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

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HG/T 20584-2011: Technical requirements of fabrication for steel chemical vessels
HG/T 20584-2011
CHEMICAL INDUSTRY STANDARD OF
THE PEOPLE’S 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 whos...