EN 13090-2000 en Means for Resealing Threaded Joints of Gas Pipework in Buildings《建筑物中气体管道螺纹接头再密封方法》.pdf

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1、STD*BSI BS EN 13090-ENGL 2000 Lb2Ybb9 O883433 582 I BRITISH STANDARD Means for resealing threaded joints of gas pipework in buildings The European Standard EN 13090.2000 has the status of a British Standard ICs 23.040.80; 91.140.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITED BY COPRIGHT LAW

2、 I BS EN 13090:2000 STD-BSI BS EN L3090-ENGL 2000 1624bbq 0883434 419 m BS EN 130902000 AmdNo. Date This British Standard, having been prepared under the direction of the Engineering Sector COmmiUee, was published under the authority of the Standards Committee and comes into effect on 15 December 20

3、00 Comments O BSI 12-2000 ISBN O 580 36751 7 National foreword This Briish Standard is the official English language version of EN 13090:2000. The UK participation in its preparation was entrusted to Technid Committee PSm, Gaskets, which has the responsibility to: - aid enquirers to understand the t

4、ea - present to the responsible European committee any enquiries on the - monitor reWd international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informe them in the UK. A list of organizations represented on this committee can be obtain

5、ed on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ fac

6、ility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provisions of a contract. Usem of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obliga

7、tions. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. STD-BSI BS EN t3090-ENGL 2000 b lb24bb9 0883455 355 I EUROPEAN STA

8、NDARD NORME EUROPENNE EUROPISCHE NORM EN 13090 October 2000 ICs 23.040.80 English version Means for resealing threaded joints of gas pipework in buildings Matriaux pour la rtanchit des raccords filet application of the sealant by e.g. the filling, spraying or wicking method, removal of surplus seala

9、nt; final soundness test and re- establishment of the gas supply. c) Appropriate health and safety data sheets conforming to the requirements of the country of use. - STD-BSI BS EN 13090-ENGL 2000 E Lb24bbS 0883420 712 E Page 6 EN 13090:2000 6 Test methods 6.1 Test of sealants as received 6.1.1 Test

10、 of corrosiveness The corrosiveness of the sealant shall be tested using copper, copper-zinc alloy, zinc and low carbon steel strips each 75 mm long, 13 mm wide and not less than 0,5 mm thick. Mechanically abrade both faces and the edges of each strip to obtain a uniform finish free from defects. Po

11、lish each strip with emery paper (grade No. 400) and then clean with successive pads of cotton wool until a fresh pad remains unsoiled after use. Wash each strip with acetone and allow it to dry. Use clean forceps for all further handling of the strips. Coat 50 mm of one side of each of two test str

12、ips of the same metal with sealant. Lay one strip, treated side up, on a horizontal surface and place the other with an overlapping of the coated 50 mm directly on top, treated side down. Hold in position with a (200 * 10) g weight. Store the test strips for (336 f 2)h at (20 15) OC and then separat

13、e them - if necessary after warming up. The cleaned surfaces of the test strips shall show no pitting due to the effect of the sealant, but changes in the color and clouding of the polished surfaces shall be acceptable. 6.1.2 Test of effect on seals The effect of the sealant on seals used for interi

14、or gas pipework shall be tested in accordance with 7.6 of EN 549:1994 by assessing the swelling caused by the sealant (instead of pentane) and the behaviour at subsequent drying of specimens made from nitrile butadiene rubber (NBR) with an IRHD hardness of 75 * 5 which satisfy the requirements laid

15、down in EN 549:1994. The increase in mass due to swelling shall not exceed 1 O % and the change in hardness shall not exceed 1 O IRHD. The decrease in mass after drying shall not be in excess of 5 % and the change in hardness shall not be in excess of 10 IRHD. This test is not relevant for anaerobic

16、 sealants. 6.1.3 Test of effect on the combustion behaviour of fuel gases To test the effect of the sealant on the combustion behaviour of fuel gases, 100 ml of sealant shall be filled into a Woulf bottle with a capacity of approx. 500 ml. The gas inlet pipe shall run through the central bottle tube

17、 and shall end (5 f 1) mm above the liquid level. The gas outlet pipe shall end at least 50 mm above the liquid level. Air shall be removed from the bottle by purging the bottle with natural gas. Following purging, the pilot of a conventional instantaneous water heater and a thermo- electric flame s

18、upervision device shall be connected to the outlet using a short glass, metal or PTFE tubing and shall be adjusted properly. The length of the pilot flame shall then be measured at a given pressure. Following 72 h of continuous operation at (20 * 5) OC, the function of the pilot and the thermo-elect

19、ric flame supervision device shall be tested and the length of the pilot flame shall be measured. Further the nozzle, the burner, the temperature sensor and the thermo-electric flame supervision device shall be examined for deposits. STDmBSI BS EN 13070-ENGL 2000 W 1b24bb9 0883421 659 Page 7 EN 1309

20、0:2000 6.2 Test of sealants in test assemblies 6.2.1 Test of sealing properties 6.2.1.1 Preparation of test assemblies The test shall be performed on test assemblies prepared from new unused threaded joints. The parts specified in table 1 are required for the preparation of the test assemblies. Tabl

21、e 1 - Parts list for test assemblies Quantity 16 14 4 8 Fart Thread pipe Socket Socket, reducing Steel bar Thread R 1/2 Rp 112 Rp 1i2 x i2 Designation prEN 10255:1996 DN 40 welded, medium series; length: = 100 mm EN 10242 EN 10242 Length: = 150 mm width: = 20 mm thickness: = 2 mm Cut threads R 1 way

22、s. One thread - afterwards used for the connection of the different test assemblies - shall be cut in full accordance with IS0 7-1. After screwing these threads by hand into the sockets used for connection of the test assemblies 212 I 12 fully cut threads shall still be visible. The second thread sh

23、all be more deeply cut. After screwing these threads, to be tested afterwards, into the sockets used for the preparation of the test assemblies I4 to of a fully cut thread shall still be visible. The different threads on each pipe section shall be clearly marked to avoid confusion. Remove cutting oi

24、l before assembly by cleaning all threads successively with toluene and acetone in an ultrasonic bath. The steel bars are longitudinally and symmetrically welded on each of 8 sockets with the length of the bars on both sockets sides being the same. The pipe sections bearing the more deeply cut threa

25、d shall be hand assembled with these sockets using hemp, 0,3 g dried for not less than 72 h over silica gel. following the pattern of IS0 7-1 on both ends of the pipe sections in two different To reach an equal leakage rate of both joints of each test assembly the leakage rate of the assemblies shal

26、l first be reduced to about 30 ml/min (1,8 I/h) at a test pressure of 150 mbar by screwing both pipe sections equally deeply into the sockets. After that, one pipe shall be loosened until the leakage rate of the test assembly has risen to 50 ml/min (3 Vh). The end of the steel bar on the socket shal

27、l thereupon be welded to the loosened pipe to fix its position. The second pipe shall then also be loosened to obtain a total leakage rate across the test assembly of (85 * 5) mVmin (5 Vh) and the position of the second pipe shall also be fixed by welding. The overlap between the pipe sections and s

28、ockets shall be about 6 threads. Note 1 The thermal stress to which the assemblies are exposed by the above welding operations shall be minimized and the distance between each pipelbar weld and the socket shall not be less than 60 mm. Note 2 Test assemblies which are not treated by sealant promptly

29、ater preparation shall be stored in a desiccator over silica gel to prevent the hemp from swelling due to the absorption of moisture from ambient air. Page 8 EN 13090:2000 6.2.1.2 Sealing The test assemblies prepared in accordance with 6.2.1.1 shall be treated with the sealant in accordance with the

30、 instructions of the sealant manufacturer. Safety goggles and impervious protective gloves shall be worn when handling the materials and sealing the test assemblies. 6.2.1.2.1 Sealing by the filling method If not otherwise specified by the sealant manufacturer sealing shall be affected as follows. C

31、onnect the 8 test assemblies in two lines of 4 test assemblies using the remaining sockets and PTFE tape according to EN 751 -3 to seal the threaded joints. For sealants applied by complete filling of gas pipework the ends of these two lines are to be fitted with the reducing sockets. With the lines

32、 fixed vertically the upper ends are then fitted with stopcocks while the lower ends are connected to a pressure vessel. Pour sufficient sealant to fill both lines into the pressure vessel. After closing the pressure vessel the two lines of test assemblies are slowly filled with the sealant under a

33、slight pressure of about 0,2 bar which overcomes the hydrostatic pressure of the sealant in the lines. When the lines have been completely filled with the sealant and the overflow no longer contains any air bubbles close the stopcocks and pressurize the system at the pressure required by the manufac

34、turer for the specified time. After the sealing the pressures shall be released and the lines shall be drained according to the manufactures instructions. Then air shall be passed with a flow rate of (100 * 10) I/h for (120-50) h at a temperature of (20 * 5) OC through both lines. 6.2.1.2.2 Sealing

35、by the spraying method For sealants applied by the spraying method the ends of the two lines of test assemblies (see 6.2.1.2.1) shall be vertically fixed and connected symmetrically by two R 1/* T-fittings to a horizontal connection line with a third T-fitting in the middle. The upper ends of the tw

36、o lines of test assemblies shall be fitted with reducing sockets and closed by stop cocks. The two T-fittings at the lower end of the two lines shall be closed by plugs. The T-fitting in the connection line shall be connected to a S-shaped DN 40 pipework consisting of three horizontal sections of 5

37、m length each, which are connected by two vertical pipes of 0,25 m length and four elbow-fittings (see figure 1). The sealant shall be sprayed into the pipe system at the lower end of the S-shaped pipework according to the manufacturers instruction. An appropriate knock- out vessel to precipitate an

38、y remaining sealant dropplets followed by a filter are used to remove surplus sealant from the gas stream which is then conducted to a hood or vent. After the application the two lines of test assemblies shall be drained - if appropriate - and the residual sealant hardened or cured according to the

39、manufacturers instructions. 6.2.1.2.3 Sealing by wicking or capillary flow For sealants applied from the outside of the threaded joints of gas pipework and which penetrate the threads by wicking or capillary flow the test arrangement for the filling method (6.2.1.2.1) may be used (without the pressu

40、re vessel). It depends on the manufacturers application instructions whether the sealant shall be applied to the test assemblies under gas pressure. If the manufacturer specifies that the sealant can be applied to gas pipework under the normal distribution pressure, then the test assemblies have to

41、be pressurized with nitrogen to 100 mbar during both the sealing procedure and the drying or hardening period specified by the manufacturer. STD-BSI BS EN L3070-ENGL 2000 W Lb24bb7 0883423 421 Page 9 EN 13090:2000 The sealing of the two vertically fixed lines of test joints is performed according to

42、 the manufacturers instructions. However, it is not permissible to turn the lines for the sealing of the lower threaded joints. 6.2.1.3 Soundness test After the two lines of test assemblies have been sealed according to 6.2.1.2 the test assemblies shall carefully be disconnected from each other with

43、out stressing the sealed threaded joints under test and closed by rubber plugs or end caps. Each test assembly is separately tested for leaks under a test pressure of 150 mbar with a device capable of measuring leakage rates of I 2 ml/h. The temperature of the test assembly during the soundness test

44、 shall not vary more than * 0,5 OC to avoid any significant disturbance of the measurement. The temperature influence may be further lessend by inserting a plastic cylinder into the test assemblies. Each specimen shall be deemed to be tight if the leakage rate does not exceed 1 O ml/h at a test pres

45、sure of 150 mbar. If the leakage rate across one specimen is higher than this leakage rate, then said specimen shall not be used for further testing. If the leakage rate across a second specimen is higher than the specified leakage rate, the test shall be deemed to have been failed. In all tests req

46、uired under 6.2.1.3 through 6.2.1.6, no more than one specimen shall leak at a rate higher than 1 O mh. Only for one of 8 test assemblies a leakage rate up to 30 ml/h is permitted throughout all successive tests. All test assemblies shall be successively tested according to 6.2.1.4 to 6.2.1.6. Page

47、10 EN 13090:2000 6.2.1.4 Aging test The test assemblies shall be heated to (50 f 2) OC for 1000 h during which air heated by passage through a heat exchanger inside the oven to (502,) OC shall be passed through the test assemblies at a flow rate of (100 f 10) I/h. The soundness of the test assemblie

48、s shall thereafter be tested in accordance with 6.2.1.3. 6.2.1.5 Test of resistance against gas condensate Following the test of aging resistance in accordance with 6.2.1.4, all test assemblies shall be filled with iso-octane and stored in vertical positions for a period of (72 0,) h at a temperatur

49、e of (20 * 5) OC. After that period, the iso-octane shall be removed from the test assemblies and air shall be passed through the test assemblies at a temperature of (50 * 2) OC for a period of (120 0,) h at a flow rate of (100 I 10) Ih. The soundness of the test assemblies shall then be tested in accordance with 6.2.1.3. 6.2.1.6 Test of vibration resistance Following the test of condensate resistance in accordance with 6.2.1.5, all test assemblies shall be fitted with reducing sockets provided with a DN 15 nipple on which a bearing (ball race) shall be mounted.