Metal Pressfitting Pipe Systems

Transcription

1 VdS Guidelines for water extinguishing systems VdS en Requirements and test methods Part 3: Additional provisions for Pipe Systems made of galvanized steel VdS en : (01)

3 VdS en : (01) Part 3: Additional provisions for Pipe Systems made of galvanized steel VdS Guidelines for water extinguishing systems Requirements and test methods Part 3: Additional provisions for Pipe Systems made of galvanized steel Content 0 Noncommittal statement Scope Normative References Amendments to VdS Allowable pressures, sizes and application conditions Material, design, nominal sizes, dimensions Installation instructions Additional provisions for the approval procedure Manufacturing quality of galvanized pipes Inspection of installed pipework made of galvanized pipes... 5 Annex A Allowable pressure, nominal sizes and application conditions... 6 Annex B Order specification, manufacturer s specification (system pipes)... 7 Annex C Order specification, manufacturer s specification (tubes for fitting production)... 8 Annex D Nominal sizes, dimensions and tolerances... 9 Annex E Adapter fittings for connection of non-system components Annex F Manufacturing quality of galvanised pipes

4 Part 3: Additional provisions for Pipe Systems made of galvanized steel VdS en : (01) 0 Noncommittal statement The present VdS Guidelines for water extinguishing systems, Metal Pressfitting Pipe Systems, VdS en, are only binding if their use is agreed in each individual case. 1 Scope This part of VdS contains the material specific amendments to VdS for pipe systems made of galvanized steel. 2 Normative References These Guidelines incorporate, by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to these Guidelines only when incorporated in them by amendment or revision. For undated references the latest edition of the publication referred to applies. VdS CEA 4001 DIN EN DIN EN Guidelines for sprinkler systems Planning and installation Metallic products Types of inspection documents Steel tubes for precision applications Technical delivery conditions Part 3: Welded cold sized tubes DIN EN Continuously hot-dip coated steel flat products Technical delivery conditions DIN EN ISO 8493 Metallic materials Tube Drift-expanding test ISO 7-1 Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation DIN EN 1092 Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated 3 Amendments to VdS Allowable pressures, sizes and application conditions Annex A applies for allowable pressures, sizes and application conditions. 3.2 Material, design, nominal sizes, dimensions Pipes and fittings shall be made from galvanized steel For system pipes, the requirements of Annex B and Annex D apply For tubes for fitting production, the requirements of Annex C and Annex D apply For adapter fittings for connection of non-system components, the requirements of Annex E apply. 4

5 VdS en : (01) Part 3: Additional provisions for Pipe Systems made of galvanized steel 3.3 Installation instructions The installation instructions shall contain additionally description of measures and regulations regarding corrosion protection. 4 Additional provisions for the approval procedure 4.1 Manufacturing quality of galvanized pipes For system pipes and tubes for the fitting production for pipe systems made of galvanized steel, Annex J applies. 4.2 Inspection of installed pipework made of galvanized pipes The approval is generally valid for a period of four years. Prior to an extension of the approval for a pipe system with galvanized steel pipe, a VdS-inspection for signs of corrosion is necessary of at least three installed pipeworks. Note: The purpose of the inspections is to gain experience, on one hand with the material in general and on the other hand with the various approved products. Specific requirements and assessment criteria are not yet defined. These will be developed with increasing experience. 5

6 Part 3: Additional provisions for Pipe Systems made of galvanized steel VdS en : (01) Annex A Allowable pressure, nominal sizes and application conditions Table A.1 Pressfitting pipe systems made of galvanized steel, Allowable pressure, nominal sizes and application conditions Allowable pressure 10 bar to 16 bar Nominal sizes DN 20 to DN 100 Application area (Hazard class) Application area (Pipework) Spacing of the fixings Additives to the extinguishing water according to VdS CEA 4001: Hazard classes LH, OH1, OH2 and OH3 and exhibition halls, cinemas, theatres, concert halls Wet sprinkler systems: horizontal branch pipes and horizontal distribution pipes downstream the alarm valve station (not vertical main and submain distribution pipes) According the provisions of VdS CEA 4001 for copper pipes Not permitted; exception: additives after release of manufacturer and previous agreement with VdS. 6

7 VdS en : (01) Part 3: Additional provisions for Pipe Systems made of galvanized steel Annex B Order specification, manufacturer s specification (system pipes) Table B.1 Pressfitting pipe systems made of galvanized steel, Minimum order requirements for system pipes (continuous galvanized steel; Sendzimir process) - Delivery condition of pipes - welded and rolled to size, +CR1 resp. +CR2 oder +N nach DIN EN Material - E275, , or - E260, , or - E235, , or - E220, , or - E215, , or - E195, , or - E190, Dimensions and tolerances see Annex D - DIN EN Part 3, Table 6 The specified wall thicknesses (T) however not the tolerances may exceed the values given in Annex D. - Surface design - galvanised at inside and outside: surface in accordance with DIN EN design small zinc spangle M, and - improved surface B, and - - Surface finish - μm - End design - on both sides sawn perpendicular to the pipe axis and deburred - Welding process and seam treatment - High frequency pressure welding process with and without afterglow - Outside seam largely even, on the inside welding seam elevation 0,8 mm max. - Corrosion protection of welding seam (outside) - 10 μm Zn or Zn/Al - Yield strength - Specification of yield strength Re (ReH or yield stress Rp0,2 of basic steel material of system pipes) - Marking - according to individual manufacturer s specifications, at least in accordance with the requirements of these guidelines - Evidence in accordance with Annex F - Confirmation of fulfilled order specifications by 3.1 inspection certificate in accordance with DIN EN

8 Part 3: Additional provisions for Pipe Systems made of galvanized steel VdS en : (01) Annex C Order specification, manufacturer s specification (tubes for fitting production) Table C.1 Pressfitting pipe systems made of galvanized steel, Minimum order requirements for tubes for fitting production (Carbon steel; the fittings inside and outside are galvanized subsequently) - Delivery condition of pipes - +N acc. DIN EN and/or DIN EN Material - E275, , or - E260, , or - E235, , or - E220, , or - E215, , or - E195, , or - E190, Dimensions and tolerances see Annex D - DIN EN Part 3, Table 6 The specified wall thicknesses (T) however not the tolerances may exceed the values given in Annex D. - Surface design - blank; galvanizing inside and outside after forming, coating thickness inside 2 μm, coating thickness outside 8 μm - Surface finish - μm - Welding process and seam treatment - High frequency pressure welding process with and without afterglow - Outside: seam largely even, smooth; - Inside: to be smoothed or scoured and free from scratches; - Marking - according to individual manufacturer s specifications, at least in accordance with the requirements of these guidelines - Confirmation of fulfilled order specifications by 3.1 inspection certificate in accordance with DIN EN

9 VdS en : (01) Part 3: Additional provisions for Pipe Systems made of galvanized steel Annex D Nominal sizes, dimensions and tolerances Table D.1 Pressfitting pipe systems made of galvanized steel, Permitted nominal sizes, dimensions and tolerancesen for system pipes and tubes for fitting production Steel pipe dimensions and tolerances acc. DIN EN , clause table 6 Nominal sizes External diameter* Minimum wall thickness DN Inch [mm] [mm] [mm] 20 ¾ ± ± ± ± / ± ± ½ ± ± ± ± ½ ± ± ± ± ± ± 0.20 * Within the permitted range of nominal sizes, additional intermediate external diameters are possible. Note: There shall be sufficient dimensional difference between the sizes of the pipe system, so that a press connection of two different sizes is not possible without being identified as faulty connection purely visually and/or by use of the tools specified in the installation instructions and the specified test method. 9

10 Part 3: Additional provisions for Pipe Systems made of galvanized steel VdS en : (01) Annex E Adapter fittings for connection of non-system components The press part of the adapter fitting shall be designed in accordance with the provisions for pressfittings and thus be made from tubes according to Annex C and Annex D. For material and permitted connections of the adapter fitting part that is designed for the connection of non-system components, table E.1 applies. Table E.1 Pressfitting pipe systems made of galvanized steel, Permitted connections and material for connections to non-system components Permitted connection Permitted material standardized thread connection, preferably acc. ISO 7-1 standardized flange connection, preferably acc. DIN EN 1092 pipe coupling connection (grooved) acc. table E.2, cutting machined Machining steel, galvanized according to Annex C Table E.2 Pressfitting pipe systems made of galvanized steel, Dimensions for cutting machined pipe coupling connections (grooved) Nominal size Nominal outer diameter in mm Outer diameter in mm Pipe length up to groove in mm Groove breadth in mm Diameter at ground of the groove in mm max. min. 0,76 0,76 max. min. DN DN DN DN DN DN DN Note 1: Groove shoulder free of burs with metal removed up to max. 0.3 mm x 45 C. Note 2: Groove ground with radius up to max. 0.8 mm. 10

11 VdS en : (01) Part 3: Additional provisions for Pipe Systems made of galvanized steel Annex F Manufacturing quality of galvanised pipes F.1 General For each charge of system pipes and untreated pipes for fitting production for pipe systems made of galvanised steel, the test according to F.2 and F.3 shall be carried out with at least one sample. The test shall be documented and the approval criteria of F.2 and F.3 shall be fulfilled. F.2 Drift-expanding test The sample is subjected to a drift-expanding test at 23 C ± 5 C with 60 C-punch in accordance with DIN EN ISO The test is documented in a separate test report in accordance with DIN EN ISO 8493, clause 7. Until the expansion is 40 % (up to 1.4 times the diameter) the sample shall show no signs of the zinc layer dismantling from the base material. F.3 Determination of layer thickness The expanded sample of F.2 is split along the pipe axis. Grinding patterns are drawn up. At least four spots of the sample are subjected to a visual metallographic determination of the layer thickness on the basis of the grinding patterns. This determination of the layer thickness is documented in a test report. 11