GB/T 45819-2025 in English
VALIDCentrifugal liquid hydrogen pumps—Technical specification
- Issued on:2025-05-30
- Implemented on:2025-09-01
- File Format:PDF
- Delivery:Via email within 5 business days
$553.00
| Standard No: | GB/T 45819-2025 |
| Document status: | VALID |
| Title in English: | Centrifugal liquid hydrogen pumps—Technical specification |
| Title in Chinese: | 离心式液氢泵 技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2025-05-30 |
| Implemented on: | 2025-09-01 |
| ICS Classification: | 23.080-Pumps |
| Chinese Classification: | J71-Pump |
| Professional Classification: | GB-National Standard |
| Related Keywords: | liquid hydrogen centrifugal pumps
centrifugal liquid hydrogen pumps technical specification introduction analysis liquid hydrogen liquid hydrogen pump liquid hydrogen temperature-pressure correspondence table |
| Related Topics: | Centrifugal pump displacement
liquid center technology Liquid pump centrifugal pressure pump centrifugal pump iso5199 technology Sandwich technology principle Centrifugal pump operating specifications |
《GB/T 45819-2025离心式液氢泵 技术规范》由TC211（全国泵标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Analysis of core technical requirements
| Technical dimensions | Conventional centrifugal pumps | Special requirements for liquid hydrogen centrifugal pumps |
|---|---|---|
| Working temperature | Room temperature~200℃ | -253℃ ultra-low temperature |
| Material processing | Conventional heat treatment | 2 times liquid nitrogen cryogenic treatment (-196℃ insulation for 2-6h) |
| Shaft sealing system | Single end mechanical seal | Cartridge double seal+nitrogen buffer system |
| Vibration control | GB/T 29531 Class C | Class B and above (Class I when speed＞12000r/min) |
Key technical innovations
1. Low temperature adaptability of materials: The standard requires that the pressure shell be made of titanium alloy (F-5/F-6) or austenitic stainless steel (022Cr17Ni12Mo2), and the impact absorption energy at -253℃ should be ≥49J. Actual application cases show that the GH4169 alloy shaft parts that have been cryogenically treated can avoid low temperature brittle cracking.
2. Special structural design: The inducer-impeller system adopts an axial compression and anti-loosening design, and the thread rotation direction is opposite to the pump rotation direction. A certain type of liquid hydrogen pump reduces the cavitation margin by 30% through composite blade design.
Recommendations for the implementation of the standard
- Manufacturing stage: Strictly follow the material grade selection in Appendix C, and the welding process shall be evaluated according to NB/T47014
- Test verification: It is recommended to conduct liquid nitrogen (-196℃) and liquid hydrogen (-253℃) performance tests in steps, referring to the conversion formula in Appendix D
- Safety protection: A hydrogen concentration alarm system (in compliance with GB/T29729) and IP65 protection grade electrical equipment must be configured
Technology evolution analysis
Compared with the 2019 version of the centrifugal pump standard for the petroleum industry, this specification adds:
- Pre-cooling and blowing process flow unique to liquid hydrogen medium (4.1.8)
- Low-temperature clearance control requirements for wear-resistant rings (60%-100% of the standard value)
- Liquid hydrogen temperature-pressure correspondence table (Appendix E) and other hydrogen energy-specific content
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