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_
SUPERSEDING MIL-STD-1627B (SH)
2 SEPTEMBER 1981 (See 6.6)
AMSC N/A FSC 4710
DISTRIBUTION STATEMENT A. Approved for public release; distribution isunlimited.
INCH-POUND
DEPARTMENT OF DEFENSEDESIGN CRITERIA
BENDING OF PIPE OR TUBEFOR SHIP PIPING SYSTEMS
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MIL-STD-1627C(SH)
FOREWOIU)t:, .:., ....
1. This Military 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 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 requirements 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 approval.
ii
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MXL-STD-1627C(SH)
-,.-I.IV,---- :. $.:.-.
Paragraph 1.1.1
2.2.12.1.12.22.3
3.3.13.1.13.23.33.43.4,13.4.23.4.33.4.43.4.53.53.63.73.83.93.103.113.123.133.143.153.163.17
4.4.1.4s1,14.1.24.1.34.1.44.24.2.14.34.44.5
5.5.15.2
SCOPE ..................................-..oo..oScope ..........................................
APPLICABLE DOCUMENTS .................................Government documents ................................Specifications, standards, andhandbooks ............Non-Government publications ..,......................Order of precedence .................................
DEFINITIONS ............................o..--ooooActivity .......................................Authorized representative ...........................Backwall ...............................s.6Bend radius .................................Bending machines .............................-.....Bending 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 ................................................Qualified ...........................................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~ .................................
DETAILEDBendingBending
REQUIREMENTS ..........................-oo-.-procedures ..................................procedure qualification .....................
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1
1
11122
223333333444444444444455
55555556999
9910
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MIL-STD-1627C(SH)
CONTENTS - Continued
Paragraph 5.2.15.2.25.2,35.2.45.2.55.2.65.2.75.35.3.15.3.25.3.35.45.4.15.4.25.4.35.4.45.55.5.15.5.1.15.5.2
5.65.6.15.6.25.6.35.6.4
5.75.7.15.7.25.7.35.85.8.15.8.25.8.35.95.9.15.9.1.15.9.1.25.9.1.35.9.1.45.9.1.55.9.25.9.2.15.9.2.2
Production bends as qualification test .............Bending machine qualification ......................Alternative procedures .............................Qualification test approval ........................Previously qualified procedures ....................Vendor qualification ...............................Transferal of qualification .......................Qualification test .................................Sampling ...........................................Special requirements ...............................Qualification bends ................................Bending criteria ...................................Minimum bend radius ................................Bending of longitudinally welded pipe ..............Marking ............................................Bending temperatures ...............................Hot bending ..........................!0............Heating of pipes ...................................Torch heating ......................................Temperature measurements during heating 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 ..........................................Inspection .........................................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 .........................
10101010101010111111111111111111121212
1313131313
13131313131414151515151515151515151616
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MIL-STD-1627C(SH)
Paragraph 6.6.16.26.36.46,56,6
Figure 1. 2.3.
4.
I.11.111,IV.
NOTES ..................................0,00...*oo*sIntended use ...................................o..+Acquisition requirements ........................ **Obsolete specifications referenced by this standard.Maintenance of records .............................Subject term (key word) listing .................!..Changes from previoUsissw ........................
FIGURES
Types of bending machines ..........................Location of weld for welded pipe ...................calculations for buckles, bulges, humps, steps,and dents in pipe ben& ...........................Flatness limits ....................$...............
TABLES
Grouping of base material ..........................Cold and hot bending temperatures ..................Post bending heat treatment ........................Post bending heat treatment temperaturesand mode of cooling. ..............................
16161617171717
1819
2021
71214
14
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MXL-STD-1627C(SH)
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1.1 $CODC. This standard 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 government doc~.
2.1.1 $Dec~fic 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 Specifications andStandards (DODISS) and supplement thereto, cited in the
