Water-tube boilers - Part 6: Inspection, testing and acceptance
1 Scope
This document specifies the requirements for material inspection, product dimension, forming processing and welding joint appearance inspection, through ball inspection, spectrum inspection, nondestructive testing, mechanical property inspection of product welded joints, hydrostatic test, documents for inspection, end-of-manufacturing data, metal nameplate and mark of pressure elements of water-tube boilers and load-bearing non-pressure elements directly connected with them.
This document is applicable to the inspection, testing and acceptance of such pressure elements of water-tube boilers and the load-bearing non-pressure elements directly connected with them as are defined in GB/T 16507.1.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2652 Tensile test methods on weld and deposited metal
GB/T 2900.48 Electrotechnical terminology of boilers
GB/T 16507.1 Water-tube boilers - Part 1: General requirements
GB/T 16507.5 Water-tube boilers - Part 5: Fabrication
JB/T 3375 Rules for receiving acceptance of materials for boiler construction
NB/T 47013.2 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
NB/T 47013.3 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing
NB/T 47013.4 Nondestructive testing of pressure equipment - Part 4: Magnetic particle testing
NB/T 47013.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47013.10 Nondestructive testing of pressure equipment - Part 10: Ultrasonic time of flight diffraction technique
NB/T 47013.11 Nondestructive testing of pressure equipment - Part 11: Standard practice for X-ray digital radiography
NB/T 47013.14 Nondestructive testing of pressure equipment - Part 14: X-ray computed radiographic testing
NB/T 47013.15 Nondestructive testing of pressure equipment - Part 15: Phased-array ultrasonic testing
NB/T 47016 Mechanical property tests of product welded test coupons for pressure equipment
AQSIQ [2014] No.114 Special equipment catalogue
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 2900.48 and GB/T 16507.1 and the following apply.
3.1
hydrostatic test pressure
pressure applied to the boiler system or pressure components (elements) as required in hydrostatic test
4 Material acceptance
4.1 General requirements
The boiler fabrication unit shall formulate material procurement standards, and conduct receiving acceptance for steel plate, steel tube, structural steel plate (used for the fabrication of flange and web of main girder), steel strip, section steel (with a height of 250 mm and above, or angle steel with an edge width of 250 mm and above), round steel (used for the fabrication of pull rod and hanger rod with diameter of 40 mm and above), forgings, steel castings, iron castings, welding materials (including welding rods, welding wires, flux-cored wire and welding flux) for boilers as per the requirements of such standards.
4.2 Material quality certificate
4.2.1 The material fabrication unit shall provide the material using unit with the quality certificate, which shall be complete and printed with traceable information identification and stamped with the quality inspection seal of the material fabrication unit. At the same time, clear and firm steel stamp or other signs shall be marked at obvious part of the material. When the boiler material procurement unit obtains boiler materials from a unit other than the material fabrication unit, the original quality certificate provided by the material fabrication unit or the copy stamped with official seal of material operation unit and the signature or seal of the responsible person shall be obtained.
4.2.2 The contents of quality certificate shall meet the requirements of corresponding material standards, and the materials shall be rejected if their quality certificate fails to comply with the standards.
4.2.3 The material using unit shall be responsible for the authenticity and consistency of the boiler materials and material quality certificates obtained.
4.3 Receiving acceptance of materials
The boiler fabrication unit shall conduct receiving acceptance for boiler materials according to those specified in JB/T 3375, and only those that pass the acceptance inspection can be used.
4.4 Marking for receiving acceptance and transfer of marks
4.4.1 Materials that pass the receiving acceptance shall be marked as qualified.
4.4.2 Materials that fail to pass the receiving acceptance shall be marked as unqualified and isolated.
4.4.3 The marks of the materials shall be verified during boiler fabrication and shall be transferred in accordance with those specified in GB/T 16507.5.
5 Product dimension, forming process and appearance inspection of welded joints
5.1 The measuring appliances, instruments and meters used for product testing shall be confirmed to be qualified and shall be used within the validity period. The accuracy of measuring appliances and instruments shall meet the corresponding regulations, and their effective range shall be greater than the estimated value of the product to be measured.
5.2 The cold and hot forming and heat treatment during product fabrication shall comply with those specified in GB/T 16507.5, and corresponding records shall be available.
5.3 The finished products shall be tested for their dimensions, and the test results shall comply with those specified in GB/T 16507.5.
5.4 The welded joints of pressure elements (including welded joints between non-pressure element and pressure element) shall be subject to appearance inspection and meet at least the following requirements.
a) The overall dimensions of the weld shall meet the requirements of the design drawings and those specified in process documents;
b) The height of butt weld shall not be lower than the surface of parent metal, and the weld shall smoothly transition with the parent metal, and there shall be no cracks, slag inclusions, arc pits, incomplete fusion and air holes on the surface of weld and heat affected zone;
c) The longitudinal and circumferential welds of boiler drum, water storage tank, header or pipe, and the splicing welds of the seal head shall be free from undercut, and the undercut depth of other welds shall not exceed 0.5 mm, and the total length of undercut on both sides of tube welds shall not exceed 20% of the tube circumference and not exceed 40 mm.
d) Depth of concavity: not greater than 2 mm.
e) Weld flush at the root of start-up (steam-water) separator, water storage tank, header and pipe: not greater than 3 mm.
f) Weld reinforcement of butt weld:
1) Boiler drum, start-up (steam-water) separator, water storage tank, header and pipe: not greater than 15%t and not greater than 4 mm;
Note: t is the nominal thickness of the plate or tube in case of single-sided welding, and the groove depth of front and back sides in case of double-sided welding.
2) Tube: ≤ 3 mm.
g) Connection weld between flat steel and tube:
1) The welding between flat steel and tube shall be continuous without lack of weld;
2) The weld shall be smooth and flat, the transition between the weld and the parent metal shall be smooth, and there shall be no cracks, slag inclusions, arc pits and other defects on the weld surface;
3) The surface of the weld between the flat steel and the tube shall be free from single pores with a diameter greater than 2 mm, and shall be free from dense pores (with more than 3 small holes in a row) or rows of pores (with more than 5 pores in a straight line for any 100 mm of weld);
Foreword i
Introduction v
1 Scope
2 Normative references
3 Terms and definitions
4 Material acceptance
5 Product dimension, forming process and appearance inspection of welded joints
6 Through ball inspection
7 Spectrum inspection
8 Nondestructive testing
9 Inspection of mechanical properties of welded joints of products
10 Hydrostatic test
11 Documents for inspection
12 End-of-manufacturing data, product nameplate and marking
Water-tube boilers - Part 6: Inspection, testing and acceptance
1 Scope
This document specifies the requirements for material inspection, product dimension, forming processing and welding joint appearance inspection, through ball inspection, spectrum inspection, nondestructive testing, mechanical property inspection of product welded joints, hydrostatic test, documents for inspection, end-of-manufacturing data, metal nameplate and mark of pressure elements of water-tube boilers and load-bearing non-pressure elements directly connected with them.
This document is applicable to the inspection, testing and acceptance of such pressure elements of water-tube boilers and the load-bearing non-pressure elements directly connected with them as are defined in GB/T 16507.1.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2652 Tensile test methods on weld and deposited metal
GB/T 2900.48 Electrotechnical terminology of boilers
GB/T 16507.1 Water-tube boilers - Part 1: General requirements
GB/T 16507.5 Water-tube boilers - Part 5: Fabrication
JB/T 3375 Rules for receiving acceptance of materials for boiler construction
NB/T 47013.2 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
NB/T 47013.3 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing
NB/T 47013.4 Nondestructive testing of pressure equipment - Part 4: Magnetic particle testing
NB/T 47013.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
NB/T 47013.10 Nondestructive testing of pressure equipment - Part 10: Ultrasonic time of flight diffraction technique
NB/T 47013.11 Nondestructive testing of pressure equipment - Part 11: Standard practice for X-ray digital radiography
NB/T 47013.14 Nondestructive testing of pressure equipment - Part 14: X-ray computed radiographic testing
NB/T 47013.15 Nondestructive testing of pressure equipment - Part 15: Phased-array ultrasonic testing
NB/T 47016 Mechanical property tests of product welded test coupons for pressure equipment
AQSIQ [2014] No.114 Special equipment catalogue
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 2900.48 and GB/T 16507.1 and the following apply.
3.1
hydrostatic test pressure
pressure applied to the boiler system or pressure components (elements) as required in hydrostatic test
4 Material acceptance
4.1 General requirements
The boiler fabrication unit shall formulate material procurement standards, and conduct receiving acceptance for steel plate, steel tube, structural steel plate (used for the fabrication of flange and web of main girder), steel strip, section steel (with a height of 250 mm and above, or angle steel with an edge width of 250 mm and above), round steel (used for the fabrication of pull rod and hanger rod with diameter of 40 mm and above), forgings, steel castings, iron castings, welding materials (including welding rods, welding wires, flux-cored wire and welding flux) for boilers as per the requirements of such standards.
4.2 Material quality certificate
4.2.1 The material fabrication unit shall provide the material using unit with the quality certificate, which shall be complete and printed with traceable information identification and stamped with the quality inspection seal of the material fabrication unit. At the same time, clear and firm steel stamp or other signs shall be marked at obvious part of the material. When the boiler material procurement unit obtains boiler materials from a unit other than the material fabrication unit, the original quality certificate provided by the material fabrication unit or the copy stamped with official seal of material operation unit and the signature or seal of the responsible person shall be obtained.
4.2.2 The contents of quality certificate shall meet the requirements of corresponding material standards, and the materials shall be rejected if their quality certificate fails to comply with the standards.
4.2.3 The material using unit shall be responsible for the authenticity and consistency of the boiler materials and material quality certificates obtained.
4.3 Receiving acceptance of materials
The boiler fabrication unit shall conduct receiving acceptance for boiler materials according to those specified in JB/T 3375, and only those that pass the acceptance inspection can be used.
4.4 Marking for receiving acceptance and transfer of marks
4.4.1 Materials that pass the receiving acceptance shall be marked as qualified.
4.4.2 Materials that fail to pass the receiving acceptance shall be marked as unqualified and isolated.
4.4.3 The marks of the materials shall be verified during boiler fabrication and shall be transferred in accordance with those specified in GB/T 16507.5.
5 Product dimension, forming process and appearance inspection of welded joints
5.1 The measuring appliances, instruments and meters used for product testing shall be confirmed to be qualified and shall be used within the validity period. The accuracy of measuring appliances and instruments shall meet the corresponding regulations, and their effective range shall be greater than the estimated value of the product to be measured.
5.2 The cold and hot forming and heat treatment during product fabrication shall comply with those specified in GB/T 16507.5, and corresponding records shall be available.
5.3 The finished products shall be tested for their dimensions, and the test results shall comply with those specified in GB/T 16507.5.
5.4 The welded joints of pressure elements (including welded joints between non-pressure element and pressure element) shall be subject to appearance inspection and meet at least the following requirements.
a) The overall dimensions of the weld shall meet the requirements of the design drawings and those specified in process documents;
b) The height of butt weld shall not be lower than the surface of parent metal, and the weld shall smoothly transition with the parent metal, and there shall be no cracks, slag inclusions, arc pits, incomplete fusion and air holes on the surface of weld and heat affected zone;
c) The longitudinal and circumferential welds of boiler drum, water storage tank, header or pipe, and the splicing welds of the seal head shall be free from undercut, and the undercut depth of other welds shall not exceed 0.5 mm, and the total length of undercut on both sides of tube welds shall not exceed 20% of the tube circumference and not exceed 40 mm.
d) Depth of concavity: not greater than 2 mm.
e) Weld flush at the root of start-up (steam-water) separator, water storage tank, header and pipe: not greater than 3 mm.
f) Weld reinforcement of butt weld:
1) Boiler drum, start-up (steam-water) separator, water storage tank, header and pipe: not greater than 15%t and not greater than 4 mm;
Note: t is the nominal thickness of the plate or tube in case of single-sided welding, and the groove depth of front and back sides in case of double-sided welding.
2) Tube: ≤ 3 mm.
g) Connection weld between flat steel and tube:
1) The welding between flat steel and tube shall be continuous without lack of weld;
2) The weld shall be smooth and flat, the transition between the weld and the parent metal shall be smooth, and there shall be no cracks, slag inclusions, arc pits and other defects on the weld surface;
3) The surface of the weld between the flat steel and the tube shall be free from single pores with a diameter greater than 2 mm, and shall be free from dense pores (with more than 3 small holes in a row) or rows of pores (with more than 5 pores in a straight line for any 100 mm of weld);
Contents of GB/T 16507.6-2022
Foreword i
Introduction v
1 Scope
2 Normative references
3 Terms and definitions
4 Material acceptance
5 Product dimension, forming process and appearance inspection of welded joints
6 Through ball inspection
7 Spectrum inspection
8 Nondestructive testing
9 Inspection of mechanical properties of welded joints of products
10 Hydrostatic test
11 Documents for inspection
12 End-of-manufacturing data, product nameplate and marking
