GB/T 51257-2017 in English
VALIDCode for design of low temperature piping of liquefied natural gas
- Issued on:2017-08-31
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$582.00
| Standard No: | GB/T 51257-2017 |
| Document status: | VALID |
| Title in English: | Code for design of low temperature piping of liquefied natural gas |
| Title in Chinese: | 液化天然气低温管道设计规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2017-08-31 |
| Implemented on: | 2018-05-01 |
| Professional Classification: | GB-National Standard |
| Related Topics: | cryogenic liquid phase
liquid phase + low temperature Cryogenic tube cryogenic solution LNG ignition machine natural gas pipeline natural gas liquid pool natural gas cryogenic GBT51257 GB/T 51257-2017 piping design LNG pipeline construction Natural gas pipeline blind plate Pipe insulation specifications and Pipe design specifications for pressure maintenance natural gas pipeline coating Natural Gas Pipeline Pressure Testing Ventilation design specifications Cryogenic instrument design About natural gas pipelines Pipeline Audition Design gbt51257 Balance room design specifications and gb 51257 |
Introduction
Analysis of core clauses of technical specifications
Key design benchmark parameters
| Parameter type | Normal scenario | Extreme scenario | Standard basis |
|---|---|---|---|
| Design pressure | ≥Safety valve setting value | 1.25 times the maximum expected pressure | GB/T 20801.3 ∮3.2.4 |
| Low temperature shock | -100℃ | -196℃ vertical expansion ≥0.38mm | Table 4.2.1, GB/T 229 |
Key technologies for material selection
- Duplex austenitic stainless steel migration method treatment
- Deep cold valve body hardness value Hr≥45
- Corrugated composite gasket covering layer can be folded ≥15,000 times
Brittle metal/easy ice blocking structure
Solutions to typical engineering problems
Pipe support cold bridge elimination technology
In the Zhuhai LNG receiving station project, a combination structure of high-density polyisocyanurate + stainless steel armored support blocks is used to effectively block radial cold conduction. Monitoring data: The temperature difference between the flange sealing surface and the support component dropped from 320℃ to 45℃.
Pre-cooling warning model
const preCoolThreshold = { maxTempGradient: 50, // ℃ coolingRate: 10, // ℃/h fsDetectInterval: 30 // sec } Comparative analysis of process evolution
| Version | Welding process | Improvement of insulation layer | Environmental benefits |
|---|---|---|---|
| 2012 version | Traditional TIG welding | Single-layer rock wool structure | CFC content 1.2% |
| 2023 version | New Cold Metal Transition CMT | Layered PIR Three-layer Composite | Zero ODP Non-combustible Material |
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