GB/T 21432-2021 in English
VALIDGraphite pressure vessels
- Issued on:2021-03-09
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$418.00
《GB/T 21432-2021石墨制压力容器》由TC262（全国锅炉压力容器标准化技术委员会）归口，TC262SC2（全国锅炉压力容器标准化技术委员会固定式压力容器分会）执行，主管部门为国家标准化管理委员会。
Introduction
Core changes in the standard and technological upgrades
| Technical elements | 2008 edition | 2021 edition | Upgrade points |
|---|---|---|---|
| Temperature range | Undefined lower limit | -70℃~205℃ | Extended low temperature applicability |
| Safety factor | Unified 6.0 | Toxic media 7.0 | Special control of hazardous media |
| Process assessment | Not mandatory | Appendix A/B Mandatory Requirements | Process Control Standardization |
Analysis of Material Technical Requirements
Chapter 5 of the standard clearly states that impermeable graphite materials are divided into two categories: impregnated graphite and pressed graphite. Their physical and mechanical properties must meet the following requirements:
- Tensile strength: ≥26MPa at room temperature (impregnated graphite tube)
- Permeability coefficient: ≤2.9×10-3mm2/s
- Binder shear strength: ≥12.0MPa
Application Case: Hydrogen Chloride Synthesis Furnace
A chemical company uses
Key process control points
1. Impregnation process evaluation (Appendix A)
Impregnation depth and mechanical properties must be verified, including:
- Compressive strength test (GB/T13465.3)
- 205℃ high temperature tensile test
- Process re-inspection every 6 months
2. Bonding operation specifications
| Parameters | Control requirements |
|---|---|
| Ambient temperature | 10-52℃ |
| Relative humidity | ≤90% |
| Seam width tolerance | ≤1mm |
Innovation requirements for inspection and acceptance
Three new mandatory tests are added in the 2021 version:
- Graphite tube water pressure test: 2 times the design pressure for 30min
- Block type heat exchanger pressure test: 1.5 times the design pressure
- Permeability coefficient test: Vacuum decay method (Appendix C)
Acceptance data of a certain project
The DN800 graphite absorber has been subjected to a water pressure test of 1.75 times the design pressure (0.84MPa), and the pressure is maintained for 60 minutes without leakage. The permeability coefficient is measured to be 2.1×10-3mm2/s.
Implementation suggestions and risk prevention and control
- Material traceability: Establish a quality archive for the entire chain of graphite substrate-impregnant-binder
- Process digitization: Automatic recording of curing temperature/time parameters (Article 9.1.3)
- Personnel certification: Bonding workers must be certified before they can take up their posts (Article 7.1.4)
- Special medium protection: Product test pieces should be made for containers of extremely hazardous media (Article 7.8.1)
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