This standard specifies the hole type and hole opening method, hole size and manufacturing tolerance of welded holes on pressure parts of industrial boilers. JB/T 1625-2002 Industrial boiler welded holes JB/T1625-2002 standard download decompression password: www.bzxz.net

ICS27.e60
Machinery Industry Standard of the People's Republic of China
JB/T1625-2002
Replaces JB/T1625—1993
Specification for welding tube holes of industrial boilers2002-12-27issued
Implementation on 2003-04-01
Issued by the State Economic and Trade Commission of the People's Republic of ChinaForeword,
Normative reference documents.
Pipe hole type and hole opening method
Pipe hole size..
Manufacturing tolerance
Figure 1 Welded pipe hole type
Pipe hole diameter,
Recess depth
Weld leg size
JB/T1625—2002
JB/T16252002
This standard replaces JB/T1625-1993 (Dimensions of welded pipe holes for medium and low pressure boilers). The main changes of this standard compared with JB/T1625—1993 are as follows: - The name of the standard is changed to "Welded pipe holes for industrial boilers"; - The title of Chapter 3 is changed to "Pipe hole type and hole opening method" (Chapter 3 of this edition); The provisions on pipe hole type are added (3.1 of this edition); The 1993 standard is revised to "2.2.2.3"; The hole-making method in version 3.1 has been modified (3.2 of this version): 1) It is stipulated that circular radial holes with an outer diameter of no more than 108mm should be made by mechanical processing: 2) It is recommended to use mechanical processing methods for rows of non-radial holes. If thermal cutting methods are used, template thermal cutting or other more advanced potential cutting methods should be used:
The content of 3.2 in the 1993 version has been cancelled:
The requirements for beveling the downcomer holes in 3.3 of the 1993 version have been modified as follows (3.3 of this version): 1) It is clarified that only the holes connecting the downcomer to the header are required, not all the downcomer holes: 2) It is clarified that when the outer diameter of the downcomer is no more than 108mm: an insert-type structure can be used. If an insert-type structure is used, beveling can be avoided: 3) The beveling is clarified The type is full penetration groove: the provisions on the recess depth when the recess hole is opened for the pipe with a nominal outer diameter of 73mm are supplemented (Table 2 of the 1993 edition: Table 2 of this edition>
Change the "-down pipe hole" in 4.3 of the 1993 edition to "the pipe hole of the riding seat connection" (4.3 of this edition): The diameter and manufacturing tolerance of the pipe seat for the insertion circular radial hole opened by the thermal cutting method are clearly stipulated (4.3 and 5.2 of this edition)
This standard is proposed by the China Machinery Industry Federation, and this standard is under the jurisdiction of the National Technical Committee for Boiler Standardization (CSBTS/TC73). This standard is drafted by the Shanghai Industrial Boiler Research Institute. The main drafters of this standard are Qian Fenghua and Tian Yaoxin. Previous versions of the standards replaced by this standard The publication status is: JB1625-1975, JB1625-1983. JB/T1625-1993. 1 Scope
Welded tube holes for industrial boilers
JB/T1625-2002
This standard specifies the tube hole type and hole opening method, tube hole size and manufacturing tolerance of welded tube holes on pressure components of industrial steel furnaces. This standard is applicable to fixed steel steam boilers with a rated working pressure greater than 0.04MPa but less than 3.8MPa and a rated evaporation capacity of not less than 0.1t/h and water as the medium, and fixed steel hot water boilers with a rated water outlet pressure greater than 0.1MPa. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all referenced documents with dates, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all referenced documents without dates, the latest versions are applicable to this standard. GB/T1804-1992 General tolerances Tolerances of linear and angular dimensions without tolerance indication 3 Pipe hole types and hole opening methods
3.1 The type of welded pipe holes on pressure-bearing components shall be plug-in type (Figure 1a)), recessed seat type (Figure 1b)) or riding seat type (Figure 1c))b)
Figure 1 Welded pipe hole types
3.2 Methods for opening welded pipe holes on pressure-bearing components. For plug-in circular radial holes with a nominal outer diameter of not more than 108 mm, mechanical processing shall be adopted; for rows of non-radial holes, mechanical processing is preferred. When thermal cutting is used for hole opening, mold-based thermal cutting or other more advanced thermal cutting methods shall be adopted.
3.3 For the pipe holes on the header connected to the downcomers, if the pipe ends do not have a full-penetration groove, a full-penetration groove shall be opened on the header. However, when the outer diameter of the down pipe is not greater than 108mm and the plug-in connection is adopted, the pipe hole on the header connected to the down pipe can be exempted from beveling. Hole sizeWww.bzxZ.net
4.1 When the plug-in circular radial pipe hole is opened by mechanical processing method, the pipe hole diameter 4 shall be in accordance with Table 1: When the recessed pipe hole is opened by machine plate processing method, the pipe hole diameter d, and d shall be in accordance with Table 1, and the recess depth shall be in accordance with Table 2. 4.2 When the insert-type circular radial hole is opened by thermal cutting method, the pipe hole diameter shall not be greater than the nominal outer diameter of the pipe plus 2mm. 4.3 For the seated pipe hole, the pipe hole diameter is equal to the nominal inner diameter of the pipe. 4.4 The value of the weld leg size K in Figure 1 is recommended to be the value in Table 3. The weld leg size of the down pipe connection weld shall be selected by the designer according to the weld front strength.
JB/T1625—2002
Pipe outer diameter D.
D,≤45
45108
Note: It is the nominal wall thickness of the pipe,
The nominal
outer diameter D of the pipe.
Pipe hole diameter
Recess depth
Pipe hole diameter
Nominal outer diameter D of boiler (boiler filling) or header
Recess depth mold
Unit: mm
Unit: mm
≥1000
Pipe category
Other pipes except drawn pipes
Drawn pipes
Manufacturing tolerance| |tt||Table 3 Welding foot size
Tube wall thickness
JB/T1625—2002
Unit: mm
Welding foot size K
When drilling holes by mechanical processing, the deviation of the hole diameter shall be in accordance with the c grade (rough grade) in GB/T1804-1992, and it is advisable to use positive bias. When drilling holes by thermal cutting, the deviation range of the hole diameter is ±1mm. The surface quality of various types of holes shall meet the following requirements: a)
When drilling holes by mechanical processing, the surface roughness parameter value R of the hole shall not be greater than 25um: When drilling holes by mold thermal cutting, the surface roughness parameter value R of the hole shall not be greater than 50um: When drilling holes by manual thermal cutting, the surface roughness parameter value R of the hole shall not be greater than 100um.
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