 11 are
Crimp-on weld stud-type hangers 10
Banded weld stud-type hanger 11 generally manufactured from carbon steel. Fig. 8 is furnished
4,6
Poly-block single-clamp hanger (assembled with welding plate) 12(a)
in carbon steel and stainless steel. Fig. 9 and Fig. 12 hanger
4,6
Poly-block single-clamp hanger (assembled with welding stud) 12(b)
clamp halves are injected molded plastic furnished with carbon
Poly-block single-clamp hanger (assembled with mounting 12(c)
4,6
channel)
steel or stainless steel hardware.
6.3 Bands and buckles for Fig. 6 and Fig. 11 hangers should
The sole source of supply of the apparatus known to the committee at this time
be carbon steel electroplated zinc or stainless steel.
is TRW Nelson Div., Toledo Ave. and E. 28th St., Lorain, OH 44055.
If you are aware of alternative suppliers, please provide this information to
6.4 Hanger bolts and nuts should be regular series hex type
ASTM International Headquarters. Your comments will receive careful consider-
ation at a meeting of the responsible technical committee , which you may attend. electroplated zinc with unified national coarse threads Class 2
The sole source of supply of the apparatus known to the committee at this time
fit in accordance with Specification A307, Grade B.
is Stauff Corp., 41 Newman St., Hackensack, NJ 07601.
The sole source of supply of the poly-block hangers known to the committee at
6.5 Table 7is a listing of hanger liner materials generally
this time is Behringer Corp., 108 Jabez St., Newark, NJ 07105.
used to isolate the pipe from the hanger (see 9.1.1).
NOTE 1—For dimensions of hangers, see Table 1.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and can be used lined or unlined.
NOTE 3—For Fig. 1(b), length of standoff legs may be unequal and angle of attachment may vary as required to suit conditions.
NOTE 4—Maximum length of standoff “L” shall be as follows: flat bar = 18 in.; pipe = 30 in.; and angle bar = 42 in.
FIG. 1 Split Cap Hangers
F708 − 92 (2008)
NOTE 1—For dimensions of hangers, see Table 2.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and can be used lined or unlined.
1 1
NOTE 3—Install standard flat washers as necessary to unlined strap to provide ⁄32 to ⁄8-in. (0.8 to 3.2-mm) clearance for linear motion of piping when
required.
FIG. 2 Strap Hangers
NOTE 1—For dimensions of hangers, see Table 3.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and are intended to be used unlined only.
NOTE 3—Weld as indicated for size 3-in. NPS and above. For 2 ⁄2-in. NPS and below, weld hanger on outside only.
FIG. 3 Welded Hangers
7. Application and Limitations of concentrated loads, such as risers, valves, or groups of
fittings, and to piping configurations that could create rota-
7.1 Unless otherwise noted, application and limitations on
tional forces.
the use of various style hangers should be as noted with each
hanger detail.
9. General Requirements
8. Hanger Spacing
9.1 The following general requirements and conditions are
8.1 Table 8 provides general guidance in determining pipe
applicable to all styles of hangers:
hanger spacing. Special consideration should be given to areas
F708 − 92 (2008)
NOTE 1—For dimensions of hangers, see Table 4.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and are intended to be used unlined.
FIG. 4 U-Bolt Hangers
NOTE 1—For dimensions of hangers, see Table 5.
NOTE 2—These hangers are limited to use on normally dry ferrous piping systems, such as sounding tubes. Air escapes and plumbing drains with a
wall thickness of 0.200 in. (5.1 mm) or more.
NOTE 3—These hangers should not be used where takedown is required or in the steering gear room, inner bottoms, fore peak, aft peak or deep tanks,
or other high vibration or inaccessible areas.
NOTE 4—For Fig. 5(b), length of standoff legs may be unequal and angle of attachment may vary as required to suit conditions.
FIG. 5 Welded Hangers
9.1.1 Hangers need not be lined unless the hanger and pipe 9.1.3 Pipe hangers and standoffs located in areas subject to
are of dissimilar material, or when the system internal operat- corrosion, such as in bilges, ballast tanks, and areas exposed to
ing temperature is 300°F (149°C) and over, or 50°F (10°C) and the weather, should be zinc-plated or blasted and coated with
under and the heat transmitted to the other side of the structure inorganic zinc or coated with the same material as that of the
to which the hanger is attached may be objectionable. For surrounding area.
hanger liner materials, see 6.5. 9.1.4 Standoffs fabricated from pipe should not be used
9.1.2 All hanger bolts within tanks or other inaccessible within tanks.
areas shall be secured with lock nuts, lock washers, or by some 9.1.5 Wherethermalgrowthofpipingexceeds0.100in.(2.5
other means. mm) or long runs of pipe are affected by ship flexing, such as
F708 − 92 (2008)
NOTE 1—For dimensions of hangers, see Table 6.
NOTE 2—These hangers are suitable for use in all locations, except tanks and areas exposed to the weather, and can be used lined or unlined.
FIG. 6 J-Band Type Hangers
NOTE 1—This hanger is suitable for use in all locations except tanks.
NOTE 2—This hanger is limited to use on pipe 4-in. NPS and below with a system operating temperature of 200°F (93.3°C) or less.
FIG. 7 Nelson Hanger
long runs on the weather deck, or long runs in longitudinal passageways, a metal rider bar attached to the pipe or a
F708 − 92 (2008)
NOTE 1—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather. When used in areas subject to high
corrosion, such as salt water ballast tanks or weather decks, stainless steel hanger components shall be used.
NOTE 2—These hangers are suitable for supporting single or multiple runs of piping 2 in. (50.8 mm) or smaller.
FIG. 8 Clamp Hanger Assembled with Mounting Channel
NOTE 1—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather. When used in areas subject to high
corrosion, such as salt water ballast tanks or weather decks, stainless steel hanger components shall be used.
1 1
NOTE 2—These hangers are limited to use on pipe 1 ⁄4-in. NPS and below and tubing 1 ⁄2-in. outside diameter and below with a system operating
temperature of 300°F (149°C) or less.
NOTE 3—These hangers may be used for multiple pipe installations installed vertically, horizontally, or stacked using a welding plate, welding stud,
or attached to a mounting channel.
4, 5, 6
FIG. 9 Stauff Twin Clamp Hanger
TFE-fluorocarbon wear strip should be used in conjunction 10. Workmanship, Finish, and Appearance
with a clearance type hanger, or other means should be
10.1 Finished hanger components shall have a workman-
provided to prevent chaffing of the pipe.
like appearance and be free of cracks or other injurious defects.
9.1.6 Consideration should be given to thermal growth of
Surface scale, rust, welding slag, or any foreign material (such
the piping when selecting or locating hangers so as not to
as oil) shall be removed before painting or coating.
overstress the piping or hangers.
9.1.7 Nonmetallic pipe should be hung in accordance with
the manufacturer’s recommendations.
F708 − 92 (2008)
NOTE 1—These hangers are suitable for use in all locations, except tanks, and should be coated with neoprene or other similar material when used to
support nonferrous tubing.
NOTE 2—These hangers are limited to use on tubing with an outside diameter of 1 ⁄8 in. (28.6 mm) or smaller with a system operating temperature
of 180°F (82.2°C) or less.
NOTE 3—Size and quantity of tubes may be varied provided they are arranged so as to be securely clamped.
FIG. 10 Crimp-On Weld Stud Hangers
NOTE 1—These hangers are suitable for use in all locations except tanks.
NOTE 2—These hangers are limited to use on tubing with an outside diameter of ⁄2 in. (12.7 mm) or smaller with a system operating temperature of
180°F (82.2°C) or less.
NOTE 3—Size and quantity of tube may be varied, provided they are arranged so as to be securely clamped.
FIG. 11 Banded Weld Stud Hanger
F708 − 92 (2008)
NOTE 1—These single poly-block hangers are available in Standard Duty and Heavy Duty Series dependent upon application.
NOTE 2—These hangers are suitable for use in all locations, including tanks and areas exposed to the weather. When used in areas subject to high
corrosion, such as salt water ballast tanks or weather decks, stainless steel hanger components shall be used.
NOTE 3—These hangers are limited to use on pipe 8-in. NPS and below and tubing 8-in. outside diameter and below with a system operating
temperature of 300°F (149°C) or less.
NOTE 4—These hangers may be used for multiple pipe installations installed vertically, horizontally, or stacked using a weld plate, weld stud, or
attached to a mounting channel.
FIG. 12 Poly-block Clamp Hangers
TABLE 1 Dimensions
...
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