HG/T 2656-1995 Quality classification of steel shell and tube waste heat boilers HG/T2656-1995 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2656-95
26310477
Steel Shell and Tube Waste Heat Boiler
Quality Classification Rules
1995-01-—10 Issued
Ministry of Chemical Industry of the People's Republic of China
1995-05-01 Implementation
Chemical Industry Standard of the People's Republic of China
Quality Classification Rules for Steel Shell and Tube Waste Heat Boiler Subject Content and Scope of Application
HG/T2656-95
This standard specifies the quality classification rules for steel shell and tube waste heat boilers. This standard applies to carbon steel, low alloy steel and stainless steel welded vertical and horizontal shell and tube waste heat boilers (hereinafter referred to as waste boilers) with a design pressure not exceeding 35MPa for chemical and petrochemical use. Reference standards
GB150 Steel pressure vessels
Steel shell and tube heat exchangers
GB3323 Radiography and quality grading of steel fusion welded butt joints Pressure vessel painting, packaging, transportation
JB2536
JB4708 Welding procedure assessment for steel pressure vessels HG/T2388 General rules for quality grading of steel welded pressure vessels 3 Basic requirements for product quality grading
3.1 This standard is the basis for quality inspection by the quality inspection department of the enterprise, and can also be used by the quality supervision and inspection agencies of the state and departments for product quality supervision and random inspection or quality inspection.
3.2 The categories and levels of product quality characteristics shall comply with the provisions of Chapter 4 of HG/T2388. 3.3 Product quality grade assessment shall comply with the provisions of Chapter 5 of HG/T2388. 3.4 When conducting quality inspection on products, the inspected party shall submit relevant information of the inspected products and provide all technical documents and quality management documents of the selected products according to the requirements of the inspecting party. 3.5 Inspection of parts and components that can be performed on products shall be carried out on the products to be inspected. Otherwise, parts and components equivalent to the number of products to be inspected shall be taken from the products in process for inspection.
4 Grading details
The material part shall comply with the provisions of Table 1.
4.2 The welding part shall comply with the provisions of Table 2. 4.3 The assembly part shall comply with the provisions of Table 3. 4.4 The machined part shall comply with the provisions of Table 4. 4.5 The performance test and safety accessories part shall comply with the provisions of Table 5. 4.6 The paint, packaging and factory documents shall comply with the provisions of Table 6. Approved by the Ministry of Chemical Industry of the People's Republic of China on January 10, 1995 and implemented on May 1, 1995
Quality characteristics
Steam drum section
Equipment flange
Heat exchange tube
Rising, lowering
Heading tube
Heading tube
Heading tube
Opening patch
Main bolt
Main nut
Other main
Pressure components
Main seal| |tt||Welding materials
(welding rods, welding
wires, flux
Quality characteristics
category
HG/T2656
Table 1
Quality characteristics of materials
(1) Meet the requirements of Class B
(2) Before feeding, an appearance inspection should be carried out. If necessary, non-photographic inspection should be carried out and corresponding records and reports should be made
(1) Meet the requirements of Class E

(2) With purchase instructions
(2) Reaching C level
(2) With purchase instructions
(1) Material (including
substitutes in accordance with
drawings
samples, GB150 and
"Technical Supervision Regulations for Safety of Pressure Vessels" (hereinafter referred to as "pressure vessel regulations"))
(2) Acceptance and re-inspection are carried out in accordance with the requirements of the "pressure vessel regulations"
( 3) Control the exemption certificate (including marking) with traceability (1) Comply with the requirements of welding process and relevant standards (2) Control according to the requirements of "Specifications" and have corresponding certificates, inspection results, assessment results, inspection methods, and verification of physical objects and certificates (such as material certificates). ||Book, material delivery record, etc.)
Check the actual object
and the certificate
Quality characteristic
Name
Welder qualification
Welding process
Product welding
Test plate, test tube
Shell weld
Internal quality
Pipe butt|||Internal weld
Quality characteristic category
HG/T2656-95
Table 2 Welding
Quality characteristic indicators
Welding personnel must hold valid certificates for the corresponding projects issued by the labor department
have complete welding process assessment and comply with the provisions of JB4708
Product test plates and test tubes preparation and performance test reports must comply with the provisions of GB150, and their control certificates are complete and traceable (1) Non-destructive testing
Meet the requirements of level b, item
(1)
(2) The same part
Repair does not exceed one||t t||(3) 100% X-ray flaw detection level 1 film rate (by number of films) is not less than 85%, local X-ray flaw detection level 1 film rate (by number of films) is not less than
(4) One-time flaw detection pass rate (by number of films) is not less than 94%
(1) Non-destructive testing reaches level b
(1), (2), (3)||tt ||Requirement
(2) The first flaw detection
inspection pass rate
(calculated by film length) shall not
be less than 90%
(L) Non-destructive testing
meets the requirements of level e
(1)
(2) The same part
repair shall not exceed twice
(3) 100% X-ray
flaw detection|level film rate
(calculated by number of films) shall not
be less than 80%, local
X-ray flaw detection! The rate of graded films (by number of films) shall not be less than 90% (4) The qualified rate of one-time flaw detection (by number of films) shall not be less than 90% (1) Nondestructive testing (including random flaw detection) shall meet the requirements of item (1) of grade C (2) The repair of the same part shall not exceed one (1) Nondestructive testing (including random flaw detection) shall meet the requirements of item (1) of grade C (3) ) results
conform to the drawings and
GB150 provisions
(2)The number of repairs for the same part
conforms to
GB150 provisions
(1) Nondestructive testing
(including spot testing) results
conform to the drawings and
GB151 provisions
(2)The number of repairs for the same part
does not exceed two
(3) Radiographic testing|| tt||1-level film rate is not less than 60%
(4) One-time flaw detection
inspection pass rate
(by film length) is not
less than 80%
Inspection method Inspection result
Assessment result
Verification certificate and
Verification welding worker
Technical assessment task
Book and report
Verification certificate
(1) Verification Check the original flaw detection data (2) Conduct random flaw detection when necessary, length 600~900mm (1) Check the original flaw detection data (2) Conduct random flaw detection when necessary, number of joints shall not be less than 6. Name of quality to be tested: Shell A, B type welds Residual height.
Shell A
B type weld
Pipe butt
Weld reinforcement
Pipe butt
Weld width
C, D type
Seam quality
Quality characteristics
Type
HG/T2656-95
Continued Table 2
Quality characteristics index
(1) Weld reinforcement:
Plate thickness 8
Reinforcement e
≤120~1.5
12<≤250~2
8>250~3
(2) Weld reinforcement of the same line| |tt||The difference is not greater than /3
（1）The width of the weld is not greater than
The outer edge width of the groove plus 4
(2) The width and narrowness of the same weld
The difference is not greater than 3
(3) The width and narrowness of the same type of welds is not greater than 5
The wall thickness of the pipe
The outer diameter of the pipe
（1）Meet the requirements of Class B
Article (1)
(2) The weld leg size
Tolerance:
(1)Meet the requirements of Class E
(2) The height difference of the same weld is not greater than
The height meets
GB150
(1) The width of the weld is not greater than the outer edge width of the groove plus 8
(2) The width difference of the same weld is not
greater than 4
(3) The width difference of the same type of weld is not
greater than 7
Reinforcement height:
Pipe thickness
(1) Meet the requirements of Class C
Article (1)
(2) Weld leg size
Tolerance:
Evaluation results
Inspection method Inspection results Excellent
Grade Grade
Weld joint detector
Weld joint detector
|Weld joint detector
Check the original certificate
Cover the outer edge of each side slope
(1)Perform nondestructive testing according to the drawing requirements
(2)The size of the weld leg is allowed
Weld joint detection
Equipment, special measurement
Quality characteristics
Weld joint appearance
Weld joint undercut
Arc scratch
Quality characteristics
Type
Heat exchange tube, ascending and descending tube
and header tube
Joint quality
Welder's stamp
2.16 Heat exchange tube and
header pipe welding
seam surface
non-destructive testing!
2.18 Pressure parts welding
post-heat treatment
main pressure
component welding
welding record
265695
continued table 2
quality index
shall not have cracks, pores, arc pits and
(1) to reach level b,
slag and other defects, and shall not have slag,
spatter and welding arc scratches, etc.
(2) There shall be no grooves, overlaps, sudden protrusions and depressions. The welds of pressure-bearing parts shall not have undercuts. There shall be no arc rubbing. It shall comply with the drawings and the provisions of GB150 and GB151. Arc rubbing on stainless steel heat exchange tubes and high-pressure connecting tubes shall be repaired. (1) When the wall thickness is not more than 10, it shall comply with GB151 Section 4. .3.3. Article regulations
(2) When the wall thickness is greater than 10, in addition to meeting the requirements of Article (1), the misalignment shall not exceed 1
(I) The welds of the main pressure-bearing parts have welder stamps and location diagrams (2) The stamps are clear and the locations are accurate (when the drawings and process regulations do not allow stamping, there should be traceable supporting information) in accordance with the drawings and GB150 regulations
(1) No photo inspection certificate in accordance with the provisions of GB150 (2) There are non-destructive inspection mark location diagrams| |tt||Inspection method
Special tools
Evaluation results
Inspection results are excellent
Grade
Verification certificate
Weld joint detection
Device, steel ball
Check records and
welder qualification
Verification certificate
Or spot check
Verify non-destructive
Flaw detection data,
(3) Clear marking and accurate position (when drawing (1) Have heat treatment process specifications that conform to the drawings (including heat treatment temperature, heating rate, holding time, cooling rate and furnace exit temperature, etc.) (2) Have automatic temperature control measurement records and reports that conform to process specifications (3) The heat treatment records should indicate the location and number of thermocouples, and should have the operator and Inspector's signature (1) Comply with welding procedure specifications (2) Complete and correct records and reports Verification records Quality characteristics Name of filler body roundness 3.2 Shell straightness 3.3 Weld seam layout 3.4 Bright body weld Misalignment 3.5 Filler body alignment weld Shuttle angle |tt||（E）Allowed
3.6 Body and
Joiner box actual
Measured thickness
3.7 Head actual
Micro thickness
Quality requirement
Classification
Conform to the drawing and GB150 provisions
Conform to the drawing and GB150 provisions
HG/T2656-95
Table 3 Group
Quality requirement index
(1) Meet the requirements of Class B
（2）No holes are allowed on Class A welds
Plate thickness (%)
208402
Comply with the drawings and GB150 requirements
and not more than and not more than and not more than and not more than 15
E≤0.18+1and not more than 4
E≤0.1+1.5
and not more than 4.5
Not less than the nominal thickness minus the negative deviation of the steel plate thickness. S0.258g
and not more than and not more than
E≤0.16+2
and not more than 5
copper wire,
Xuan ruler,
(all meet
assessment results
excellent one-combination drawing
grade grade Gejia
quality characteristic name
head shape deviation
3.9head straight edge longitudinal
wrinkle new depth
3.10heat exchange tube and ascending and descending tube after bending
avoid thickness||t 3.11 Roundness and docking position of heat exchange tubes and ascending and descending tubes 3.12 Overall length of shell Length of extension parts Quality characteristics Category 3.14 Flanges and connecting pipes of equipment Flanges and connecting pipes Centerline of flange and main shaft Tilt of connecting pipe flange Position and size of internal parts of heat exchange tubes and tube sheets 3.18 Position of pipe mouth 3.19 Tolerance of shell diameter Tolerance of support size |tt||Pangguo surface mechanical
Damage (after grinding)
HG/T2656-95
Continued Table 3
Quality characteristic index
Conform to the drawing and GB150 Article 10.2.2.3Not more than 1.0
Not more than 1.5
Conform to the drawing and GB151
Conform to the drawing and GB150
Conform to the drawing and GB151
Conform to the drawing and GB151
Conform to the drawing and GB1 50 provisions
Conform to the drawings and GB151 provisions
(1)Conform to the drawings and (1)Conform to the drawings and (1)Conform to the drawings and GB150 provisions
GB150 provisions
(2)The size tolerance is not large
(2)The size tolerance is not large
More than ±3
More than ±5
Conform to the drawings and GB151 provisions
GB150 provisions
Surface damage should be removed by grinding, and the depth, length and shape of the grinding area should conform to the provisions of GB150||tt ||Steel tape measure
Special tools
Thickness gauge
Sample, caliper
Caliper, ruler
Steel tape measure or
Special tools
Thickness gauge
Evaluation results
Quality characteristic name
Flange seal
Surface quality
Joining box pipe seal
Cover quality
Equipment flange
Center circle diameter of bolt hole
Equipment flange
Two adjacent bolt holes Chord length tolerance Equipment flange Chord length of any two bolt holes 4.6 Connecting pipe method Center circle diameter of flange bolt hole 4.7 Connecting pipe method Chord length of any two bolt holes in flange Tolerance and roughness of diameter of tube sheet and multi-hole end cap hole Quality characteristic category HG/T2656--95 Table 4 Machining quality characteristic index tt||Conforms to the drawing, no
scars and has
effective protection measures
Conforms to the drawing, no
radial scars, with
protective measures
Conforms to the drawing and the provisions of GB150
Conforms to the drawing and the provisions of GB150
Conforms to the drawing and the provisions of GB151
Conforms to the drawing, element
Radial penetration scars
scars, with protection indicators
Evaluation results
Inspection method Inspection results Excellent
Visual inspection, rough||tt| | roughness sample
roughness sample
quality property name
tube sheet and multi-hole end hole
bridge width
4.10|main bolts and
bolts with a precision of 6h
main nuts and
nuts with a precision of 6H
4.12 header pipe method
blue thread
4.13 header pipe method
blue thread
quality property category
4.14 Equipment flange
DN>250
Connecting flange
HG/T2656-—95
Continued Table 4
Quality characteristic index
(1) Meet Class B
(2) Allowable minimum
Bridge width (≤
3.5% of the number of holes and
not more than 4)
Meet GB151
Meet the provisions of Article 4.4.4 of GB151
Accuracy, surface roughness, shape and position dimensions, hardness and mechanical properties meet the requirements of the drawing and GB150
Meet the requirements of the drawing and GB150
Meet the requirements of the drawing and GB150
Evaluation results
Inspection results Quick chart
Inspection method Method
Micrometer
Special measuring tool
Hardness tester
Roughness sample
Grade grid
Quality characteristic
Name of property
Purchased matching
Self-made matching
Hydraulic pressure test
Air tightness test
Tube bundle water pressure
Quality waiting
Name of property|| tt||Inside of waste boiler
Cleanliness degree
Rust removal, oil
Paint and mechanical
Processing surface
Factory technology
Quality characteristics
Classification
Quality characteristics
Classification
HG/T265695bzxZ.net
Table 5 Performance test and safety accessories
Quality characteristics indicators
(1) Reaching Class B
(2) The assembly plant has
necessary re-inspection
qualification certificate
(1) Reaching Class C
(2) There is a purchasing statement
With the manufacturer's
quality certificate
With complete design, testing data and qualification certificate (1) Reaching Class B
(2) Without trimming,
passing the first test
Conforming to the drawings and GB150 regulations
Painting, packaging and factory documents
Quality characteristic indicators
No residue and water accumulation, etc.
(1) Conforming to the drawings and JB2536 regulations
(2) Smooth surface, uniform color and beautiful
Conforming to the drawings and JB2536 regulations|| tt||(1> The position and content conform to the drawing, "Container Regulations" and GB150 regulations (2) The handwriting is always clear and beautiful
(1) Complete, complete and correct
(2) Conform to the provisions of GB150 and "Container Regulations" Assessment results
Inspection method Inspection results are excellent
Verification materials
Verification materials
Or actual measurement
Assessment results
Inspection method
Verification materials
Verification materials
Face inspection results
Excellent One-stop letter
Grade level Gejia
5 Product quality inspection summary table
HG/T2658--95
The product quality inspection summary table should be filled in Table 7 and should comply with the provisions of Article B3.5 of HG/T2388. Table 7 Summary of product quality inspection
Quality characteristics
Category
Product quality grade assessment
In actual inspection items
Qualified grade
Unqualified
Product number:
Excellent grade+
Qualified grade
Use the data in Table 7 to compare with Table 3 in HG/T2388 to assess the product quality grade and fill in Table 8. The format should comply with the provisions of HG/T2388.
Manufacturer name
Product name
Product model
Product number
Completion date
Quality
Grade assessment of this product
Table 8 Results of product quality grade assessment
Product drawing number
Factory number
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