1 Subject Content and Application Scope
This standard specifies the requirements on the manufacturing, inspection and acceptance as well as marking, painting and packing of boiler tube.
This standard is applicable to the stationary hot water boiler and the stationary steam boiler with the rated steam pressure no larger than 13.7MPa and the rated steam temperature no larger than 540℃, in addition, it is also usable to the subcritical pressure steam boiler.
2 Normative References
JB 1612 "Specification for Boiler Hydraulic Pressure Test"
JB/T 1613 "Specification for Welding of Boiler Pressure Parts"
JB/T 1615 "Specification for Painting and Packing of Boilers"
JB 3375 "Receiving Acceptance of Raw Materials for Boiler"
3 Technical Requirements
3.1 Materials and Welding
3.1.1 The materials for boiler tube shall be adopted according to those specified in the related technical documents. The materials for manufacturing the boiler tube shall be in accordance with the requirements of design pattern, and the substitute materials shall be examined and approved according to established procedures.
3.1.2 The steel products and welding materials for manufacturing the boiler tube must pass the receiving acceptance conducted by the inspection department according to those specified in JB 3375, and those that have not conducted with the receiving acceptance or are rejected in the inspection are disallowed to be used in the production.
3.1.3 The welding work of boiler tube shall be in accordance with those specified in JB/T 1613.
3.1.4 When welding parts on the tube, repair welding is disallowed if burnthrough phenomenon happens, and this burnthrough part shall be cut off and installed with the insert tube for re-welding. The length of the insert tube shall be in accordance with those specified in 3.2.3.
3.2 Splicing
3.2.1 As for the water wall, convection bank, connecting tube and the pipelines within the scope of boiler, the total quantity N of the splice welds on the total length L of every tube shall not exceed those specified in Table 1, and the shortest length of the spliced tube shall not be less than 500mm.
Contents
1 Subject Content and Application Scope
2 Normative References
3 Technical Requirements
3.1 Materials and Welding
3.2 Splicing
3.3 Surface Quality
3.4 Heat Treatment
4 Manufacturing and Mounting Tolerances
4.1 Deviation for Edges of Butt Joints
4.2 Gradient of the End Surface of Butt Joint
4.3 Welding Deformations
4.4 Elbow
4.5 Serpentine Tube
4.6 Other Bent Pipe Fittings
4.7 Support Pieces
4.8 Bottling or Flaring
5 Inspection and Acceptance
5.1 Welding Quality Inspection
5.2 Ball-passing Test
5.3 Spectra Inspection
5.4 Hydraulic Test
5.5 Inside Clean
5.6 Quality Certificate
6 Marking, Painting and Packing
6.1 Marking
6.2 Painting and Packing
Additional explanations:
