Din 11851 Edited Version

 

  DIN 11851:2011-04 Stainless steel fitting for food and chemical industriesScrew pipe connections for expanding and welding

 

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DIN 11851: 2013-02

Content Page Foreword 1 Scope of application 2 Normative 3 Dimensions, designation 3.1 General 3.2 Pipe fittings 3.2.1 Pipe union Pipe screw connection for rolling r olling in Rolling in (W) 3.2.2 Pipe union Pipe union for butt welding Butt welding w elding 3.3 Individual parts 4 Materials 5 Execution 6 Requirements for elastomers 7 Labelling 8 Documentation, Annex A  Notes on rolling pipes according to DIN 11850 in Threaded connector For threaded threaded connector form C and conical connector form Conical socket form D according to DIN D according to DIN 11851 ........................................ 20 Annex B  Notes on the requirements for elastomers.................... elastomers.................... 21 B.1 Approvals / conformities .................... ............................ ........ 21 B.2 Hardness measurement ............................ 21 B.3 Characteristic values ......................... .................................... ........... 21

 

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DIN 11851: 2013-02 Preface This document was adopted by NA 003-01-14 AA "Valves for the food industry" in "Armatures" standards committee (NAA) developed. Attention is drawn to the possibility that some texts in this document may affect patent rights. DIN [and / or DKE] are not responsible for granting any or all of the patent rights in this regard identify. Changes Compared to DIN 11851: 1998-11 and DIN DI N 11887: 1998-11, the following changes have  been made: a) title of the standard changed; c hanged;  b) Section "Material": the steel types X2CrNi18-9 (material number: 1.4307) and X2CrNiMo17X2CrNiMo1712-3 (Material number: 1.4432) have been added; c) the standard has been b een completely revised technically and editorially; d) Table 4, DN 10, dimension n changed from 6 to 7; e) DIN 11887 has been incorporated into the standard; f) Material HNBR has been included in the standard; g) Blind sockets have been included inc luded in the standard. The corrections been made to DIN 2011-04: a) Infollowing table 5, the value “4.5have  0.20” in column “s”11851: also applies to the nomi nominal nal size DN 20. Previous editions DIN Land 851 = DIN 11851: 1936-10 DIN 11851: 1954-03, 1964-01, 1985-07, 1989-05, 1998-11 DIN 11887: 1968-07, 1976-11, 1985-07, 1998-11 DIN 11851-1: 1976-11 DIN 11851-2: 1976-11 DIN 11851: 2011-04

 

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DIN 11851: 2013-02 4th

1 Scope This standard applies to the dimensions, design and materials of pipe p ipe screw connections for nominal widths from DN 10 to DN 100 for rolling in and for nominal sizes DN 10 to DN 150 for butt welding on pipes DIN 11850.

2 Normative references The following cited documents are required for the application of this document. At dated References apply only to the edition e dition cited. For undated references, the last one applies Edition of the referenced document (including any amendments). a mendments). DIN 405-1, general purpose round threads - Part 1: Thread profiles, nominal dimensions  DIN 405-2, round threads of general use - Part 2: Dimensions and tolerances tolerances  DIN 11850, stainless steel pipes for food and chemicals - dimensions, materials  DIN 53505, testing of rubber and elastomers - hardness testing according to Shore A and Shore D   DIN EN 10088-1, Stainless steels - Part 1: List of stainless steels   DIN EN 10088-3, Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars,  Wire rod, drawn wire, profiles and bright steel products made of cor corrosion-resistant rosion-resistant steels for general use

DIN EN 10204, Metallic products - Types of test certificates  DIN EN 10254, drop forgings made of steel - General technical delivery conditions  DIN EN ISO 4288, Geometric  product specification specification (GPS) Surface condition: Profile method - rules and procedures for assessing surface quality DIN ISO 1629, rubber and latices - classification, classification, abbreviations  DIN ISO 2768-1, general tolerances - tolerances for length and angle dimensions without individual  Tolerance DIN ISOentry 13715, technical drawings - workpiece edges with indefinite shape - terms and  Drawing information Code of Federal Regulations, Title 21, Sec. 177.2600, Rubber articles intended for repeated use 1 ) 

3 dimensions, designation 3.1 General All dimensions, unless otherwise indicated, are given in millimeters. General tolerances according to DIN ISO 2768-1 - m. The pipe fittings do not have to correspond to the illustration, only the ones specified Dimensions are to be observed. 1) Available from: Super Intendent of Documents Government Printing Office, Washington DC 28402 (USA).  

Can also be viewed online free of charge.

 

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DIN 11851: 2013-02 3.2 Pipe fittings 3.2.1 Pipe union for rolling in (W)   See table 1 for the parts list, see table 2 for the dimensions of the pipe screw connection.

Fig. 1 - Pipe union for rolling in

Legend a pipe

Designation of a complete pipe for rolling in (W) for diameter = 52 mm and wall thickness = 1 mm; Item No. 1, 2 and 7 made of stainless steel, m material aterial number 1.4301, Item No. 8 made of acrylonitrile butadiene rubber (NBR): Pipe screw connection DIN 11851 - W 52x 1 - 1.4301 – NBR 3.2.2 Pipe union for butt welding 3.2.2.1 Normal version (S)

See table 1 for the parts list, see table 2 for the dimensions of the pipe screw connection.

 

 

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DIN 11851: 2013-02

Fig. 2 - Pipe union for butt welding

Designation of a complete pipe union for butt welding, normal version (S) for Outer diameter = 53 mm and wall thickness = 1.5 mm; Item No. 3, 4 and 7 made of stainless steel, Material number 1.4301, item no.8 made of acrylonitrile butadiene rubber (NBR): ( NBR): Pipe screw connection DIN 11851 - S 53 x 1.5 - 1.4301 – NBR 3.2.2.2 Short version (SK) See table 1 for the parts list, see table 2 for the dimensions of the pipe screw connection

Picture 3 - Pipe screw connectio connection n for butt welding, short

 

 

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DIN 11851: 2013-02 Designation of a complete pipe screw connection for butt welding, short version (SK) for p pipe ipe outside diameter  53 mm and wall thickness  1.5 mm; Item No. 5, 6 and 7 made of stainless steel, Material number 1.4301, item no.8 made of acrylonitrile butadiene rubber (NBR): ( NBR): 

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Pipe screw connection DIN 11851 - SK 53 1.5 - 1.4301 – NBR Table 1 - Parts List !

Item  No. 

Designation 

Shape 

Threaded connector

C

1

Abbreviation for execution 

Comment

the nozzles of nominal size DN 10 to DN 100 by rolling in with the pipe connected

W

2

Conical socket

3 4

Threaded connector Conical socket

D SC SD

S the nozzles of nominal size DN 10

5

Threaded connector

SKC

6

Conical socket

SKD

7

Grooved union nut

F

8

Sealing ring

G

to DN 150 butt welded to the pipe connected

SK

Table 2 - Dimensions of the pipe fitting  Nominal size

Allowable

By-knife

DN 

 pressure Mpa (bar) 

d 8th 

10 15 20 25 32 40 50 65 80 100 125 150

Overall Length W and S l1 

SK l2 

Dimensions in millimeters Corresponding pipe dimensions according to DIN 11850 roll in welding

38 12 x 1 35 44 18 x 1 27 4 54 37 22 x1 (40) 63 45 28 x 1 70 51 34 x 1 31  78 53 40 x 1 92 57 33 52 x1 2.5(25) 112 65 70 x 2 35 127 75 85 x 2 148 89 41 104 x 2 178 70 49 1.6(16) 210 76 56 These pressures in MPa can be used up to 140 ° C if suitable sealing materials a are re used

13 x 1.5 19 x 1.5 23 x 1.5 29 x 1.5 35 x1.5 41 x 1.5 53 x1.5 70 x 2 85 x 2 104 x 2 129 x 2 154 x 2

 

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DIN 11851: 2013-02 3.3 Individual parts The dimensions for the threaded and tapered unions (Form C, D, SC, SD, SKC, and SKD) are given in Table 3 contain. The dimensions for the groove union nut (form ( form F) are given in table 4. The dimensions for the sealing ring (form G) are given in table 5.

Legend a rolling grooves Fig. 4 - Threaded connector form C, Item no. 1 of Fig. 1

Designation of a threaded connector form f orm C for Outer  diameter 52 mm and wall thickness 1 mm out stainless Steel,Material number 1.4301: e

Fig. 5 - conical socket form D, Item no. 2 of Fig. 1

Designation of a conical connection form D for Outer diameter52 mm and wall w all thickness 1 mm made of stainless steel, material number 1.4301:

 

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DIN 11851: 2013-02

Figure 6 - Threaded connector form SC, Item no. 3 of Fig. 2

Designation of a threaded connector form f orm SC With Outer diameter 53 mm and wall wa ll thickness 1.5 mm out stainless Steel, Material number 1.4301: Threaded connector DIN 11851 - SC 53 1.5 - 1.4301 !

Fig. 7 - Conical socket form SD, Item no. 4 of Fig. 2

Designation of a conical connection form SD with Outer diameter 53 mm and wall thickness 1.5 mm made of stainless steel, material number 1.4301: Conical socket DIN 11851 - SD 53 1.5 1.4301 

 

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DIN 11851: 2013-02

Fig. 8 - Threaded connector form SKC, Item no. 5 of Fig. 3 Designation of a threaded connector form f orm SKC with Outer diameter 53 mm and wall wa ll thickness 1.5 mm out stainless Steel, Material number 1.4301:

Fig. 9 - conical socket form SKD, Item no. 6 of Fig. 3   Designation of a conical connection form SD with Outer diameter 53 mm and wall thickness 1.5 mm made of stainless steel, Material number 1.4301:

Threaded connector DIN 11851 - SKC 53 1.5 - 1.4301

Conical 1.4301 socket DIN 11851 – SKD53 1.5 -

!

 

 

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DIN 11851: 2013-02

Fig. 10 - Blind threaded connector form C, DN 50 made of stainless steel, material number 1.4301 Designation one Blind threaded connector Form C, DN 50 out stainless Steel, Material number 1.4301: Blind threaded connector DIN 11851-C-DN 50-1.4301

Fig. 11 - Blind conical socket form D, DN 50 made of stainless steel, material number 1.4301 Designation of a blind conical connection form D, DN 50 made of stainless steel, material number 1.4301: Blind conical socket DIN 11851-D-DN 50-1.4301

 

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DIN 11851: 2013-02 Table 3 - Dimensions of the threaded and tapered connections  Nominal expansion

Associated Pipes after DIN 11850

 

Limit deviating

Dimensions in millime millimeters ters

thread after DIN 405-1

 

 

 

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DIN 11851: 2013-02  Nominal expansion

Associated Pipes after DIN 11850

 

Limit deviating

thread after DIN 405-1

 

 

 

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DIN 11851: 2013-02  Nominal expansion

Associated Pipes after DIN 11850

 

Limit deviating

thread after DIN 405-1

 

 

 

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DIN 11851: 2013-02

Thread undercut can be omitted if the function of the groove union nut is not impaired.  Number of grooves according to table 4 Figure 12 - Grooved union nut form F, Item no. 7 of Fig. 1, Fig. 2 and Fig. 3 Designation of a groove union nut form F, DN 50 made of stainless steel, material number 1.4301: Grooved union nut DIN 11851 - F 50 - 1.4301

 

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DIN 11851: 2013-02 Table 4 - Dimensions of the groove gr oove union nut Dimensions in millimeters  Nominal Size 

Thread after DIN 405-1 

a Tolerance class 7H according to DIN 405-2 

 No of Grooves

Fig. 13 - Sealing ring form G, Item no.G,8 DN of Fig. 1, Fig.of2 acrylonitrile and Fig. 3 butadiene rubber (NBR): Designation of a sealing ring form 50 made Sealing ring DIN 11851 - G 50 - NBR  

 

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DIN 11851: 2013-02 Table 5 - Dimensions of the sealing se aling ring  Dimensions in millimeters  Nominal size DN

4. Materials: For steel grades see table 6

Designation

Blind stubs / threaded stubs / Conical socket / groove union nut

Table 6 - Steel grades Steel grades according to DIN EN 10088-1 and DIN EN 10088-3 Short name Material number 1.4301 X5CrNi18-10 1.4307 X2CrNi18-9 1.4404 X2CrNiMo17-12-2 X2CrNiMo17-12-3

1.4432

The forged blanks must be added for the threaded and tapered nozzles aass well as the groove union nuts DIN EN 10254 or semi-finished products according to DIN EN 10088-3 can be b e used. Abbreviation according to DIN ISO 1629 Sealing ring: elastomers EPDM (ethylene propylene diene rubber) FKM (fluoro rubber) HNBR (hydrogenated acrylonitrile butadiene rubber)  NBR (acrylonitrile butadiene rubber) VMQ (silicone rubber)

5. Execution: Inner surfaces in contact with the product: mean roughness Ra ≤ 0.8 Outside areas: Average roughness Ra ≤ 1.6 The roughness Ra is measured according to DIN EN ISO 4288 on the inner and outer surfaces.

 

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DIN 11851: 2013-02 Workpiece edges to the pipe end according to DIN ISO 13715: Unmeasured workpiece edges must be free of burrs. The manufacturer of the threaded and tapered nozzles with roll-in grooves must ensure that the Design of the grooves leads to a secure hold and tightness of the screw connection parts.

6. Requirements for elastomers :   Elastomers must meet the requirements of the United States Federal Drug Administration

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(FDA)of America, Code of Federal Regulations 21 CFR 177.2600 "rubber articles intended for repeated use",fulfill;   The hardness of the material must be between 65 and 80 units according to Shore A. (Measurement according to DIN 53505); must be carried out so that   Processing operations such as B. the deburring of the seals must under the greatest possible retention of the surface roughness, the sealing contour is not interrupted. The Surface must be closed c losed during visual inspection without enlarging.

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Additional information on the requirements for elastomers can be found in the informative Annex B. want

7. Identification : Items 1 to 7 of the pipe screw connection are to be marked as listed in Table 7.

Melt number (Batch number) 

Table 7 - Identification  Material Pipe connection specification dimensions according (Steel grade)  to tables 2 to 4 or DN  

 Nominal size DN 

DIN 11851 

Threaded connector   Conical   socket  Blind thread connector   Blind cone   connector   Grooved union nut  Empty fields do not have to be labeled 

x

x 

x 

x 

x

x 

x 

x 

x 

x 

x 

Should, for reasons of space, not include the entire scope of the marking on the component must be attached, the contents starting in ascending order can be omitted (DIN 11851, DN, Pipe connection dimensions, material). In any case, for the threaded connector and the conical connector, the Heat number or a clear identification for traceability on the product be.

 

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DIN 11851: 2013-02

8. Documentation, Documentation, certificates : The following documents are for the screw connections or their individual parts, as agreed in the order, to deliver: a) Factory certificate 2.2 according to DIN EN 10204 of the manufacturer;  b) Acceptance test certificate 3.1 according according to DIN EN 10204 for the primary primary material; c) the manufacturer's re-stamping certificate; d) Certificate of conformity for seals in accordance with those listed in Section 6 Conditions

 

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DIN 11851: 2013-02

Appendix A. (informative)  Notes on rolling pipes according to DIN 11850 into threaded connections Form C and conical socket form D according to DIN 11851 A.1 As a precondition for an exact rolling in of the pipes, a burr-free pipe cut surface should be vertical to the pipe axis (use a pipe saw tool if necessary) (see Figure A.1).  

Figure A.1 - clamping device

Figure A.2 - clamping device

Figure A.3 - Pipe roller  

A.2 When inserting the pipe into the roll-in socket, it is essential to ensure that the Pipe is flush with the stop (shoulder) ( shoulder) of the nozzle. The connection should only be tightened in one corresponding clamping device (see Figure A.2).

Legend: a. Pipe  b. Roller c. Threaded connector form C d. Pressure piece e. Axial deep groove ball bearings f. Conical socket form D g. Jig h. Thorn i. The pipe must be flush here  j. The connector must be flush flush here SW wrench size

Figure A.4 - Tensioning process for rolling in

 

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DIN 11851: 2013-02

A.3 In the subsequent rolling-in process with the pipe p ipe roller that matches the nominal diameter d iameter (see Figure A.3) the pipe wall is permanently p ermanently deformed and pressed into the roll grooves. Even turning with slight axial pressure on the mandrel is a prerequisite for pr precise ecise rolling. A.4 In order to prevent the pipe from "bulging out" just behind the n nozzle ozzle when rolling, the The nozzle is flush with the clamping device (see Figure A.4). A.5 The diameter of the pressure piece of the the pipe roller must not exceed the value of d 7 according to this standard step, but should have at least the value of d 6  according to this standard (see Table 3).

 

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DIN 11851: 2013-02

Appendix B. (Informative)  Notes on the requirements requirements for elastomers B.1 Additional approvals : under the responsibility of the user, aadditional Depending on the purpose of the/ conformities overall system and dditional Approvals are checked, for example for:    pharmaceutical applications: USP Class VI (United States States Pharmacopeia);    pharmaceutical applications: according according to EU guideline EMEA EMEA / 410/01, the ingredients should be free of animal ingredients ("free of animal derived ingredients" - "ADI-free"); 

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  Applications in the food industry: XV and XXI plastic recommendation of the BfR (Federal

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Institute for Risk aassessment); ssessment);   Drinking water applications: Worksheet W270 according to DVGW (German Association of Gas and Water compartment e. V.); V .);   Drinking water applications: KTW (plastics in drinking water) recommendation of the Federal Health Office;   Applications in the dairy industry: 3 A Sanitary Sa nitary Standard.

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B.2 Hardness measurement: The measurement is carried out in accordance with the standards on test specimens, additional tests on the finished part or in accordance with DIN ISO 48 are to be agreed. It should be noted that degrees degree s of hardness cannot be compared: For example, has a Elastomer material has a hardness of 75 ! 5 Shore A on the test plate according to DIN 53505, the test of Micro hardness according to DIN ISO 48 on the O-ring results in 70 ! 8 IRHD.

B.3 Further physical parameters : A further limitation of the material to certain colors or abstract physical values (eg minimum values for tension value 100%, tensile strength and elongation at break according to DIN 53504) are not no t recommended. Rather, the suitability for the intended use should be emphasized. It should be noted that the frequently specified maximum operating temperatures in air are valid, but can change significantly depending on the respective operating conditions.