GB/T 33440-2021 in English
VALIDGeneral requirements for interchangeability of natural gas
- Issued on:2021-12-31
- Implemented on:2022-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
| Standard No: | GB/T 33440-2021 |
| Document status: | VALID |
| Title in English: | General requirements for interchangeability of natural gas |
| Title in Chinese: | 天然气互换性一般要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-12-31 |
| Implemented on: | 2022-07-01 |
| Superseding: |
GB/Z 33440-2016 General requirements for interchangeability of natural gas entering long-distance pipeline network
|
| ICS Classification: | 75.060-Natural gas |
| Chinese Classification: | E24-Natural gas |
| Professional Classification: | GB-National Standard |
| Related Keywords: | natural gas
gas sources unconventional gas gas appliances natural gas introduction analysis |
| Related Topics: | GB/Z 33440
Interchangeability Natural Gas Wobbe Index General effect of air curtain gas GBT33440 GB/T 33440-2021 natural gas Repeatability, interchangeability Natural gas conversion joint setting requirements gb 33440 |
《GB/T 33440-2021天然气互换性一般要求》由TC244（全国天然气标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of core changes in the standard
| Technical elements | 2016 version | 2021 version | Impact of changes |
|---|---|---|---|
| Scope of application | Limited to long-distance pipeline networks | Expanded to conventional/unconventional natural gas | Covering new gas sources such as coalbed methane and shale gas |
| Upper limit of Wobbe index | 53.1MJ/m³ | 53.8MJ/m³ | Adapt to gas sources with higher calorific value |
| Determination of fluctuation range | ±5% recommended value | ≤5% mandatory requirement | Improve interchange stability |
Technical interpretation of key indicators
The Wobbe index is calculated using the formula: W=H/√d, where:
- H: high calorific value (defined in GB/T11062)
- d: relative density (air=1)
The boundary value of the interchangeability box is determined by four vertices:
- A(39.90,53.80) - high calorific value boundary
- D(35.42,42.34) - low calorific value boundary
Implementation and application suggestions
Liquefied Natural Gas (LNG) Blending Case
A receiving station imported LNG with a Wobbe index of 58.2MJ/m³ and transported gas through a blending pipe (W=49.5MJ/m³). It is necessary to ensure that:
- W≤53.8MJ/m³ after mixing
- Relative deviation from the original gas source W≤5%
- Real-time monitoring using a gas chromatograph
Background of Standard Evolution
This revision reflects three major trends:
- Multi-gas source supply pattern: Adapting to the development of unconventional gas such as shale gas
- Increase in imported LNG: Relaxation of high calorific value restrictions
- Improvement of combustion equipment: Improving the adaptability of gas appliances
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