ASTM F708-92(1997)

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An American National Standard
Designation: F 708 – 92 (Reapproved 1997)
Standard Practice for
Design and Installation of Rigid Pipe Hangers
This standard is issued under the fixed designation F 708; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.1.4 standoff—the rigid member that connects the hanger
strap, saddle, or band to the supporting structure. A standoff is
1.1 This practice covers acceptable methods of fabricating
usually made up of one or more pieces of flat bar, pipe, angle
and installing rigid pipe hangers used to support shipboard
bar, or flanged plate to suit a specific location.
piping systems with temperatures of 650°F (343°C) or less.
1.2 This practice provides guidance for the design of hanger
4. List of Pipe Hanger Styles
caps, straps and standoffs, selection of hanger and hanger liner
4.1 This practice incorporates 26 pipe hanger assemblies as
materials, hanger bolting, and hanger spacing.
shown on Figs. 1-12(c) as follows:
1.3 Other hanger designs may be used provided they result
Hanger Fig. No.
in an adequately supported vibration free piping system and are
compatible with the intended system service and temperature
Split cap hanger (single leg standoff) 1(a)
limitations.
Split cap hanger (dual leg standoff) 1(b)
1.4 The values stated in inch-pound units are to be regarded
Split cap hanger (chair type) 1(c)
as the standard. The values given in parentheses are for
Strap hanger 2(a)
information only. Strap hanger (assembled for clearance with rider bar) 2(b)
Strap hanger (assembled for clearance with TFE-fluorocarbon 2(c)
1.5 This standard does not purport to address all of the
strip)
safety concerns, if any, associated with its use. It is the
Welded hanger (flat bar U-type) 3(a)
responsibility of the user of this standard to establish appro-
Welded hanger (round bar U-type) 3(b)
priate safety and health practices and determine the applica-
Welded hanger (square bar U-type) 3(b)
bility of regulatory limitations prior to use.
U-bolt hanger 4(a)
U-bolt hanger (assembled for clearance with rider bar) 4(b)
2. Referenced Documents
U-bolt hanger (assembled for clearance with TFE-fluorocarbon 4(c)
strip)
2.1 ASTM Standards:
Welded hanger (single leg standoff welded direct to pipe) 5(a)
A 307 Specification for Carbon Steel Bolts and Studs,
Welded hanger (dual leg standoff welded direct to pipe) 5(b)
60 000 psi Tensile Strength
“J” band type hanger (insulated pipe) 6(a)
“J” band type hanger (bare pipe) 6(b)
3. Terminology 3
Nelsont hanger 7
Clamp hanger assembled with mounting channel 8
3.1 Definitions:
4,5
Poly-block twin clamp hanger (assembled with welding plate) 9(a)
3.1.1 liner—the material used to isolate a pipe from its
4,5
Poly-block twin clamp hanger (assembled with welding stud) 9(b)
hanger.
4,5
Poly-block twin clamp hanger (assembled with mounting channel) 9(c)
3.1.2 rider bar—a protective strip of material installed
Crimp-on weld stud-type hangers 10
between the pipe and the hanger where frequent linear move-
Banded weld stud-type hanger 11
ment of the pipe is expected.
Poly-block single-clamp hanger (assembled with welding plate) 12(a)
3.1.3 rigid pipe hanger—a device that transfers the load Poly-block single-clamp hanger (assembled with welding stud) 12(b)
Poly-block single-clamp hanger (assembled with mounting channel) 12(c)
imposed by the piping, insulation, and system medium to the
supporting structure.
5. Hanger Designs
5.1 Figs. 1-5 and Fig. 6(a) hangers are designs generally
This practice is under the jurisdiction of ASTM Committee F25 on Ships and manufactured by shipyards or their subcontractors. See also
Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Tables 1-6.
Machinery and Piping Systems.
Current edition approved July 15, 1992. Published September 1992. Originally
published as F 708 – 81. Last previous edition F 708 – 81 (1986).
Annual Book of ASTM Standards, Vol 15.08.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 708 – 92 (1997)
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
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
5.2 Fig. 6, Fig. 8, Fig. 10, and Fig. 11 hangers are commer- 6. Materials and Manufacture
cially available from various vendors. Fig. 8, Fig. 10, and Fig.
6.1 Hanger materials for straps, saddles, and U-bolts for Fig.
11 hangers are primarily designed for use in supporting
1 through Fig. 5 hangers and standoffs should be fabricated
electrical cables, but are suitable for hanging small size pipe
from commercial quality carbon steel. The steel should be a
and tubing.
weldable grade with a minimum tensile strength of 47 ksi (324
5.2.1 The Fig. 7 hanger is a specific design that has been
MPa) and capable of being bent at room temperature through
patented by Nelson Division of TRW.
90° to an inside radius equal to the material thickness without
4,5
5.2.2 The Fig. 9 and Fig. 12 hangers are primarily
cracking on the outside of the bend.
designed for use when supporting multiple runs of pipe or
6.2 Hangers in Fig. 1, Fig. 6, Fig. 7, Fig. 10, and Fig. 11 are
tubing.
generally manufactured from carbon steel. Fig. 8 is furnished
in carbon steel and stainless steel. Fig. 9 and Fig. 12 hanger
Available from TRW Nelson Div., Toledo Ave. and E. 28th St., Lorain, OH clamp halves are injected molded plastic furnished with carbon
44055.
steel or stainless steel hardware.
Available from Stauff Corp., 41 Newman St., Hackensack, NJ 07601.
6.3 Bands and buckles for Fig. 6 and Fig. 11 hangers should
All poly-block hangers are available from Behringer Corp., 108 Jabez St.,
Newark, NJ 07105. be carbon steel electroplated zinc or stainless steel.
F 708 – 92 (1997)
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
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
6.4 Hanger bolts and nuts should be regular series hex type of concentrated loads, such as risers, valves, or groups of
electroplated zinc with unified national coarse threads Class 2 fittings, and to piping configurations that could create rota-
fit per Specification A 307, Grade B. tional forces.
6.5 Table 7 is a listing of hanger liner materials generally
used to isolate the pipe from the hanger (see 9.1.1).
9. General Requirements
9.1 The following general requirements and conditions are
7. Application and Limitations
applicable to all styles of hangers:
7.1 Unless otherwise noted, application and limitations on
9.1.1 Hangers need not be lined unless the hanger and pipe
the use of various style hangers should be as noted with each
are of dissimilar material, or when the system internal operat-
hanger detail.
ing temperature is 300°F (149°C) and over, or 50°F (10°C) and
8. Hanger Spacing
under and the heat transmitted to the other side of the structure
8.1 Table 8 provides general guidance in determining pipe to which the hanger is attached may be objectionable. For
hanger spacing. Special consideration should be given to areas hanger liner materials, see 6.5.
F 708 – 92 (1997)
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
9.1.2 All hanger bolts within tanks or other inaccessible TFE-fluorocarbon wear strip should be used in conjunction
areas shall be secured with lock nuts, lock washers, or by some with a clearance type hanger or other means should be
other means. provided to prevent chaffing of the pipe.
9.1.3 Pipe hangers and standoffs located in areas subject to 9.1.6 Consideration should be given to thermal growth of
corrosion, such as in bilges, ballast tanks, and areas exposed to the piping when selecting or locating hangers so as not to
the weather, should be zinc-plated or blasted and coated with overstress the piping or hangers.
inorganic zinc or coated with the same material as that of the 9.1.7 Nonmetallic pipe should be hung in accordance with
surrounding area. the manufacturers recommendations.
9.1.4 Standoffs fabricated from pipe should not be used
10. Workmanship, Finish, and Appearance
within tanks.
9.1.5 Where thermal growth of piping exceeds 0.100 in. (2.5 10.1 Finished hanger components shall have a workman-
mm) or long runs of pipe are affected by ship flexing such as like appearance and be free of cracks or other injurious defects.
long runs on the weather deck, or long runs in longitudinal Surface scale, rust, welding slag, or any foreign material (such
passageways, a metal rider bar attached to the pipe or a as oil) shall be removed before painting or coating.
F 708 – 92 (1997)
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
F 708 – 92 (1997)
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
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
F 708 – 92 (1997)
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
FIG. 9 Stauff Twin Clamp Hanger
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
F 708 – 92 (1997)
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
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
F 708 – 92 (1997)
TABLE 1 Dimensions for Split Cap Hangers (Fig. 1)
AB C D E F G H J K M
Centerline Size of Standoff
of Centerline Clear- Centerline
Copper Inside
Schedule
Size of Pipe to of ance Bolt Di- of
Nominal Water Diam- Height Length, Size of
80 Nom-
Flat Bar, Centerline Bolt to at Bolts ameter, Bolt to
Flat Bar,
Pipe Tube eter of of Strap, max, Weld,
inal Pipe Angle Bar,
min, of End of (without min, Hanger
A A
min,
Size, in. Size, Strap, in. in. A in.
A A
Size, min, in.
in. Bolt, Strap, liner), in. Leg,
A
A
in.
in. in.
A A A
min,
min, in. in. in.
A
A
in.
in.
3 1 3 3 15 3 5 1 1 1 3 3 1 3 3 1 1
... ⁄8 ⁄8 x ⁄4 ⁄4 ⁄16 ⁄16 ⁄16 ⁄8 ⁄4 ⁄2 6 ⁄1
...