1、NOTE: MIL-STD-1627 has been redesignated as a Design Criteria Standard. Thecover page has been changed for Administrative reasons. There are no otherchanges to this Document.MIL-STD-1627C (SH)30 SEPTEMBER 1994_SUPERSEDINGMIL-STD-1627B (SH)2 SEPTEMBER 1981(See 6.6)AMSC N/A FSC 4710DISTRIBUTION STATEM
2、ENT A. Approved for public release; distribution isunlimited.INCH-POUNDDEPARTMENT OF DEFENSEDESIGN CRITERIABENDING OF PIPE OR TUBEFOR SHIP PIPING SYSTEMSProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-MIL-STD-1627C(SH)FOREWOIU)t:, .:., 1. This Military
3、 Standard is approved for use by the Naval Sea SystemsCommand, Depar-nt of the Navy, and is available for use by all Departments andAgencies of the Department of Defense.2. Beneficial comments (recommendations,additions, deletions) and anypertinent data which may be of use in improving this document
4、 should be addressedto: Commander, Naval Sea Systems Command, SEA 03R42, 2531 Jefferson Davis Hwy,Arlington, VA 22242-5160 by using the self-addressed Standardization DocumentImprovement Proposal (DD Form 1426) appearing at the end of this document or byletter. 3, This standard covers fabrication re
5、quirements and acceptance criteria forpipe bending.4. For Naval activities, this document may be invoked upon receipt.5. For contracts or acquisition orders which invoke NIL-STD-1627A(SH),MIL-STD-1627B or NAVSHIPS 250-582, the contractor or vendor shall not use thisstandard without prior contractual
6、 approval.iiProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-MXL-STD-1627C(SH)-,.-I.IV,- :. $.:.-.Paragraph 1.1.12.2.12.1.12.22.33.3.13.1.13.23.33.43.4,13.4.23.4.33.4.43.4.53.53.63.73.83.93.103.113.123.133.143.153.163.174.4.1.4s1,14.1.24.1.34.1.44.24.2.
7、14.34.44.55.5.15.2SCOPE ”-.”.”o”o.”.oScope ”APPLICABLE DOCUMENTS .Government documents Specifications, standards, andhandbooks Non-Government publications ,Order of precedence .DEFINITIONS o.”.”-”ooo”oActivity ”.“”Authorized representative .Backwall .”s”.”6”Bend radius .”Bending machines .-.”Bending
8、 machine -Ram tyPe .“Bending machine -Roll we ”Bending machine - Compression type Bending machine -RotarY type ”.”.Bending machine - Rotary type with a booster Buckles and bulges Cold bending .”.”-Crack .Dent ”sFlatness ”o”,Gouge Hot bending .”.”Hump o,.”o.o”“”liinimumdesign wall thichess .Pipe Qual
9、ified .Step ”.”Wrinkles “.GENERAL REQUIRME.NTS .Material Do”.”Base material condition. Base material cleanliness .Wall thickness ”Surface condition .s.”.Lubricants .”Unacceptable lubricant ingredients Cleaning “”Loose fillers -.”.Material contro .”DETAILEDBendingBendingREQUIREMENTS -oo-.-procedures
10、procedure qualification .iii1111122223333333444444444444455555555569999910Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-MIL-STD-1627C(SH)CONTENTS - ContinuedParagraph 5.2.15.2.25.2,35.2.45.2.55.2.65.2.75.35.3.15.3.25.3.35.45.4.15.4.25.4.35.4.45.55.5.
11、15.5.1.15.5.25.65.6.15.6.25.6.35.6.45.75.7.15.7.25.7.35.85.8.15.8.25.8.35.95.9.15.9.1.15.9.1.25.9.1.35.9.1.45.9.1.55.9.25.9.2.15.9.2.2Production bends as qualification test .Bending machine qualification Alternative procedures .Qualification test approval Previously qualified procedures Vendor quali
12、fication .Transferal of qualification .Qualification test .Sampling .Special requirements .Qualification bends Bending criteria .Minimum bend radius Bending of longitudinallywelded pipe Marking Bending temperatures .Hot bending !0Heating of pipes .Torch heating Temperature measurements during heatin
13、g andbending .Adjustments and corrections Bend angle adjustment in the closing direction .Bend angle adjustment in the opening direction .Reverse bending Corrections for out-of-round, buckles, bulges,and dents .Post bending heat treatment General Cleaning prior to heat treatment .Procedure Inspectio
14、n .Inspection procedures Sampling .Inspection personnel .Acceptance standards .Surface conditions .Cracks .Pits, gouges, scratches and tool marks .Wrinkles .Buckles, bulges, humps, steps and dents Flatness .Dimensional Out-of-roundness .Wall thickness measurement .10101010101010111111111111111111121
15、212131313131313131313131414151515151515151515151616ivProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-MIL-STD-1627C(SH)Paragraph 6.6.16.26.36.46,56,6Figure 1. “2.3.4.I.11.111,IV.NOTES 0,00.*oo*s”Intended use .o+Acquisition requirements a71 *Obsolete spe
16、cifications referenced by this standard.Maintenance of records .Subject term (keyword) listing .!Changes from previoUsissw FIGURESTypes of bending machines Location of weld for welded pipe .calculations for buckles, bulges, humps, steps,and dents in pipe ben.; . 4: : . . . .1.1 $CODC. This standard
17、covers pipe bending, heat treatment, andinspection requirements and acceptance criteria for piping used for ships of theUnited States Navy. The standard applies to pipes of 1/4 nominal pipe size (rips)and larger or tubes with 1/2 inch outside diameter (od) and larger,2. APPLICABLE DOCUMENTS .2.1 gov
18、ernment doc.2.1.1 $Decfic tions. stantir S.a d and handbo . The following specifi-cations, standards, and handbooks form a part of this document to the extentspecified herein. Unless otherwise specified, the Issues of these documents arethose listed in the issue of the Department of Defense Index of
19、 Specifications andStandards (DODISS) and supplement thereto, cited in the solicitation (see 6.2).SPECIFICATIONSFEDERALQQ-N-281/3MILITARYMIL-T-15005HIL-T-16286MIL-T-16420MIL-T-23226MIL-T-23227MIL-T-23520MIL-T-24107MIL-P-24338t41L-P-24691/lMIL-P-24691/2MIL-P-24691/3STANDARDSMILITARY.-.-.MIL-STD-271 -
20、MIL-STD-278 -Nickel-Copper Alloy, Tube and Pipe, Seamless.Tubes, Condenser and Heat Exchanger, Copper-NickelAlloys (UNS C70600 wrotating bending die, clamping block, wiper die and sliding or stationarypresstiedie aB Bhown on figure ld. The clamping block holds the end of the pipe to thebending die w
21、ith sufficient force to keep it from moving while it is being bentaround the die. The bending die rotate8 around a pivot and pulls or draws thepipe around it. The bending die also supports the inner half or throat of thepipe bend. The pressure die presses the pipe into the groove of the bending die.
22、The pressure die also supports the outer half or heel of the pipe bend. Thepressure die may be stationary or slide with the pipe. The wiper die isstationary and opposite the pressure dies. The wiper die supports the inner halfof the pipe and keeps the pipe throat from wrinkling. The maximum angle of
23、 bendis 180 degrees.3.4.5 endi - Rotary twe With a booster. This machine isessentially the rotary -e bending machine with the force being applied to thestraight end of the pipe. This force reduces the pull on the pipe to bend itaround the bending die as shown on figure le. Booster unit enables small
24、er radiusbends to be made on the pipe.3.5 Buckles and bul, A wavy condition which may form on the pipe throatsurface during the bending operation.3.6hardening3.73.83.93.10Cold bending. The bending of pipe at any temperature at which strainoccurs. A crevice, fissure, rupture, or fracture of the pipe
25、surface.w. A depression in the contour of the pipe surface.Flatness. An area on the pipe surface having no curvature.M!%. A groove, cavity, or scooped out area on the pipe surfaceproduced by a sharp object or abrasive.3.11 ot bend. The bending of pipe at a temperature at which strainhardening does n
26、ot occur (see table II).3.12 -. A rounded protrusion or bulge on the backwall or heel of thepipe bend caused by the improper placement of the bending mandrel.3.13 Minimum des w . The wall thickness specified on thefabrication drawing or computed in accordance with the applicable shipbuildingspecific
27、ation as the minimum acceptable for the temperature and pressure applica-tion, whichever is greater,3.14 . The term “pipe” as used herein shall include both pipe andtuben, in accordance with the nomenclature set forth by the materialspecification,3.15 Oualified. The item under consideration has been
28、 approved as requiredby this standard.4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-. . . . . . . . .MIL-STD-1627C(SHj “”-“”“. . -, 3;16 $rfiyi=gAAtiudb6X-cexie; on:the-throatof a pipe bend caused bythe lack of, or improper spacing of the wiper die
29、during the bending operation.3.17 . Definite folds, or creases, formed on the surface of thepipe during bending operations,4. GENERAL REQUIREMENTS4.1 eria. Base material shall conform to the applicable contract,shipbuilding or equipment specifications. A list of generally used pipina ortubing materi
30、als, arranged in groups in accordance wfth similarities in bending,are given in table I.4.1.1 Pase material condition. Prior to bending, the base material in thevicinity of the bend shall be in the following conditions. The pipe is usuallyprocured to these conditions and provided no cold work has be
31、en performed on them,no additional heat treatments are required.M terial rou (see table 1 Conditions-1 Stress relieved, annealed,normalized, or normalizedand tempered.s-3, s-4, s-5 Annealed, normalized and tempered,or quenched and tempered.S-8, S-21, S-22, S-31, Annealed.S-32, S-34, S-42, S-434.1.2
32、Base material cleanliness. Prior to bending, the pipe surfaces,inside and outside, shall be clean and free of foreign matter which may result innicks and gouge marks on the bent pipe surface.4.1.3 Wall thickness. Pipe selected for bending shall have sufficient wallthickness to assure that the backwa
33、ll of the finished bend meets the minimumdesign thickness (Tin)or the minimum specified thickness.4.1.4 face condition. The surfaces to be bent shall have neither dents,nicks, nor gouges in excess of that permitted by this standard (see 5.9.1).4.2 Lubricants, Lubricants may be used In bending operat
34、ions to preventgalling of the pipe material during bending and to prevent rapid wear of the die.Lubricants shall be easy to remove after bending and shall not stain the pipe. Alubricant that works effectively on one pipe material may not be effective foranother. Mineral oils and organic fats, such a
35、s lanolin, are commonly usedlubricants. Examples of acceptable lubricants are lanolin, lard oil, viscous oilsand soap solutions. Lubricant shall have good surface adhesion and film strengthat bending temperatures.Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
36、om IHS-,- -. . . .- .- . . . . -F.-.HIL-STD-Z627C(SH)4.2.1 cce 1 . Use of lubricantscontaining thefollowingingredients are not permitted:(a) Qzona depleting lubricants not meeting local volatile compound(VOC) requirements shall not be used.(b) Lubricants containing sulfur or chlorine shall not be us
37、ed on groupS-8, S-31, S-32, S-34, S-42, and S-43 materials.(c) Carbonaceous lubricants shall not be used on group S-8 materials.(d) Iabricants containing halogens, arsenic, bismuth, copper,phosphorus, sulfur, tin, lead, cadmium or zinc in excess of 250parts per million (ppm) total halides or 250 ppm
38、 of each otherindividual element shall not be used on material intended forsemice at temperatures greater than 400 degrees Fahrenheit (“F).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-MIL-STD-1627C(SH)ApplicabledocumentsSroupnumber Form and grade or
39、 classMaterialPipe, all gradesCarbon steel s-1 ASTM A 53MIL-T-16286 Tube, classes A opper S-31 MIL-T-24107 I Tube, copperS-32 I MIL-T-20168 I Pipe, alloy C230003rass, I AsTn B43 I Pipe, alloy C23000S-34 I KIL-T-15005 I Tube, alloy C7060010/10Copper-nickelI ASTM B 111 I Tube, alloy C70600I MIL-T-1642
40、0 I Tube, alloy C70600;-34 MIL-T-15005 Tube, alloy C71500ASTM B 111 Tube, alloy C715000/30Copper-nickelI MIL-T-16420 I Tube, alloy C71500;-42 I MIL-T-1368 I Tube -43 MIL-T-23227 Tube Piping componeritsandassemblies of components shall bethoroughly cleaned after fabrication and before installation in
41、 the ship to removeloose particles, grease, dirt, oil, rust, and scale.4.4 ose fi Loose fillers, such as silica sand and approved lowmelting material (such as rosin) may be employed for internal support whenmandrels are not available or practicable. Low melting rosin, melting attemperatures not to e
42、xceed 400 degrees F, shall be used for bending at ambienttemperature. Removal of rosin by direct torch heating shall be limited to 400degrees F. Silica sand used for high temperature bending shall be dry. The sandshould be 912 minimum silica, containing no nonferrous contaminants and having afinenes
43、s sufficient to yield a surface which meets specification requirements.Sand previously used in nonferrous pipes shall not be used in ferrous pipes andvice versa.4.5 flaterialconti The following material controls shall be required:(a)(b).(c)For corrosion resistant steel pipes: The silica sand used sh
44、all beclean and dry, and shall not be used for purposes other thanfilling corrosion resistant steel pipes. Hand tools that cow incontact with the corrosion resistant steel pipe shall be eithercorrosion resistant steel or rust free ferrous tool steel and shallnot be used on material other than corros
45、ion resistant steel.Resin shall not be used for pipe filling.For carbon and alloy steel pipes: The silica sand shall be cleanand dry and shall not be used for purposes other than fillingferrous pipes. Resin shall not be used for pipe filling,Galvanized parts, bronze or lead tools shall not be used o
46、r come incontact with the pipe.Nonferrous pipes: The silica sand shall be clean and dry and shallnot be used for purposes other than filling nonferrous pipes.Galvanized parts or lead tools shall not come in contact with thepipe.5. DETAILED REQUIREMENTS5.1 . Prior to performing production bending, ea
47、chactivity shall prepare detailed written bending procedures. Bending proceduresshall be based on the requirements and acceptance criteria of this standard andshall include the following (see 6.2):(a) Base material type, pipe size and wall thickness.(b) Pre-bending preparations (see 4.1).(c) Bend ra
48、dius.(d) Bending temperature (hot or cold).(e) Type of bending machine (see 5.2.2).(f) Type of lubricant, if any used (see 4.2).(g) Bend angle adjustment where applicable.(h) Out-of-round and buckling repair.(i) Post bending heat treatment, if any.(j) Post bending cleaning requirements.(k) Inspection requirements and acceptance criteria.9Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-“-“-“-“-“-“-“-“-XIL-J-sTD-iGt7c-(5ti“-“-“-“- -=
