ANSI ASTM F708-1992 Standard Practice for Design and Installation of Rigid Pipe Hangers.pdf

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1、Designation: F708 92 (Reapproved 2014) An American National StandardStandard Practice forDesign and Installation of Rigid Pipe Hangers1This standard is issued under the fixed designation F708; the number immediately following the designation indicates the year of originaladoption or, in the case of

2、revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () 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. Scope1.1 This pract

3、ice covers acceptable methods of fabricatingand installing rigid pipe hangers used to support shipboardpiping systems with temperatures of 650F (343C) or less.1.2 This practice provides guidance for the design of hangercaps, straps and standoffs, selection of hanger and hanger linermaterials, hanger

4、 bolting, and hanger spacing.1.3 Other hanger designs may be used provided they resultin an adequately supported vibration-free piping system andare compatible with the intended system service and tempera-ture limitations.1.4 The values stated in inch-pound units are to be regardedas the standard. T

5、he values given in parentheses are forinformation only.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility

6、 of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A307 Specification for Carbon Steel Bolts, Studs, andThreaded Rod 60 000 PSI Tensile Strength3. Terminology3.1 Definitions:3.1.1 linerthe material used to isolate a pipe from itshanger.3.1.2 rider bara protective stri

7、p of material installedbetween the pipe and the hanger where frequent linear move-ment of the pipe is expected.3.1.3 rigid pipe hangera device that transfers the loadimposed by the piping, insulation, and system medium to thesupporting structure.3.1.4 standoffthe rigid member that connects the hange

8、rstrap, saddle, or band to the supporting structure. A standoff is1This practice is under the jurisdiction of ASTM Committee F25 on Ships andMarine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved Aug. 1, 2014. Published Septe

9、mber 2014. Originallyapproved in 1981. Last previous edition approved in 2008 as F708 92 (2008).DOI: 10.1520/F0708-92R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refe

10、r to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1usually made up of one or more pieces of flat bar, pipe, anglebar, or flanged plate to suit a specific location.4. List of Pip

11、e Hanger Styles4.1 This practice incorporates 26 pipe hanger assemblies asshown on Figs. 1-12(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

12、 rider bar) 2(b)Strap hanger (assembled for clearance with TFE-fluorocarbonstrip)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 fo

13、r clearance with TFE-fluorocarbonstrip)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)Nelson hanger3,47Clamp hanger assembled with mounting ch

14、annel 8Poly-block twin clamp hanger (assembled with welding plate)5,6,49(a)Poly-block twin clamp hanger (assembled with welding stud)5,6,49(b)Poly-block twin clamp hanger (assembled with mountingchannel)5,6,49(c)Crimp-on weld stud-type hangers 10Banded weld stud-type hanger 11Poly-block single-clamp

15、 hanger (assembled with welding plate)4,612(a)Poly-block single-clamp hanger (assembled with welding stud)4,612(b)Poly-block single-clamp hanger (assembled with mountingchannel)4,612(c)5. Hanger Designs5.1 Figs. 1-5 and Fig. 6(a) hangers are designs generallymanufactured by shipyards or their subcon

16、tractors. See alsoTables 1-6.5.2 Fig. 6, Fig. 8, Fig. 10, and Fig. 11 hangers are commer-cially available from various vendors. Fig. 8, Fig. 10, and Fig.11 hangers are primarily designed for use in supportingelectrical cables, but are suitable for hanging small size pipeand tubing.5.2.1 The Fig. 7 h

17、anger3,4is a specific design that has beenpatented by Nelson Division of TRW.5.2.2 The Fig. 9 and Fig. 12 hangers5,6,4are primarilydesigned for use when supporting multiple runs of pipe ortubing.6. Materials and Manufacture6.1 Hanger materials for straps, saddles, and U-bolts forFigs. 1-5 hangers an

18、d standoffs should be fabricated fromcommercial quality carbon steel. The steel should be a weld-able grade with a minimum tensile strength of 47 ksi (324MPa) and capable of being bent at room temperature through90 to an inside radius equal to the material thickness withoutcracking on the outside of

19、 the bend.6.2 Hangers in Fig. 1, Fig. 6, Fig. 7, Fig. 10, and Fig. 11 aregenerally manufactured from carbon steel. Fig. 8 is furnishedin carbon steel and stainless steel. Fig. 9 and Fig. 12 hangerclamp halves are injected molded plastic furnished with carbonsteel or stainless steel hardware.6.3 Band

20、s and buckles for Fig. 6 and Fig. 11 hangers shouldbe carbon steel electroplated zinc or stainless steel.6.4 Hanger bolts and nuts should be regular series hex typeelectroplated zinc with unified national coarse threads Class 2fit in accordance with Specification A307, Grade B.6.5 Table 7 is a listi

21、ng of hanger liner materials generallyused to isolate the pipe from the hanger (see 9.1.1).3The sole source of supply of the apparatus known to the committee at this timeis TRW Nelson Div., Toledo Ave. and E. 28th St., Lorain, OH 44055.4If you are aware of alternative suppliers, please provide this

22、information toASTM International Headquarters. Your comments will receive careful consider-ation at a meeting of the responsible technical committee1, which you may attend.5The sole source of supply of the apparatus known to the committee at this timeis Stauff Corp., 41 Newman St., Hackensack, NJ 07

23、601.6The sole source of supply of the poly-block hangers known to the committee atthis time is Behringer Corp., 108 Jabez St., Newark, NJ 07105.NOTE 1For dimensions of hangers, see Table 1.NOTE 2These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, an

24、d can be used lined or unlined.NOTE 3For Fig. 1(b), length of standoff legs may be unequal and angle of attachment may vary as required to suit conditions.NOTE 4Maximum length of standoff “L” shall be as follows: flat bar = 18 in.; pipe = 30 in.; and angle bar = 42 in.FIG. 1 Split Cap HangersF708 92

25、 (2014)27. Application and Limitations7.1 Unless otherwise noted, application and limitations onthe use of various style hangers should be as noted with eachhanger detail.8. Hanger Spacing8.1 Table 8 provides general guidance in determining pipehanger spacing. Special consideration should be given t

26、o areasof concentrated loads, such as risers, valves, or groups offittings, and to piping configurations that could create rota-tional forces.9. General Requirements9.1 The following general requirements and conditions areapplicable to all styles of hangers:NOTE 1For dimensions of hangers, see Table

27、 2.NOTE 2These hangers are suitable for use in all locations, including tanks and areas exposed to the weather, and can be used lined or unlined.NOTE 3Install standard flat washers as necessary to unlined strap to provide132 to18-in. (0.8 to 3.2-mm) clearance for linear motion of piping whenrequired

28、.FIG. 2 Strap HangersNOTE 1For dimensions of hangers, see Table 3.NOTE 2These 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 3Weld as indicated for size 3-in. NPS and above. For 212-in. NPS and below, wel

29、d hanger on outside only.FIG. 3 Welded HangersF708 92 (2014)39.1.1 Hangers need not be lined unless the hanger and pipeare of dissimilar material, or when the system internal operat-ing temperature is 300F (149C) and over, or 50F (10C) andunder and the heat transmitted to the other side of the struc

30、tureto which the hanger is attached may be objectionable. Forhanger liner materials, see 6.5.9.1.2 All hanger bolts within tanks or other inaccessibleareas shall be secured with lock nuts, lock washers, or by someother means.9.1.3 Pipe hangers and standoffs located in areas subject tocorrosion, such

31、 as in bilges, ballast tanks, and areas exposed tothe weather, should be zinc-plated or blasted and coated withinorganic zinc or coated with the same material as that of thesurrounding area.9.1.4 Standoffs fabricated from pipe should not be usedwithin tanks.9.1.5 Where thermal growth of piping excee

32、ds 0.100 in. (2.5mm) or long runs of pipe are affected by ship flexing, such asNOTE 1For dimensions of hangers, see Table 4.NOTE 2These 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 HangersNOTE 1For

33、dimensions of hangers, see Table 5.NOTE 2These hangers are limited to use on normally dry ferrous piping systems, such as sounding tubes. Air escapes and plumbing drains with awall thickness of 0.200 in. (5.1 mm) or more.NOTE 3These hangers should not be used where takedown is required or in the ste

34、ering gear room, inner bottoms, fore peak, aft peak or deep tanks,or other high vibration or inaccessible areas.NOTE 4For Fig. 5(b), length of standoff legs may be unequal and angle of attachment may vary as required to suit conditions.FIG. 5 Welded HangersF708 92 (2014)4long runs on the weather dec

35、k, or long runs in longitudinal passageways, a metal rider bar attached to the pipe or aNOTE 1For dimensions of hangers, see Table 6.NOTE 2These 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 HangersNO

36、TE 1This hanger is suitable for use in all locations except tanks.NOTE 2This hanger is limited to use on pipe 4-in. NPS and below with a system operating temperature of 200F (93.3C) or less.FIG. 7 Nelson HangerF708 92 (2014)5TFE-fluorocarbon wear strip should be used in conjunctionwith a clearance t

37、ype hanger, or other means should beprovided to prevent chaffing of the pipe.9.1.6 Consideration should be given to thermal growth ofthe piping when selecting or locating hangers so as not tooverstress the piping or hangers.9.1.7 Nonmetallic pipe should be hung in accordance withthe manufacturers re

38、commendations.10. Workmanship, Finish, and Appearance10.1 Finished hanger components shall have a workman-like appearance and be free of cracks or other injurious defects.Surface scale, rust, welding slag, or any foreign material (suchas oil) shall be removed before painting or coating.NOTE 1These h

39、angers are suitable for use in all locations, including tanks and areas exposed to the weather. When used in areas subject to highcorrosion, such as salt water ballast tanks or weather decks, stainless steel hanger components shall be used.NOTE 2These hangers are suitable for supporting single or mu

40、ltiple runs of piping 2 in. (50.8 mm) or smaller.FIG. 8 Clamp Hanger Assembled with Mounting ChannelNOTE 1These hangers are suitable for use in all locations, including tanks and areas exposed to the weather. When used in areas subject to highcorrosion, such as salt water ballast tanks or weather de

41、cks, stainless steel hanger components shall be used.NOTE 2These hangers are limited to use on pipe 114-in. NPS and below and tubing 112-in. outside diameter and below with a system operatingtemperature of 300F (149C) or less.NOTE 3These hangers may be used for multiple pipe installations installed

42、vertically, horizontally, or stacked using a welding plate, welding stud,or attached to a mounting channel.FIG. 9 Stauff Twin Clamp Hanger4, 5, 6F708 92 (2014)6NOTE 1These hangers are suitable for use in all locations, except tanks, and should be coated with neoprene or other similar material when u

43、sed tosupport nonferrous tubing.NOTE 2These hangers are limited to use on tubing with an outside diameter of 118 in. (28.6 mm) or smaller with a system operating temperatureof 180F (82.2C) or less.NOTE 3Size and quantity of tubes may be varied provided they are arranged so as to be securely clamped.

44、FIG. 10 Crimp-On Weld Stud HangersNOTE 1These hangers are suitable for use in all locations except tanks.NOTE 2These hangers are limited to use on tubing with an outside diameter of12 in. (12.7 mm) or smaller with a system operating temperature of180F (82.2C) or less.NOTE 3Size and quantity of tube

45、may be varied, provided they are arranged so as to be securely clamped.FIG. 11 Banded Weld Stud HangerF708 92 (2014)7NOTE 1These single poly-block hangers are available in Standard Duty and Heavy Duty Series dependent upon application.NOTE 2These hangers are suitable for use in all locations, includ

46、ing tanks and areas exposed to the weather. When used in areas subject to highcorrosion, such as salt water ballast tanks or weather decks, stainless steel hanger components shall be used.NOTE 3These hangers are limited to use on pipe 8-in. NPS and below and tubing 8-in. outside diameter and below w

47、ith a system operatingtemperature of 300F (149C) or less.NOTE 4These hangers may be used for multiple pipe installations installed vertically, horizontally, or stacked using a weld plate, weld stud, orattached to a mounting channel.FIG. 12 Poly-block Clamp HangersTABLE 1 Dimensions for Split Cap Han

48、gers (Fig. 1)ABCDEFGHJ K MNominalPipeSize, in.CopperWaterTubeSize,in.Size ofFlat Bar,min,in.AInsideDiam-eter ofStrap,in.ACenterlineofPipe toCenterlineofBolt,min,in.AHeightof Strap,in.ACenterlineofBolt toEnd ofStrap,in.AClear-anceat Bolts(withoutliner),in.ABolt Di-ameter,min,in.ACenterlineofBolt toHa

49、ngerLeg,in.ALength,max,in.Size of StandoffSize ofWeld,in.AFlat Bar,min,in.ASchedule80 Nom-inal PipeSize,min,in.AAngle Bar,min, in.A.3818 34341516316516181412 6316 341234 34 181814 .18 34131615161364516181412 6316 341234 34 1818.1218 3478 114516181412 6316 341234 34 181838 .18 341516 1932516181412 6316 341234 34 1818.5818 34 11116516516181412 6316 341234 34 181812 .18 34 118 1182364516181412 6316 3