Metal Pressfitting Pipe Systems

Transcription

1 VdS Guidelines for water extinguishing systems VdS en Requirements and test methods VdS en : (01)

2 Publishing house: VdS Schadenverhütung GmbH Amsterdamer Str Köln, Germany Phone: ; Fax: Copyright by VdS Schadenverhütung GmbH. All rights reserved.

3 VdS en : (01) VdS Guidelines for water extinguishing systems Requirements and test methods Content 0 Noncommittal statement Scope Normative References Definitions Regulations for the approval procedure Order Manufacturing sites according to VdS 2344 and VdS Requirements Specifications Technical documentation Marking Material and design Nominal sizes, dimensions and tolerances Performance characteristics Tests Test conditions and test samples Pre-Test and identification Assembly of the test connection Test of the mechanical strength Flame test Resistance to temperature test Torsion test Stress corrosion test Pressure loss test on fittings for sprinkler support Vacuum test Marking durability test Other tests Annex A Order specification, sealing element Annex B Test device for pipe systems Annex C Example test schedule

4 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 1.1 These guidelines specify, together with the material specific further parts of VdS , requirements and test methods for non-detachable pressfitting pipe systems for pipework and pilot lines of fixed water extinguishing systems e.g. in accordance with VdS CEA Moreover, these guidelines define regulations for the approval procedure of pressfitting pipe systems applicable in addition to the procedure guidelines VdS 2344 and VdS These Guidelines are applicable for pressfitting pipe systems made of materials as specified in the material specific further parts of VdS ; for allowable pressure, nominal sizes and application conditions in accordance with the material-specific further parts of VdS ; whose connections are sealed by means of elastic sealing elements (O-rings); whose fittings are made of tubes. 1.3 Moreover, these guidelines can serve as a guide for the testing of congeneric pipe systems. 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 Guidelines for sprinkler systems Planning and installation Metallic products Types of inspection documents 3 Definitions Pressfitting Pipe System: System for setting up pipework consisting of pressfittings, system pipes, sealing elements and pressing tools with system-specific description of use and assembly including fixing. Allowable pressure: Pressure specified by the applicant for which the test shall be carried out. The test pressures are calculated based on this value. At the same time it is the upper limit for the use of the VdS-approved pipe system. 4

5 VdS en : (01) 4 Regulations for the approval procedure 4.2 Order In addition to VdS 2344 and VdS 2481 the following regulations apply: Orders for testing and/or approval shall refer to complete pipe systems. Orders for testing and/or approval may only be submitted by system suppliers distributing all the system components. 4.2 Manufacturing sites according to VdS 2344 and VdS 2841 The following production steps shall be carried out by manufacturing sites according to VdS 2344 and VdS 2841: fitting production; purchasing or production of system pipes (as applicable in the individual case); purchasing or production of sealing elements (as applicable in the individual case). 5 Requirements 5.1 Specifications The applicant shall specify the allowable pressure and, if applicable, details on the application area in compliance with the material specific further parts of VdS Technical documentation The following documents are required: a) List of documents (with own designation, drawing number, revision state, date) containing all documents specified below (each with designation and drawing number as well as revision state and date). b) List of manufacturing sites and their suppliers with: Manufacturing site(s) of the fittings and their suppliers of tubes for the fitting production; Manufacturing site(s) of the system pipes and, in case the system pipes are purchased prefabricated, the suppliers Manufacturing site(s) of the sealing elements and, in case the sealing elements are purchased prefabricated, the suppliers. c) Manufacturing documents: Assembly drawings and/or detail drawings of the fittings (as applicable); The marking according to 5.3 must be documented in the drawings. The meaning of coded markings on the fittings must be documented in the drawings. Order specification or manufacturer specification for tubes for the fitting production according to the material specific further parts of VdS ; 5

6 VdS en : (01) Order specification or manufacturer specification for system pipes for the fitting production according to the material specific further parts of VdS ; Order specification or manufacturer specification for sealing elements according to Annex A; Order specification or manufacturer specification for pressing tool(s). d) Installation instruction for the use of the pipe system in fixed water extinguishing systems containing all relevant details for the installer/user and specifiying at least the following information: Description and dimensions of the system pipes, fittings and sealing elements; Specification of all pincers and tools designed for the pressing; Description of the use and the application limits including following details: The specifications according to 5.1; Specification of the application conditions according to the material specific further parts of VdS ; Specification of the equivalent pipe lengths of the fittings (table); Requirements for shipment and storage; Description of the spacing of the fixings in accordance with VdS CEA 4001 or less; Reference to VdS CEA 4001; Description of the pipe ends; Way and sequence of assembly; Description of the measure for checking the insertion depth on the completed installation; Description of the requirements for connection to other systems/mixed installations; Description of use and the application limits for the use in sprinkler systems according to VdS CEA 4001: Reference note that the requirements of VdS CEA 4001 apply when used in sprinkler systems; Reference note that the requirements and remarks in the respective VdS- Approval have to be observed; Description of the application area according to the material specific further parts of VdS ; Description of the spacing of the fixings; Reference note that the commissioning shall done according to VdS CEA 4001, section ; Reference note that no additives may be used in the extinguishing water (exception: additives after release of manufacturer and previous agreement with VdS). 6

7 VdS en : (01) 5.3 Marking System pipes, fittings and sealing elements for different pressures or application conditions shall be distinguishable by different form, colour or marking. Furthermore, they shall be marked as follows: Table 1: Marking of system pipes, fittings and sealing elements Sealing element (only if sealing element is delivered and packed separately from the fitting) Fitting System pipe - Name or trade mark of the system supplier A A B - Nominal size (DN xxx) or (DN xxx / xxx,x mm) or comparable A A* B - Wall thickness (x,x mm) A - Type designation of the system A A B - Article designation or specification B B - Article designation(s) where the sealing element is used B - Marking according VdS 2344 as VdS-approved A A B - VdS Approval number (G4xxxxx) A B B - directly following: allowable pressure in xx.x bar A B - Markings or codes (see also 5.2 b), which allow conclusions on: - manufacturing date, -period or -batch A B - manufacturing site (if not identical to system supplier) A B - Manufacturing process if the single part is produced parallel with several manufacturing processes/manufacturing techniques or the manufacturing process/manufacturing technique is changed - Material, if single part is produced parallel with several materials/material mixtures or material/material mixture is changed A = marking on the component B = marking on the component or packaging or accompanying documents A A B B * = the indication of the nominal size on the fitting may be reduced to the indication of the pipe outer diameter (xxx), if it is completely available on the system pipe - (DN xxx / xxx,x X x,x mm) or comparable. Example for system pipe: (name) DN 50 / 54 x 1,5 mm (type) VdS G4xxxxx 16 bar (manufacturing code) Example for fitting: (name) 54 (type) VdS Markings on the component must be non-detachable, non-flammable, permanent and well legible in mounting position. Note: A marking by means of adhesive foil or similar measures is not acceptable. Markings on system pipes and fittings by means of inc, paint or comparable shall remain well legible when tested in accordance with Material and design The provisions of the material specific further parts of VdS do apply for 7

8 VdS en : (01) material and design of the system pipes; material and design of the tubes for fitting production; material and design of press-fittings with threaded, flanged and grooved connection. 5.5 Nominal sizes, dimensions and tolerances The provisions of the material specific further parts of VdS do apply for Nominal sizes, dimensions and tolerances of the system pipes; Nominal sizes, dimensions and tolerances of the tubes for fitting productionn. 5.6 Performance characteristics The pipe system shall be tested according to section 6 and shall fulfill the requirements described there. According to the material specific further parts of VdS individual requirements and tests may be not applicable dependent on material and/or application area. 6 Tests 6.1 Test conditions and test samples Test conditions The tests are conducted at a temperature of (25 ± 10) C unless otherwise specified for a specific test. The tolerance of all test parameters is ± 5 % unless specified otherwise Test modules and test samples Test modules (tests and test sequence for one test sample each) are determined for the test of pipe systems according to table 2. If several materials, material combinations and/or pressing techniques or pressing tools are commissioned for testing, all tests except for the flame test (section 6.5) and temperature resistance test (section 6.6) are conducted for each material or each combination. The flame test (section 6.5) and the temperature resistance test (section 6.6) are conducted for each sealing element, irrespective of different pressing techniques and material combinations within one metal group. The results, however, are not transferable from one metal group to another (e.g. austenitic steel, ferritic steel, galvanized steel or copper). Note: If different materials within one metal group do not show any essential differences in the mechanic features (e.g. material and ), then it can be possible in individual cases to apply single or also overall test results from tests with one material to another one. 8

9 VdS en : (01) Table 2: Test modules and test sequence Test module A B1 B2 C D E1 E2 E3 F G Compliance Pressure test Pressure test with bent pipes Water hammer test Leakage test Flame test Resistance to temperature at -20 C Resistance to temperature at 110 C Torsion test Stress corrosion test Pressure loss test Vacuum test Marking durability test 2 1) Test module F is only applicable to copper alloy components (e.g. adapter fittings for connection of nonsystem components or sprinklers) 2) Test module G is only applicable to adapter fittings for connection of non-system components. Test module G is only applied if based on technical assessment of the differences between the pressfittings and the adapter fittings of the pipe system the results of the test modules B1 and C respectively cannot be applied to all adapter fittings. This is the case, if - the press part is different regarding geometry, material, wall thickness or production process; - the joining process at the joint of press part and adapter part is different and not at least equivalent; - the adapter part is constructive weaker than the press part. 3) The vacuum test is only applied, if this is required in the respective material specific further part of VdS When a pipe system is tested with only one nominal size, a test schedule is determined with the least test modules and test samples (design of test samples see ) as follows: a) 1 test sample of each component for test module A b) 1 test sample for test module B1 c) 1 test sample for test module C d) 1 test sample for each nominal size of the T-piece sprinkler outlet DN 10, 15, 20 for test module D e) 1 test sample each for test module E1, E2 and E3 f) 1 test sample for each component (random sample) made of copper alloy (e.g. for connection of non-system components or sprinklers) for test module F. Random sample is one fitting each per type of connection and material. g) 1 test sample per connection type (e.g. threaded or grooved connection) for connection of non-system components for test module G. Further test samples can be required in connection with tests according to section

10 VdS en : (01) When a pipe system is tested with several nominal sizes not all the tests must be conducted with each nominal size provided that components of identical design are used in the different nominal sizes. According to the following rules a serial specific test schedule is determined: h) 1 test sample of each component of each nominal size for test module A i) 1 test sample each of the minimum and maximum nominal size for test module B1 j) 1 further test sample for test module B1 k) 1 test sample for test module C Note: the nominal size for c) and d) is chosen according to following priority: DN 100, DN 50, DN 65, DN 80. l) 1 test sample of each nominal size for test module B2, with exception of the nominal sizes in b), c) and d) m) 1 test sample of each T piece sprinkler outlet DN 10, 15, 20 for test module D n) 1 test sample each (preferably DN 40) for test module E1, E2 and E3 o) 1 test sample for each component (random sample) made of copper alloy (e.g. for connection of non-system components or sprinklers) for test module F. Random sample is one connection component each per type of connection and material.to connect non-system components for test module F. Random sample is one fitting each per type of connection, material and nominal size. p) 1 test sample per connection type (e.g. threaded or grooved connection) for connection of non-system components for test module G. Note: the nominal size for i) is chosen according to following priority: DN 100, DN 50, DN 65, DN 80. Further test samples can be required in connection with tests according to section The test samples shall be submitted with records/documents as follows: System pipe: Fittings: inspection certificate 3.1 according DIN EN for each batch; inspection certificate 3.1 according DIN EN for each batch of the used tubes. If material specific requirements and proofs for the manufacturing quality are determined in the material specific further parts of VdS , then these proofs for the test samples shall also be submitted All test samples are delivered pre-assembled using the specified pressing techniques with one exception: One test sample of each specified pressing technique shall be assembled by the applicant in presence of the test engineer. 10

11 VdS en : (01) Table 3: Description of the test sample Test module Description of the test sample A B C D E F G Single parts, fittings Bends and two pipe ends of a length of 750 mm are used, they are connected by a T-piece according to Annex B, figure B.1 Two pipe ends of a length of 750 mm are used, they are connected by a bushing according to Annex B, figure B.2. Important: the drilled passages on the welded connection threads for venting and drainage shall be deburred and free of distortion on the inner pipe wall. T-piece with sprinkler outlet DN 10, or DN 15 respectively, or DN 20 respectively; one side provided with DN 40 female thread connection, other side closed. Two pipe ends of a length of 150 mm are used, they are connected by a bushing, the ends are reduced to a R1/2 female thread. With the test sample for module E3, one of the ends is manufactured without thread connection. Instead a hex nut M 10 of wrench size 17 is welded centrically on the end. Fittings Two pipe ends of a length of 750 mm are used (one end system component, the other end non-system component), they are connected by an adapter fitting using all necessary non-system components according to Annex B, figure B.2. Important: the drilled passages on the welded connection threads for venting and drainage shall be deburred and free of distortion on the inner pipe wall. 6.2 Pre-Test and identification Compliance test A visual and dimensional check is made to determine whether the test samples correspond to the description in the technical documentation (drawings, parts list and instructions for installation) and comply with the verifiable requirements of these guidelines Resistance to corrosion and ageing test On the basis of the drawings, the parts lists and the test samples it is assessed, whether corrosion and ageing may have a detrimental effect on the performance characteristics of the piping. In case of doubt, corresponding tests have to be conducted. 6.3 Assembly of the test connection The samples provided for assembly in the presence of the test engineer are mounted according to the installation instructions of the applicant with the tools specified by a representative of the applicant. 11

12 VdS en : (01) 6.4 Test of the mechanical strength Pressure test The test sample assembly is mounted on the test device according to Annex B, figure B.1. Subsequently the test sample assembly is completely filled with water and subjected to a test pressure of 4 times the allowable pressure. The test pressure is maintained for 10 min. Then the test sample assembly is pressure-relieved. The test sample assembly shall hold safely together. There shall be no signs of leakage, plastic deformations or rupture of the material, fittings sliding on the pipe after the test pressure had been reached, a projecting sealing element Pressure test with bent pipes The test sample assembly is filled with water and subjected to a test pressure of 4 times the allowable pressure. Subsequently, according to Annex B, figure B.1, the test force F is applied by ascending a hydraulic piston to generate the bending moment. The bending moment corresponds to the calculated moment when the maximum bending stress in the system pipe has reached half the elastic limit. Once the test force has been reached, the piston remains in its position; the test force may drop. After 10 min the test sample assembly is relieved. (force and internal pressure). Note: Calculation of the bending moment Bending moment R e = = 0,5 R e (D^4 - (D - 2T)^4 ) / (32 D 10^3 ) [Nm] Elastic limit R eh or yield stress Rp 0,2 of basic material of system pipe [N/mm²] D = Pipe outer diameter (system pipe) [mm] T = Wall thickness (system pipe) [mm] For reducing fittings the dimension of the smaller nominal size does apply to determine the bending moment. The test sample shall hold safely together. There shall be no signs of leakage, a projecting sealing element Water hammer test The test sample assembly filled with water, as left after the test according to clause 6.4.2, is shock-pressurised as follows (test medium water). Number of cycles: 3000 cycles Test pressure: 25 bar above the allowable pressure The pressure in the test sample assembly shall be 4 bar maximum before each cycle. 12

13 VdS en : (01) The test sample assembly shall hold safely together. There shall be no signs of leakage, plastic deformation or rupture of the material, a projecting sealing element Leakage test The test sample assembly is completely drained of water. Subsequently the test sample assembly is pressurised with air for 10 min with a test pressure of 10 bar and is examined for leakage using a leak detection spray. Then the test sample assembly is pressure relieved. The test sample assembly shall be tight. 6.5 Flame test Flame test for the use in wet and dry systems The flame test shall be conducted in a room free from air draught. The test sample is mounted on the test device according to Annex B, figure B.2, filled with water and bent. To reach this the test sample is filled with water, pressurized to a test pressure of 4 times the allowable pressure and subjected as shown in Figure B.2 with the force F to create at least 75% of the bending moment according to clause Afterwards the test sample is drained. Note: The test sample is regarded as drained when the flow from the drainage connection specified in figure B.2 (2*) changes to drops. The fire pan, stainless steel (VA) of 2 mm wall thickness, dry and clean, is, in accordance with Figure B.2, positioned centrally underneath the sealing bulge of the press connection (bushing) facing away from the bent pipe end. Subsequently the fuel is filled into the pan and ignited. Test parameters: Fuel: Filling quantity: Methanol 0,5 l with nominal sizes < DN 100; 1,0 l with nominal size DN 100 With reducing fittings the filling quantity shall be based on the smaller nominal size. Burning time: 5 min with nominal sizes < DN 100; 8 min with nominal size DN 100 With reducing fittings the burning time shall be based on the smaller nominal size Immediately after the burning time the flame is extinguished and the test sample is allowed to cool down. For this purpose the test sample is immediately sprayed with water until no more vapour is visible, however at least for 3 minutes. 13

14 VdS en : (01) Subsequently, the test sample is completely filled with water, subjected to a test pressure equal to the allowable pressure. Leakage water may drip, but not flow or spray out. Subsequently the test sample is relieved (force and internal pressure) Flame test for the limited use in wet systems The test is conducted according to with the following exception: The test sample is not completely drained before the flame test. One third of the water quantity remains inside the test sample. 6.6 Resistance to temperature test Resistance to temperature at -20 C The test sample is subjected to an air pressure of 3,5 bar and cooled down to -20 C. This temperature is held for 12 days. Subsequently, the test sample is removed from the climatic chamber, pressurized at once again with an air pressure of 3,5 bar and examined for leakage with leak detection spray. The test sample shall be tight in this condition Resistance to temperature at 110 C The test is conducted according to section 6.6.1, however with the following modifications: The test temperature is 110 C. The test sample is subjected to an air pressure of 3,5 bar only for a short time before the exposure to temperature, examined for leakage and then relieved. Before temperature exposure, the test sample is filled with water by %. After cool down to room temperature a leakage test according to section is conducted. 6.7 Torsion test One pipe end of the test sample is fixed and a torque of 80 Nm is subjected to the other end. The pipe ends shall not twist against each other. 6.8 Stress corrosion test Note: This test only refers to components made of copper alloy (e.g. adapters for connection of non-system components or sprinklers). The samples are degreased and thereafter subjected for 10 days to a moist ammonia-airatmosphere in a glass container of 10 to 30 l volume whose cover is formed such that a dripping of condensate on the samples is avoided. The watery ammonia solution has a specific weight of 0,94 kg/dm³. The samples are approximately 40 mm above the liquid level. 10 cm³ of the solution is filled into the container per litre volume of the container. Then the atmosphere consists of about 35 % ammonia, 5 % water vapour and 60 % air. The test is conducted at atmospheric pressure and a temperature of (34 ± 2) C. A capillary pipe is fitted for pressure equalization. 14

15 VdS en : (01) After the test the samples are cleaned and dried and subjected to a visual check. There shall be no visible signs of cracks in the metal. 6.9 Pressure loss test on fittings for sprinkler support The sample is connected to a water supply and at the outlet equipped with a measuring nozzle according to the table below. The sample is streamed at increasing and decreasing pressure at least in a range of 0,5 bar to 6,5 bar. The pressure upstream of the fitting and the flow are measured preferably at a step size of 1,0 bar. Table 4: Table of measuring nozzles Outlet nominal size (sprinkler connection) DN 10 DN 15 DN 20 Thread connection 17,2 mm 21,3 mm 26,9 mm K-factor of measuring nozzle 57 ± 3 80 ± ± 6 Then the K-factor is calculated according to EN from the pressure and the flow values. For comparison, a K-factor measurement according to EN is conducted with the same measuring nozzle. The K-factor of the test sample equipped with the measuring nozzle shall be not less than 97,5 % of the K-factor of the comparison measurement Vacuum test Note: The vacuum test is only applied, if this is required in the respective material specific further part of VdS The pressure in the test sample is decreased for 10 minutes by 0.6 bar below ambient pressure. The test sample shall be tight Marking durability test The test sample is immersed in potable water (ambient temperature) for 5 minutes once each day for 10 working days. After the sample is removed from the water each day, it shall be rubbed dry in the area of markings using a clean and dry cotton or paper towel (10 rubbing actions in both directions; force on the marking area 10N to 20N). The markings shall not bleed, smear, or deposit residue on the towel. Subsequently the marking of the same test sample shall be covered with petroleumbased grease and remain undisturbed for 24 hours at ambient temperature. After that time has elapsed, the greese is removed from the test sample using clean and dry cotton or paper towels. No bleeding or smearing of the marking shall occur. 15

16 VdS en : (01) 6.12 Other tests Where necessary due to special designs, performance characteristics or new manufacturing methods, additional tests will be conducted in agreement with the manufacturer. 16

17 VdS en : (01) Annex A Order specification, sealing element This annex contains the minimum order requirements. Valid for sealing elements - Standard or production drawing (if the sealing element does not comply with a standard) - Material, specification - Dimensions and tolerances - Marking 17

18 VdS en : (01) Annex B Test device for pipe systems The figures B.1and B.2 show an example for a test device. Other test devices can be used as far as the dimensions are observed. The force F can also be applied from below to the test sample in case the test sample is firmly clamped on the counter bearing (dimension 180 mm from test sample). 1*: Muffe mit Innengewinde (BSP) R ½ (DN 15), zylindrisch (!nicht konisch!) 1*: bushing with female whitworth pipe thread (BSP) R ½ (DN 15), cylindric (!not conic!) Figure B.1: Test device for pipe systems 1*: Muffe mit Innengewinde (BSP) R ½ (DN 15), zylindrisch (!nicht konisch!) 1*: bushing with female whitworth pipe thread (BSP) R ½ (DN 15), cylindric (!not conic!) 2*: Muffe mit Innengewinde (BSP) R ½ (DN 15), zylindrisch (!nicht konisch!), Bohrung im Rohr entgratet 2*: bushing with female whitworth pipe thread (BSP) R ½ (DN 15), cylindric (!not conic!), bore in pipe deburred Figure B.2: Test device for flame test 18

19 VdS en : (01) Annex C Example test schedule Example test schedule for a press fitting pipe system with the following scope: eight nominal sizes DN 20 to DN 100 only one material only one design of seal ring pressing with only one special tool adapters not made of copper alloy The individual, order-specific test schedule can deviate from the following example, if this results from the rules according to section Pre-testing, on the basis of the documentation Main test with the test samples: Nominal size [DN] Test module (corresponding test sample description see ) B1 B2 B2 B2 E1 E2 E3 D B1 C B2 B2 B Compliance in addition, further samples are subjected to a compliance test as random sample Pressure test Pressure test at bending Water hammer test Leakage test Flame test Resistance to temperature at - 20 C Resistance to temperature at 110 C 6.7 Torsion test Stress corrosion test 6.9 Pressure loss test 2 2 The numbers indicate the sequence of the detail tests conducted with one sample For test module D several samples may be necessary according to the rules in section Several test schedules will be necessary for different designs of pressfitting pipe systems e.g. different materials, seals or pressing tools/pressing techniques. 2 19

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