RJT螺纹标准.pdf

BRITISH STANDARD
BS4825-5:
1991
Stainless steel tubes
and fittings for the food
industry and other
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hygienic applications
Part 5: Specification for recessed ring
joint type couplings
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NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
BS4825-5:1991
Committees responsible for this
British Standard
The prcparation of this British Standard was entrusted by the Piping Systcms
Components Standards Policy Committee (PSE/-)to Tcchnical Commilleo
PSE/8, upon which the following bodies were represented
Tape Ma
British Compressed Air Society
Brilish Gas plc
British Mallcablc Tube Fittings Association
British Steel Industry
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British Valve and Actuator Manufacturers Association
Ibritish Welded Sleel Tube Associalion
Enginccring Equipment and Matcrials Users'association
Food and Drink Federation
Institution of Civil engineers
Inslitution of Gas Engineers
Institution of Water and Environmental Management
Large Diameter Steel Tube Association
Mechanical Handling Engineers Associalion
ONN9∞ooEL
Stainless Stcc Fabwicators' Association of Great Britain
Steel Tube Fittings Manufacturers Technical Association
Water Companies Association
Waler Rescarch Centre
Watcr Scrvices Association of England and Walc
Coopted member
The following bodies were also represented in the drafling of the standard
through subcommittees and panels
Brewers Socicty
Dairy Trade Federation
Institution of Production Engineers
Milking Machine Manufacturers Associalion
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O This British Standard, having
been prepared under the
direction of the Piping Systems
2 Components Standards Policy
a Gomm homily ol e ect on Amendments issued since puz blication
Ls published under
O TE
oard a
nd comes int
d 31 January 1992
①ISI07-199
Comments
relate to the work on this
Committee rofcrcncc PSE/&
Idral't or: comment 88/72923 DC
ISBN0580193659
BS4825-5:1991
Contents
Committees responsible
Iside front cover
foreword
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Information to be supplied by the purchaser
3 efinitions
4 Svmbo
6 Malcrials
7 Dimensions and tolerances
8 Surface finish
g Assembly
10 Hygiene
Appendix A Essential information to be supplied by the purchaser in
the enquiry and/or order
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Appendix B Purchaser options
Appendix C Cross section of coupling assemblies
append
ds for male parts and r
ppendix E Grooves for cxpandcd type malc parts and liners
10
Appendix I! Lock rings for expanded type male parls and liners
Appendix G Guide for expanding with straight tube
Appendix H Fffect of non-metallic products on water quality
15
Appendix d Marking
15
Iigurc 1 -Expanded type malc pa
Iguro
Figure 3-welded type male part
Figure/-welded type liner
Figure 5- Hexagon nut
Figure 6-
Figurc 7-cross scction of expanded type coupling
of welded type coupling
Figure 9 -Male part thread form
Figure 10-nut thread form
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Figure 12- Lock ring
Iigure 13- Positioning of tube and partial expansion of male part
Iigure 11- Inal expansion of' tube onto