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HG/T 20584-2011 English PDF (HGT20584-2011)

HG/T 20584-2011 English PDF (HGT20584-2011)

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HG/T 20584-2011: Technical requirements of fabrication for steel chemical vessels

This Standard, in combination with the specific conditions of steel chemical vessels, is the supplement and concretization of the fabrication part in Steel Pressure Vessels GB 150. The application scope of this Standard, unless otherwise specified, is the same as that of Steel Pressure Vessels GB 150.
HG/T 20584-2011
CHEMICAL INDUSTRY STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
Record number:??J1202-2011
Replacing HG 20584-1998
Technical requirements of fabrication
for steel chemical vessels
ISSUED ON: MAY 18, 2011
IMPLEMENTED ON: JUNE 01, 2011
Issued by: Ministry of Industry and Information Technology of the PRC
Table of Contents
1 Scope ... 6
2 Normative references ... 7
3 Terms and definitions ... 9
4 General ... 10
5 Manufacture used raw materials ... 11
6 Fabrication and forming ... 19
7 Welding and cutting ... 23
8 Post welding stress relief heat treatment ... 31
9 Size tolerances ... 36
10 Bolts and screw holes ... 45
11 Test and examination ... 48
12 Surface treatment, painting, packing and transportation ... 51
Annex A (Informative) Leakage test for pressure vessels by using ammonia ... 54
Annex B (Informative) Leakage test for pressure vessels by using helium . 60 Annex C (Informative) Leakage test for pressure vessels by using halogen . 71 Annex D (Informative) Commonly equipment used anticorrosion painting ... 77 Annex E (Informative) Fundamental standards of bolts, studs and nuts ... 88 Explanation of Provisions ... 90
2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this Standard. For the undated references, the latest edition (including all the amendments) are applicable to this Standard.
?€?Steel Pressure Vessels?€? GB 150
?€?General Purpose Metric Screw Threads - Basic Dimensions?€? GB/T 196
?€?General Purpose Metric Screw Threads - Tolerances?€? GB/T 197
?€?Steel Plates for Boilers and Pressure Vessels?€? GB 713
?€?Double end studs (clamping type) - Product grade B?€? GB/T 901
?€?Designation system for fasteners?€? GB/T 1237
?€?Tolerances for fasteners - Bolts, screws, studs and nuts?€? GB/T 3103.1
?€?Methods of Radiographic Testing and Classification of Radiographs for Steel Castings?€? GB/T 5677
?€?Fasteners - Surface discontinuities - Bolts, screws and studs for general requirements?€? GB/T 5779.1
?€?Fasteners - Surface discontinuities - Nuts?€? GB/T 5779.2
?€?Fasteners - Surface discontinuities - Bolts, screws and studs for special requirements?€? GB/T 5779.3
?€?Rust grades and preparation grades of steel surfaces before application of paints and related products?€? GB/T 8923
?€?General Purpose Metric Screw Threads - Limits of Sizes for the Screw
Threads of Medium Quality and Preferable Plan?€? GB/T 9145
?€?Methods of Liquid Penetrant Testing and Classification of Indication for Steel Castings?€? GB/T 9443
?€?The Methods for Magnetic Particle Testing and for Specifying Quality Levels of Steel Castings?€? GB/T 9444
?€?Specification for Welding of Stainless Steel clad Steel Plate?€? GB/T 13148 ?€?Specification of Design Base for Steel Chemical Vessels?€? HG/T 20580
3 Terms and definitions
In addition to the terms and definitions given in ?€?Steel Pressure Vessels?€? GB 150, for the purposes of this Standard, the following terms and definitions apply. 3.0.1 Simulated post welding heat treatment
USE the testing plate or the materials of testing pieces to simulate all post welding heat treatment processes below the phase transformation point Ac1 and above 480??C experienced by the material during the actual manufacturing process. It is divided into simulated short-period post welding heat treatment and simulated long-period post welding heat treatment.
3.0.2 Simulated short-period post welding heat treatment
USE the testing plate or the materials of testing pieces to simulate one post welding heat treatment period below the phase transformation point Ac1 and above 480??C experienced by the material during the actual manufacturing process.
3.0.3 Simulated long-period post welding heat treatment
USE the testing plate or the materials of testing pieces to simulate all post welding heat treatment processes below the phase transformation point Ac1 and above 480??C experienced by the material during the actual manufacturing process, including one or multi-rework post welding heat treatments. At least one times of post welding heat treatment shall be reserved for the user?€?s future applying.
3.0.4 Vessel axis
It refers to a straight line perpendicular to the reference surface center. 5 Manufacture used raw materials
5.0.1 The raw materials used for the pressure parts of pressure vessels shall meet the following requirements.
1 Requirements of design documents.
2 ?€?Steel Pressure Vessels?€? GB 150.
3 ?€?Specification of Materials Selection for Steel Chemical Vessels?€? HG/T 20581.
4 Corresponding requirements of this Standard.
5.0.2 The materials used for the non-pressure parts of pressure vessels shall meet the following requirements.
1 When the material is welded with a pressure part, its mechanical properties and chemical composition shall be near to those of the material of the
pressure part.
2 Though it is not welded with a pressure part, when it is necessary to use a welded joint, it shall be a steel with a good welding performance.
5.0.3 The manufacturing plant shall, according to the requirements of Article 5.0.1 of this Standard, carry out examination and acceptance, if necessary, reinspection for the incoming materials.
If the performance data of the material required according to Article 5.0.1 of this Standard are incomplete, the manufacturing plant shall carry out reinspection or supplementary examinations. Only after the materials are qualified, can they be put into use.
5.0.4 If the manufacturing organization of materials does not carry out the nondestructive testing according to Article 5.0.1 of this Standard, the manufacturing plant shall carry out the testing for supplement. Unless otherwise stated in the design documents, the nondestructive testing method and its grading for the steels used for pressure parts shall be carried out according to the requirements of Table 5.0.4-1. The qualification grade, if the design has no special requirement, shall comply with the requirements of Table 5.0.4-2 ~ Table 5.0.4-5.
Table 5.0.4-2 -- Qualification grade of ultrasonic testing for steel plates and tubes
Material variety Ultrasonic
Carbon and low-
alloy steel plates
for pressure
vessels
Standard: 4.1 of JB/T 4730.3
Application scope: 6~250mm (in thickness)
Qualification grade: Commonly-used carbon and low-alloy steel plates,
Grade III
The carbon and low-alloy steel plates with a thickness
greater than or equal to 12m for the following pressure
vessel shells shall not be less than Grade II:
Inner-cylinder steel plates and hardened and tempered
steel plates for single-layer and multi-layer high
pressure vessels with p???10.0MPa
Pressure vessels used for holding mediums of
extremely and highly destructive toxicity
Pressure vessels used in wet hydrogen sulfide
corrosion environment
Clad steel plates
Standard: 4.4 of JB/T 4730.3
Application scope: Clad steel plates for pressure equipment whose
substrates are greater than or equal to 6mm in
thickness
Qualification grade: Clad plates for tube plates, Grade I
Clad steel plates for hot-pressed heads and pressure
vessels, Grade II
Commonly-used clad plates, Grade III
Carbon and low-
alloy steel
seamless tubes
Standard: 4.5 of JB/T 4730.3
Application scope: Carbon and low-alloy steel seamless tubes whose
outside diameter is 12~660mm, and wall thickness is
greater than or equal to 2mm
Qualification grade: Grade II (p< 10.0MPa)
Grade I (p???10.0MPa)???
Austenitic
stainless steel
seamless tubes
Standard: 4.5 of JB/T 4730.3
Application scope: Austenitic seamless tubes whose outside diameter is
12~400mm, and wall thickness is 2~35mm
Qualification grade: Grade II (p< 10.0MPa)
Grade I (p???10.0MPa)
Note: ??? The magnetic particle testing for the surface of high pressure seamless steel tubes shall comply with Grade I in 4.9 of JB 4730.4.
in the assessment
frame
the assessment
frame
Austenitic
steel
forgings
for
pressure
vessels
Standard: 4.7 of JB/T
4730.3
Requirements: As above
Quality grading: According
to the
provisions of
JB/T 4728
Table 5.0.4-5 -- Qualification grade of nondestructive testing for castings Material
variety Radiographic Ultrasonic Magnetic particle Penetrant
Carbon
steel
castings
Standard: GB/T 5677
Requirements: The surface of
castings shall
be clean.
According to
the casting
process and
application
conditions, the
critical section
is determined.
Qualification grade: Grade III
Standard: JB/ZQ 6109
Requirements: Heat
treatment
before flaw
detection.
Surface
roughness
Ra???12.5??m
Qualification grade: Grade
III
Standard: GB/T 9444
Requirements:
Delivery
condition; surface
roughness Ra
???25??m
Qualification grade:
Same as that of
the penetrant
testing. Spot,
spot-linear, and
linear
discontinuities
shall not be
greater than
Grade III. No
crack is allowed.
Standard: GB/T 9443
Requirements: Delivery
condition;
surface
roughness
Ra???50??m
Qualification grade:
1) USE a
105mm??148mm
rectangular frame
as the assessment
frame
2) Spot, spot-linear,
and linear
discontinuities
shall not be
greater than Grade
III. No crack is
allowed.
5.0.5 The surface quality of the steel plates for pressure parts shall meet all the following requirements. The surface quality of steel plates used in a
manufactured vessel shall also meet the following requirements.
1 It is allowed that the surface of a steel plate has partial discontinuities such as scratches, roll marks, pocks, and coarseness due to mill scale drops whose depth does not exceed half of the negative thickness tolerance and shall not be less than the minimum allowable thickness.
2 Discontinuities unsatisfactory to the above mentioned depth requirement and any tension fracture, bubble, crack, scab, wrinkle, press-in mill scale, diameters which are at 90?? to each other shall not exceed 0.1% of the
design inside diameter of this section.
2 If the thickness of forgings, in some partial areas, is less than the design thickness, but there is sufficient thickness in the adjacent area around the areas, and the requirements for opening reinforcement according to ?€?Steel Pressure Vessels?€? GB 150 can be met, the forgings are allowed to be used, without undergoing repair welding.
3 It is allowed that the surface of forgings has surface discontinuities such as double skins, scabs, cutter marks whose depth does not exceed either 5% of the nominal thickness or 1.5mm (whichever is smaller) and length does not exceed 20mm (except for the machined surface of the forging).
However, any discontinuities like cracks which are of sharp cut shall be removed regardless of their depth, length, and size.
4 The surface discontinuities which do not meet the requirement of the last item shall be removed through polishing and shall be smoothly transited with the base metal, with a gradient not larger than 1:3.
5 After removing the discontinuities, the residual thickness shall not be less than the design thickness. If the residual thickness is not sufficient, it shall use the method of Item 2 of this Article to carry out reinforcement
calculation. It shall meet the requirements, otherwise repair welding shall be carried out.
6 The repair welding for forgings shall be carried out according to
corresponding requirements of repair welding process. If the depth of
repair welding exceeds 1/3 of the nominal wall thickness or 10mm, or the area of repair welding exceeds 10% of the total area of forgings, the
forgings are not allowed to undergo repair welding.
5.0.7 Requirements of surface quality for the pressure parts of castings. 1 The surface quality of castings shall meet the requirements specified in the drawing.
2 It is allowed that the casting surface has discontinuities (except cracks) of which the depth does not exceed 20% of the nominal wall thickness and
the thickness of discontinuity-free parts is not less than the wall thickness required by the strength design. The length of allowable discontinuities shall meet the requirements of Table 5.0.7.
6 Fabrication and forming
6.0.1 For the materials used for the manufacturing of pressure parts, before cutting or fabrication, their designation shall be transferred. It shall ensure that the transferred designation is correct, clear, and durable. Stainless steel pressure vessels with anticorrosive requirements, on their anticorrosive surface, it shall not adopt embossed stamp and corrosive writing materials for
designation. The pressure parts of low temperature pressure vessels shall not adopt embossed stamp designation.
6.0.2 The hot/cold stamping shall be carried out using mould other than local heating and hammer hitting. For the manufacturing of cylinder?€?s pressure parts, the rolling direction shall be identical to that of plate materials.
6.0.3 For those which meet one of the following conditions, they shall undergo heat treatment after forming, so as to remove fabrication stress and improve plasticity.
1 Where the deformation rate of cold/warm-formed cylinders (austenite
stainless steel: 15%, carbon and low-alloy steels and other materials: 5%) or the thickness ??s of steel plates meets the following conditions.
1) The thickness of carbon and Q345R steels is not less than 3% of the
cylinder?€?s inside diameter Di;
2) The thickness of other low-alloy steels is not less than 2.5% of the cylinder?€?s inside diameter Di;
3) The thickness of austenitic stainless steels is not less than 15% of the cylinder?€?s inside diameter Di.
2 The heads which meet one of the following conditions shall undergo heat treatment after forming.
1) The carbon and low-alloy steel cold-formed heads shall undergo heat
treatment. When the manufacturing organization guarantees that the
cold-formed material property meets the design and utilization
requirements, and it is approved by the design organization, heat
treatment may be omitted;
2) The deformation rate of cold-formed austenitic stainless steel heads is greater than 15%.
The deformation rate of fabrication for steel plates shall be calculated according to the following method:
6.0.5 Heat treatment for materials.
1 Steels used in hot rolling conditions, after their hot-fabrication finished, may generally be used during fabricating.
2 Steels used in normalized conditions, provided the final temperature of hot- fabrication can be controlled to be higher than the normalizing temperature of the steel or the test plate after hot-fabrication is judged as qualified, may not undergo the subsequent normalizing treatment.
3 For steels used in normalizing+tempering conditions, if the above-
mentioned requirements for normalized steels can be met in the process
of hot-fabrication, after the hot-fabrication, it may only be tempered. 4 Steels used in quenched and tempered conditions, after their hot-
fabrication finished, shall generally undergo quenching and tempering.
5 For austenitic stainless steels, the final temperature of the hot-fabrication shall be controlled above 850??C. After the fabrication, the steels shall be rapidly cooled (e.g. blow or water spray cooling). If the materials are required to undergo intergranular corrosion tendency test, after hot-
fabrication, they shall be reassessed. If the intergranular corrosion test requirements are not met after hot-fabrication, it shall carry out solution or stabilizing treatment.
6.0.6 The hot-fabrication for austenitic stainless steels shall meet the following requirements.
1 Before heating, oil stains and other attachments shall be thoroughly
removed from the surface.
2 In the heating process, it shall not directly contact with the flame or solid fuel; the heating temperature shall be uniform.
3 The furnace atmosphere shall be controlled to be of neutrality or micro- oxidizability. Attentions shall be drawn to the sulfur content of furnace atmosphere, to prevent the corrosion of sulfur on stainless steel.
6.0.7 The surface of stainless steel equipment, during fabricating, shall be prevented from scratches. The stainless steel surface shall also be prevented from iron contamination caused by fabrication appliances according to ?€?Detailed Management Rules for Manufacturing of Austenitic Stainless Steel Pressure Vessels?€? HG/T 2806. Tools used for carbon steel pieces, such as abrasion wheel, shall not be applied to stainless steel equipment.
6.0.8 Subplate and reinforcing plate on shells shall be provided with at least 1 7 Welding and cutting
7.1 Cutting
7.1.1 When using flame cutting for blanking, it shall remove slags and
detrimental impurities, and use abrasion wheels or other tools to fabricate the grooves to be flat and smooth, until they expose metallic luster. When the materials to be cut are high strength steels or chrome-molybdenum alloy steels whose lower limit of tensile strength is larger than or equal to 540MPa as specified in the standard, it shall use polishing or machining method to remove the heat affected zone and quenched zone from the surfaces of flame cutting, and shall carry out magnetic particle or penetrant testing.
The cutting of stainless steels is not allowed to adopt carbon arc air gouging, shall adopt mechanical method or plasma cutting.
7.1.2 The necessity to preheat for flame cutting shall comply with the preheating requirements for steels welding.
7.1.3 For the gas cutting of pressure parts, their opening edges and blanking end of shearing (the opening edge of abutting nozzle or the end of inward extended nozzle) shall be formed by means of polishing and grinding and shall expose metallic luster.
7.2 Weld position
7.2.1 The openings on a shell shall avoid welds and their neighboring areas as much as possible unless one of the following cases is met.
1 Openings which meet the opening reinforcement requirements of ?€?Steel
Pressure Vessels?€? GB 150 are allowed to be in weld areas.
2 Openings which are allowed to omit separate reinforcement as specified in ?€?Steel Pressure Vessels?€? GB 150 are allowed to be in circumferential weld areas. However, at this time, the welding joints within a circle, which is centered at the opening center in a radius of 1.5 times of the opening
diameter, shall undergo 100% radiographic or ultrasonic testing and meet the requirements. Welds which may be removed due to openings may be
free from the influence of nondestructive testing quality.
3 For the openings which are allowed to omit separate reinforcement as
specified in ?€?Steel Pressure Vessels?€? GB 150, when the shell plate is less than or equal to 40mm in thickness, the distance between the opening
edge and the main weld edge shall be larger than or equal to 13mm.
However, if the main weld meets relevant requirements after undergoing
7.4 General requirements for welding
7.4.1 Welding generally adopts electric-arc welding. Unless otherwise specified in the design documents, the welding consumables ...

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