1、BRITISH STANDARD Heating boilers - Part 4: Heating boilers with forced draught burners - Special requirements for boilers with forced draught oil burners with outputs up to 70 kW and a maximum operating pressure of 3 bar - Terminology, special requirements, testing and marking The European Standard
2、EN 30341999 has the status of a British Standard ICs 91.140.10 3s EN )03-4:1999 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW S.TD.BSI BS EN 303-4-ENGL L994 m Eb24bb9 0790b59 7Eb W BS EN 303-4.1999 National foreword This British Stanard is the English language version of EN
3、30341999, Heating boilers -Part 4: Heating boilers with forced draught bumers - S -present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK inkrests informed; - monitor related internaiomd and European developments and promulgate the
4、m in the UK. A list of organizations represented on this committee can be obtained 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 ent
5、itled “International Standards Correspondence Index”, or by using the “Find” fadity of the BSI Standards Electronic Cataiogue. A British Standard does not purport to include ali the necessary provisions of a contsact. Users of British Standards are responsible for their correct application. Complian
6、ce with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 21 and a back cover. The BSI copyright notice displayed throughout this document indicates when the docum
7、ent was last issued This British Standard, having been prepared under the direction of the Engineering Amd. No. Date Sector Committee, was published Amendments issued since publication under the authority of the Standards Committee and comes into effect on 15 August 1999 O BSI 08-1999 ISBN O 580 302
8、27 X Comments STDmBSI BS EN 303-4-ENGL 3999 II 3624669 0790660 438 6 EUROPEAN mmm NORME EUROPENNE EXJROP- NORM EN 30M January 1999 ICs 01.040.91; 91.140.10 Descriptors: central heating, boilers, definitions, specifications, equipment specification, materiais, steels, cast iron, copper, production co
9、ntrol, chemical composition, mechanical properties, welded joints, welding, dimensions, performance evaluation, tests, marking, technical notices English version Heating boilem - Part 4: Heating bile= with forced draught bumen- Speciai requirements for boilem with forced draught oil bumem with outpu
10、ts up to 70 kW and a rnmirnum operating pressure of 3 bar- % - dangerous accumuiations of combustible gases (fuel mixed with air) in the combustion chamber and in the flues are prevented; - gases cannot leak from the boiler in dangerous quantities. - components of accessories e.g. burner covers, if
11、the parts are ed outside of the boileq - intend components of controis and safety equipment; - operating handles; - electricxi equipment; - thermal insulation (see 4.1.6.8); only asbestosfree materials are allowable. Combustible materials are allowable for Component parts of cove=, operating, contro
12、l and safety devices and electrical accessories shall be arranged in such a way that their surface temperatures, under steady state conditions, do not exceed those specified either by the manufacturer or in the component part standard. The materials for the parts subject to pressure shall be in acco
13、rdance with the materiai specifications in this standard. They shall be suitable for the purpose and treatment intended. The mechanical and physical properties as weil as the chemical composition of the materiais shall be guaranteed 4.1.2 Production documentation . - exceeding a prest limit prEN 303
14、-11 3.19 overheat cut-off device a device that causes shutdown and non-volatile lockout before the boiler is damaged andor before safety is put in question room-sealed boilers a boiler in which the combustion circuit is substantiaiiy sealed With respect to the room h Which the appliance is installed
15、 4.1.2.1 Dmwings The following shall be specified in the boiler drawings or in the relevant documents: - the specified materialq - the welding process, the joint type (generally the symbol for the joint type is sufficient) and the welding fiHe=; - the maximum allowable operating temperature - the ma
16、ximum allowable operating pressure in bar, - the test pressure in bar, - the nominai heat output or the heat output range for every boiler size in kW. 4.1.2.2 Manufacturing controls Manufacturing control shall be carried out. 3.20 in OC; O BSI 08-1999 STD.BSI BS EN 303-4-ENGL 1999 E 3b24bb9 0770bb5
17、TllrT m Page 6 EN 30341999 4.1.3 Heating boilers of steel and of non-ferrous materiais 4.1.3.1 Executwn of welding work Boiler manufacturers who cany out welding work shall meet the requirements of EN 287-1 and EN 287-2: - only welders who are qualified in the welding of the materials to be processe
18、d may be used; - equipment shall be available to allow defect free welding to be carried out; - supervision of the welding shall be ded out by staff qualified in welding (at least one supervisor shall be so qualified). 4.1.3.2 Welded joints and wedirtg fWs The materials shail be suitable for welding
19、. The materials in accordance with Wle 1 are suitable for welding and do not require additional heat treatment after welding. The welded joints shall not show any cracks or bonding faults and shall be defect nee over the whole cross-section for butt welds. One-sided fillet welds, and half Y-welds wh
20、ich have been welded through, shall be kept substantially free from bending stresses. Smoke tubes, inserted stays and similas components need not be counterwelded Double fillet welds are only permissible when sufficiently cooled. Projections into the flue gas side in areas of high thermal stresses s
21、hall be avoided. Corner welds, edge welds and similar welded connections which are subjected to high ben- stresses during production and operation are to be avoided. For welded longitudinal stay bars or stay tubes the shearing cross-section of the fillet weld should be at least 1,25 times the requir
22、ed stay bar or stay tube cross-sectional area See pable 2 (dimensions in mm) for details on the welded joints mentioned. Welding fiilers shall be suitable for the material being used. The terms used in Table 2 are in accordance with IS0 2553. The reference numbers of weldmg processes are in accordan
23、ce with IS0 857 and EN 24063. 4.1.3.3 Parts of steel suqiect to pressure The steels listed in ILible 1 shall be used. The specification of the materials shall be documented by a Worb certificate (see EN 10021). These certificates shall be obtained by the boiler manufacturer. This does not apply to s
24、mall components, e.g. sockets up to DN 50, screws and nuts. O BSI 08-1999 STD-BSI BS EN 303-4-ENGL 1399 Lb24bb9 0790bbb 955 U EN 10025 Page 7 EN 30341999 S235JR 1.0037 S235JRG2 1.0038 Table 1 - Materiais s2mo S235J2G3 I References 1.0114 1.0116 Material type S275JR S275JO I Material numbers in accor
25、dance with EN 10027-2 1.0044 1.0143 S275J2G3 s355JR 1.0144 1.0045 S355JO S355J2G3 1.0553 1.0570 S355EG3 1.0595 I EN 100282 I I 1 P235GH F265GH 1.0345 1.0425 1 F295GH P355GH 16Mo3 1.0481 1.0473 1.5415 I I 11CrMo9-10 I 1.7383 I 13CrMo4-5 1CrMo9-10 1.7335 1.7380 EN 10120 P245NB I I P355NB 1 1.0557 I 1.
26、0111 P265NB P31oNB 1.0423 1.0437 I X6CrNiNbl810 I 1.4550 1 X6CrNiMoll17-12-2 11.4571 EN 100882 X5CrNi18-10 I I 1 X6CrNiMoNbl7-12-2 I 1.4580 1.4301 I I X3CrNiMo17-3-3 I 1.4436 I X6CrNi17-12-2 X6CrNiTil8-10 O BSI 08-1999 1.4401 1.4541 Page 8 EN 303-4:1999 - No. - 1.1 1.2 1.3 - 1.4 1.5 Table 2 - Weld T
27、erm Square butt weld 11 21 1) one side 2) both sides Square butt weld n Square butt weld (double) Single-V butt weld Single-V butt weld 11 i) 30“ to 50“ joints and weldin Material thickness , mm 26 up to 12 8 up to 12 up to 12 uptQ 12 processes Welding process*) 12 ill) 135 12 Remarks Permissible up
28、 to t=8mmonuseof deep penetration electrodes or welding on both sides Root gap 2 mm to 4 mm with stiffener, powder holder necessary Root gap 2 mm to 4mm Deep penetration electrodes must be used for manual electro welding Weld preparation V-seam 60“ Weld preparation depending on thickness of material
29、 V-S- 30“ to 50“ O BSI O81999 STD-BSI BS EN 3U3-4-ENGL 1999 9 Lb24bb9 0790bbf4 727 111 Page 9 EN 30341999 Table 2 - Weld joints and welding processes (continued) No. 1.6 1.7 - 1.8 1.9 - Term )ouble-V butt weld ?-Y ) 30“ to 50“ 3utt weld between plates with rajsed dges herlap welding herlap welding (
30、cont) Wet weld Material thickness t mm pater than 12 56 16 56 56 Welding process*) 135 12 135 141 131 (111) 135 12 Remarks Neid preparation iouble V-seam 30“ to 50“ depending on naterial thickness My permissible in rxceptional cases for mrts welded in. Moreover, the welds nave to be kept iargely fre
31、e from Dendhg stresses. Not witable for directly Fired wall parts. c = 0,s Welds of this type XE to be kept largely frec rom bending Weses. Not suiable for directly fired wa P-. s=t Not suitable for directly ked wall P- S= Welds of this type an to be kept largely frel Com bending stresse! a=t O ES1
32、08-1999 STD.BS1 BS EN 303-it-ENGL Lqqq I bb24bbq 0750bb9 Lb5 5 12 12 Page 10 EN 30341999 135 12 (111) 135 Table 2 - Weld .ioints and welding processes (continued) No. 2.1 - 2.2 - 2.3 - 2.4 Term Double Met weld Doublebevel butt weld Singlebevel butt weld Singlebevel butt weld Material thickness t I W
33、elding process*) 5 12 12 12 s 12 Remarks a=t a=2/3t a=t a=2t For (111) = 60“ For 135, 12 = 45“. to 50“ For (111) = 60“ For 135, 12 = 45“ to 50“ O BSI 08-1999 STD.BSI BS EN 303-4-ENGL 1999 - Lb24bb9 0790b70 3137 I Reference number 12 111 131 135 141 Page 11 EN 30341999 Process Submerged arc welding M
34、etal-arc welding with covered electrode Metal-arc inert gas welding; MIG welding Metal-arc-active gas welding; MAG wleding Tungsten inert gas arc welding; TIG welding Table 2 - Weld joints and welding processes continued) No. i.5 2.6 - 2.7 Term , i !., Iateriai thickness t mm 12 Welding procees*) Re
35、marks Tube ends shall not project beyond met weld if it is subjected I 135 I Wei- in of tube under high thermal !3tress art 135 (111) Welding in of tube under high thermal stress For (111) = 60 For 135 = 45 tow O BSI 08-1999 STD.BSI BS EN 303-4-ENGL 1999 iri 1b24bb 0790b73i 213 lamellar graphite, al
36、uminium mm Page 12 EX 30341999 spheroidal graphite/annealed ferritic copper mm 4.1.3.4 Minimum waU thicFmesses The minimum wall thicknesses listed in Wle 3 axe specified hawig taken into consideration the material properties. For boilers which consist of individual geometrically identical pasts (sec
37、tions) the requirements of the minimum wall thickness for the complete range shall be in accordance with the boiler with the lowest nominal heat output. The wall thickness tolerance for carbon steels shall be as specified in EN 10029. The nominal minimum wall thicknesses of Table 3 apply to sheets,
38、tubes and forgings. Smaller wall thicknesses are only permissible on production of evidence showing equivalent perfonnance. Table 3 - Minimum wall thicknesses ;=bon ;eet;2,b 1 2Co;tc. corrosion protected idL steel and stainless steel Column a) For walls of the combustion chamber in contact with fire
39、 and water and flat walls of the convection heating surface. For walls only in contact with water and for rigidly stable (e.g. corrrugated) convection heating surfaces outside the combustion chamber. For circular tubes which are used in the convection part of the heat exchanger. Column b) Column c)
40、4.1.4 Boilers cast materials The manufacturer shall have personnel and equipment capable of carrying out the necessary materhl tests. During the manufacture of the boiler and other cast iron parts subject to pressure the following tests shall be carried out using separately cast test pieces for each
41、 batch: 1) tensile test in accordance with IS0 185, me A; the values given in Wle 4 are to be confirmed by the tensile test; 2) chemical analysis (C, Si, Mn, P; S); 3) Brinell hardness test in accordance with EN 1ooO3-1; 4) hod impact (for graphite iron). The results of the tests shall either be rec
42、orded in rewm countersigned by the works tester responsible, or works certificates in accordance with EN 10021 shall be drawn up. Works certificates and registers shall be kept for at least five years by the manufacturer and shall be accessible for examination. The repair of parts subject to pressur
43、e by welding is not permissible. 4.1.4.1 Parts of cast iron suwect to pressure The mechanical properties of cast iron used for parts subject to pressure shall, as a minimum, correspond to the values listed in Table 4. Table 4 - Minimum requirements on cast iron Cast iron with lamellar mailhite (see
44、IS0 185) - Tensile strength R, 2 150 N/m2 - Brinell hardness 16B HB to 220 Hl3 2,5/187,5 Spheroidal graphite iron (ferritically annealed) 1 -lnsilestrengthR, 2 400N/mm2 - hod imi3act 2 23J/m2 4.1.4.2 Cast parts of non$ou.s metals subect to pressure “able 5 - Examples for copper and copper alloys SF-
45、CU up to 5 up to 250 I CuNi30Fe I up to 10 I310 I up to 350 I 4.1.4.3 Minimum wa thkkwses The wail thicknesses given in the production drawing shall not be less than the minimum wall thicknesses listed in Table 6. The actual minimum wall thicknesses during manufacture of the boiler sections and othe
46、r pasts subject to pressure shall be greater than 0,s thes the thickness given in the drawing. Smaller wd thicknesses are only permissible on production of evidence showing equivaient performance. For boilers which consist of individual geometrically identical parts (sections) the requirements of th
47、e minimum wall thickness for the complete range shall be in accordance with the boiler with the lowest nominal heat output. Table 6 - Minimum wall thicknesses of boiler sections of cast material Nominal heat output QN kW O BSI 08-1999 STD.BSI BS EN 303-4-ENGL 1999 E 1624bb9 0770672 3sr Pockets for t
48、emperature control,*) Safety temperature limiter:) Thermometer, Pressure switch, pressure gauge Low water cut out device, safe - the flow temperature control and safety temperature limiter have a maximum sew limit of 85 OC and 100 OC respectively; - the operation of the boiler without water is preve
49、nted (for example by building in a low water flow switch); - no danger of fire exists from electrical equipment. The minimum distance from the surfaces of the flue gas carrying parts to combustible material sldi be 100 mm. 4.1.6.9 Sume temperature The average surface temperature of the boiler covers on the operator side shall not exceed the ambient temperature by more than 100 K. O BSI 08-1999 Page 14 EN 30341999 The surface temperature of operating levers and all parts which are capable of bein
