英文版dl 50311994　电力建设施工及验收技术规范 管道篇

1、ELECTRIC POWER TRADE STANDARD OF THE PEOPLES REPUBLIC OF CHINATHE CODE OF ERECTION AND ACCEPTANCEFOR ELECTRIC POWER CONSTRUCTIONPIPING SECTIONDL 5031-94Chief Editorial Department: Construction Cooperating Department of the Ministry of Power Industry 1994 BeijingNoteThis book is the English translati

2、on of The Code of Erection and Acceptance for Electric Power Construction Piping section DL 5031-94 In the event of any inconsistency between the Chinese-language text of the Code and the present English-language text of the Code, the Chinese-language text shall be taken as ruling.The Ministry of Po

3、wer Industry of the Peoples Republic of ChinaThe Notification of Issuing the Electric Power Trade StandardThe Code of Erection and Acceptance for Electric Power Construction (Piping section)All electric power administrations, all electric power bureau, electric power planning institutes, and electri

4、c power construction institutes of provinces (municipalities directly under the Central Government, autonomous regions) and Water and Electric Power Press:For adapting the development of electric power industrial technology and insuring the erection quality of pipes of thermal Power plant, the Code

5、of Erection and Acceptance for Electric Power Construction (piping section) DJ 56-79 issued in 1979 had been revised by the ministry. The new code should be looked upon as electric power trade standard and the code number is DL 5031-94. The standard is approved and issued now and will be go into eff

6、ect from Oct.!, 1994 and the older version should be abolished at the same time. Any question in the performing should be notified the Construction Cooperating Department of the ministry please.Apr. 9,1994Contents TOC o 1-3 h z u HYPERLINK l _Toc230583812 General rules PAGEREF _Toc230583812 h 4 HYPE

7、RLINK l _Toc230583813 Glossary PAGEREF _Toc230583813 h 6 HYPERLINK l _Toc230583814 Checking of pipes, pipe fittings, pipe accessories and valves PAGEREF _Toc230583814 h 6 HYPERLINK l _Toc230583815 General regulations PAGEREF _Toc230583815 h 6 HYPERLINK l _Toc230583816 Checking of pies PAGEREF _Toc23

8、0583816 h 6 HYPERLINK l _Toc230583817 Checking of pipe fittings PAGEREF _Toc230583817 h 7 HYPERLINK l _Toc230583818 3.4 Checking of pipe accessories PAGEREF _Toc230583818 h 7 HYPERLINK l _Toc230583819 3.5 Checking of valves PAGEREF _Toc230583819 h 7 HYPERLINK l _Toc230583820 4.0 Preparation of pipes

9、, pipe fittings and pipe accessories PAGEREF _Toc230583820 h 8 HYPERLINK l _Toc230583821 4.1 General regulations PAGEREF _Toc230583821 h 8 HYPERLINK l _Toc230583822 Elbow pipe PAGEREF _Toc230583822 h 8 HYPERLINK l _Toc230583823 4.3 Processing of reel pipes, pipe fittings and pipe accessories PAGEREF

10、 _Toc230583823 h 9 HYPERLINK l _Toc230583824 4.4 Processing of supporting and suspending bracket PAGEREF _Toc230583824 h 11 HYPERLINK l _Toc230583825 5.0 Installation of pipes PAGEREF _Toc230583825 h 12 HYPERLINK l _Toc230583826 5.1 General regulations PAGEREF _Toc230583826 h 12 HYPERLINK l _Toc2305

11、83827 5.2 I Installation of high pressure pipe PAGEREF _Toc230583827 h 14 HYPERLINK l _Toc230583828 Installation of medium and low pressure pipe PAGEREF _Toc230583828 h 15 HYPERLINK l _Toc230583829 Installation of water drainage pipe PAGEREF _Toc230583829 h 15 HYPERLINK l _Toc230583830 Installation

12、of valve and flange PAGEREF _Toc230583830 h 15 HYPERLINK l _Toc230583831 5.6 Installation of supporting and suspending bracket PAGEREF _Toc230583831 h 16 HYPERLINK l _Toc230583832 Test and clean of pipe system PAGEREF _Toc230583832 h 17 HYPERLINK l _Toc230583833 Tightness test of pipe system PAGEREF

13、 _Toc230583833 h 17 HYPERLINK l _Toc230583834 6.2 Cleaning of pipe system PAGEREF _Toc230583834 h 18 HYPERLINK l _Toc230583835 7.0 Acceptance of works PAGEREF _Toc230583835 h 19 HYPERLINK l _Toc230583836 Appendix ATypical data in the construction and acceptance of pipe system in power plant PAGEREF

14、_Toc230583836 h 20 HYPERLINK l _Toc230583837 Appendix BInstallation regulation of oxygen pipe and acetylene pipe system PAGEREF _Toc230583837 h 31 HYPERLINK l _Toc230583838 Supplementary instruction: PAGEREF _Toc230583838 h 32General rulesThe code applies to the configuration, construction and accep

15、tance of following pipes of thermal power plant and thermal power network:The main steam pipes of 600MW or lower subcritical parameter thermoelectric generating set and corresponding re-heating steam pipes and main water supply pipes;General steam and water pipes, thermal power network pipes and com

16、pressed air pipes in thermal power plant;Temporary pipes used in construction.The code does not apply to the following:Cast iron pipes;Reinforced concrete pipes;Non-ferrous (titanium, copper and etc.) pipes;Nonmetal (plastic and etc.) pipes;Nonmetal lining pipes;Composite metal pipes.For the special

17、 construction and acceptance of following types of pipes, regulations in corresponding section of the Code of Erection and Acceptance for Electric Rower Construction should be also complied besides the technology requirements in this code:All types of pipes in the steam turbine and electric generato

18、r body;All types of pipes in boiler body, and pipes of fume exhaust system, ventilation system, coal system, fuel system, gas burning system and dust removal system;Oil pipes and all types of water treatment pipes;All types of pipes of hydrogen generating system and hydrogen supply system;Thermal me

19、ter pipes;Oxygen and acetylene pipes.Except the sections with other concrete stipulations in construction contract, the provisions in this code must be observed in the construction and acceptance of pipes of imported thermoelectric generating set.The piping installation of power plant must be carrie

20、d out by professional construction team with essential technical force, checking means and management level.The piping construction of power plant should be carried out according to the basic construction program, and following conditions are necessary:Designing files and other technology documents

21、should be fully ready, and a joint checkup must have been made for construction drawings;The construction organizing design and construction plan of piping project of electric power plant should have been compiled, checked and approved;Real technology communication and required technical training an

22、d examining should have been finished;Labor force, materials, machineries and checking means should be completed on the whole;Construction should satisfy the demands of environment;Water, power and compressed air used in construction should satisfy the demands of construction.Active national or trad

23、e (or special) technical standards must be complied for the manufacturing quality and choosing of pipes, pipe fittings and pipe accessories.Active SDJ68 the Maintenance and Keeping Regulation for Electric Power Basic Construction Thermal Power Devices and corresponding additional regulations should

24、be observed for the store of all types of pipes, pipe fittings and pipe accessories.All types of pipe should be constructed according to the design drawings, and it should be submitted t designing unit to treat in term of relevant regulation if the design should be modified or substitute material sh

25、ould be adopted.The relevant regulation in active DL 5007 the Code of Erection and Acceptance for Electric Power Construction (Welding Section of Thermal Power Plant) should also be observed in the cutting and welding operation f pipes construction besides the relevant regulations in this code.Regul

26、ations in SDJ 245 the Code of Erection and Acceptance for Electric Power Construction (Boiler Unit Set Section) should be complied 1ir the heat preservation and painting of pipes. And the painting of pipe should be carried out according to the regulation of DL 50I I the Code of Erection and Acceptan

27、ce for Electric Power Construction (Steam Turbine Unit Set Section).Relevant regulations of active DL 5009.1 the Safety Operating Regulation of Electric Power Construction (Thermal Power Plant Section) must be observed for the safety, environment and fire protection in the piping construction of ele

28、ctric power plant.GlossaryPipe fittings- the general designation of parts and elements which composing piping system with pipes together, including elbow, elbow pipe, tee pipe, converging tube, pipe connecting saddle, flange, dead end, end plate and etc.Pipe accessories- external supporting parts of

29、 piping system, including supporting and suspending bracket, shim, sealing parts, fastening parts and so on.Elbow piperefers to the pipe with bending axial line.Elbow- refers to the elbow pipe which bending radius is no more than 2D, and straight section is less than 10.Miter elbow- elbow made up of

30、 two or more straight pipe sections which welding together in the plane of equal bend angle (also called welding elbow or shrimp elbow). Calculation wall thickness of straight pipe- the Min. wall thickness of straight pipe plus the negative deviation value of the wall thickness of straight pipe.Moni

31、toring section pipe section used to monitor creep, which installed on horizontal section of main steam .pipes that designing temperature is above 4500C, or reheating high temperature steam pipes.Creeping expansion measuring point equipments or marks to measure the creep deformation of pipes, which i

32、nstalled on motoring section pipes or steam pipesPipe classification electric power plant pipes can be classified according to designing pressure p as main parameter, refers to table 2.0.9.Table 2.0.9 Pipe classificationPipe classificationMain parameterHigh pressure pipep8 MPaMedium pressure pipe8 M

33、Pap 1.6 MPaLow pressure pipep1.6 MPaNote: reheating section and heating section pipes should be looked upon as high pressure pipes.Checking of pipes, pipe fittings, pipe accessories and valvesGeneral regulationsQualified certificate of manufacturer must be provided for pipes, pipe fittings, pipe acc

34、essories and valves, and corresponding indexes should be in concordance with active national or trade technical standards,Specification, material and technical parameter must be checked according to the design requirements prior to the using of any pipe, pipe fitting, pipe accessory and valve.Appear

35、ance inspection is required prior to the using of any pipe, pipe fitting, pipe accessory and valve, and the appearance demands are as following:Without any defects such as crack, shrinkage cavity, included slag, adhering sand, folding, missing welding, coldlap and so on;The surface should be smoothn

36、ess without any sharp scratches;Concave depth should not be more than 1.5mm, and the Max. dimension should not be 5% more than the pipe perimeter, and not be more than 40mm,Spectrum reexamining is required and material marks should be made prior to the using of pipes, pipe fittings pipe accessories

37、and valves which made of medium and low alloy steel.Checking of piesFollowing items must be to determine if they are in ac0dance with active national or trade technical standards prior to the construction of pipes which designing pressure is more than or equalPa.Analysis results of chemical composit

38、ion;Test results of mechanical property (tensile strength, yield strength and ratio of elongation);Test results of impact ductility for high pressure alloy steel pipes which wall thickness is more than or equal to 12mm;Heat treatment condition or metallurgical phase analysis results of alloy steel p

39、ipes.Welding seam checking report must be examined prior to the using of seamed pipe which designing pressure is more than 0.1 MPa.Local defects such as scratches, concave cavities and corrodes on pipe surface should be checked; pipe wall thickness which had been treated should not be less than the

40、calculation wall thickness of straight pipe, and the checking report must be recorded and submitted.Thickness of no less than 3 cross sections should be measured and checked for medium or low alloy steel pipes which used as high pressure, and the recording is required.Qualified steel pipes should be

41、 stored according to their materials and specifications, to avoid corrosion.Checking of pipe fittingsFollowing items must be checked to determine if they are in accordance with active national or trade technical standards prior to the pipe fittings used in the construction of medium or high pressure

42、 pipes:Analysis results of chemical composition;Heat treatment condition or metallurgical phase analysis results of alloy steel pipes;Nondestructive flaw detection results of high pressure pipe fittings.2 Sealing surface of flange should be smooth and clean without radial groove, and air cavity, cra

43、ck, burr or other defects that can reduce strength and connecting reliability are forbidden.Flanges with concave/convex surface or concave/convex ring should be snapped naturally, and the height of concave surface should not be less than the depth of notch.3.3.4Supporting area of connecting bolts on

44、 flange end face should be parallel to the junction surface of flange, to insure even force acted on flange end surface when connecting.Dimensions of each part should be checked according to the design drawing and examined to determinate its conformity with flange on device to be connected, to ensur

45、e proper connection.3.4 Checking of pipe accessoriesThread of bolts and nuts should Be undamaged without any defects such as scratches, burrs and etc. and the matching between bolt and nut should be in good condition without loosen or blocking.Each alloy steel bolt, which designing temperature is ab

46、ove 430 oC, and diameter is more than or equal to M30, should be numbered and its hardness should be checked, and unqualified one must not be used.3.4.3Pad material of flange should be in concordance with the designing requirement. Table A5 in Appendix A can be used to select material in case of no

47、concrete requirement provided.Asbestos rubber pad should be soft and pliant, without any aging or delaminating; and any defect such as buckle and wrinkle is forbidden on surface.Visual inspection should be made for the surface of metal shim with leveling rule, the good contact is necessary and defec

48、ts such as crack, burr, rust or coarse processing are not allowed; and its hardness should be less than the flanges.Radial scratch, loosen and other defects are all not allowed for the cladding metal and winding shim.Assembling dimension and welding type of steel structure of pipe supporting and sus

49、pending bracket should be concordance with the regulation of the code 4.4.Working surface of sliding bracket should be smooth and move flexibly without any blocking.3.4.9Spring of pipe supporting and suspending bracket should be checked according to the article and of the code.3.5 Checking of valves

50、Following examining is necessary prior to the installation of all types of valves:If padding material is in concordance with the requirement of design, and if padding method is correct or not. Sealing padding material can be selected according to the Table A6 in Appendix A in case of no design requi

51、rement provided;3.5.1.2Whether corrosion occurs on the valve stem wherever padding sealing;If the action of switches are flexible and the indications are all correct;Obvious manufacturing defect is forbidden on the appearance of casting valve.Tightness checking must be made prior to the installation

52、 of valve used as closed circuit element (acting as isolation), to check the tightness of joint surfaces between valve seat and valve core, valve cover and padding chamber. Water pressure, which 1.25 times more than pressure marked on nameplate, should be applied in the tightness test of valve.No le

53、ss than 10% (at least 1 vale) in the same batch (the same manufacturer, specification and model) must be checked by sampling for tightness test for low pressure valve; additional 20% should be checked by sampling in case of someone is unqualified, and if someone does still not pass, all valves shoul

54、d be checked one by one. Tightness test must be done one by one for all valves used on high pressure pipe.Tightness test of sealing surface of valve core can be carried out with color painting method for safety valves and valves which nominal pressure no more than 0.6 MPa and inside nominal diameter

55、 no less than 800mm; water pressure method can be replace by oil or water penetration method to perform tightness test for large caliber welding valve which inside nominal diameter is more than or equal to 600mm.Paint such as grease are strictly prohibited on the joint surface prior to the tightness

56、 test of valve.3.5.6Method of water pressure tightness test must be in concordance with the requirement of valve manufacturer. In the test, water should be filled in from the upstream of valve flap for shut off valve, and all sealing surface should be checked with valve closed for gate valve.All qua

57、lified valves should be kept well according to their classification after tightness test, and any water reminding in chamber must be remove completely.Dismounting checking is necessary for following valves:Valve which designing temperature is more than or equal to 450;Safety valve and throttle valve

58、;Unqualified valve in the tightness test.3.5.9Any dirt and foreign material must be removed thoroughly prior to dismounting valve, or opening/closing operation and dismounting are forbidden; dismounting order specified by manufacturer must be observed when valve with special structure is been dismou

59、nted, to avoid damaging parts or hampering personnel safety.Following checking is necessary for valve dismounted: Spectrum rechecking should be carried out for interior parts of alloy steel valve (no marks noted on parts is allowed, while check results must be recorded);3.5.10.2Whether the joint bet

60、ween valve seat and valve case is firm, without loosen;Whether the joint surface between valve stem and. valve seat is coincide, and without defects;Whether the connection between valve stem and valve core is flexible and reliable;Whether the valve is bend and corrosion, and the tightness degree of