SH/T 3430-2018 in English
VALIDSpecification for flexible graphite covering wave-serrated gaskets for tubular heat exchanger in petrochemical industry
- Issued on:2018-07-04
- Implemented on:2019-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$456.00
本标准规定了柔性石墨金属波齿复合垫片的材料、设计、制造、检验、验收、运输和包装等方面的要求。
本标准适用于公称压力为1.0 Mpa～6.4MPa,工作温度-196℃～450℃的管壳式换热器管箱、壳体、外头盖法兰和浮头盖用柔性石墨金属波齿复合垫片。
Introduction
Core Technical Requirements of the Standard
| Parameters | Indicator Requirements | Test Standards |
|---|---|---|
| Leakage Rate | ≤1×10-5Pa·m³/s | GB/T 12385 |
| Compression Ratio | 35%-55% | GB/T 12622 |
| Rebound Rate | ≥15% | GB/T 12622 |
| Stress Relaxation | ≤25%(300℃/16h) | 6.2.3 of this standard |
Material Specifications
Metal Frame Materials
The standard specifies eight metal material options, including austenitic stainless steels such as 06Cr18Ni11Ti (code 6) and 022Cr17Ni12Mo2 (code 7). Hardness requirement: ≤217 HBW. For large diameters (>1500mm), cold-formed flat steel is permitted, but the number of welded joints must be ≤2.
Key Points of Structural Design
- Waveform Parameters: Match the wave tooth pitch (2-4mm) and wave tooth depth (0.3-1.0mm) according to the single-side width of the gasket
- Spacer Design: For multi-tube heat exchangers, the spacer and the annular frame must maintain waveform consistency
- Positioning Structure: The thickness of the positioning ring (Type B) is ±0.5mm of the material thickness
Manufacturing Process Control
Typical Process Route
1. Laser cutting of metal frame → 2. Automatic argon arc welding splicing (penetrant testing required) → 3. Vibration aging treatment → 4. Graphite composite (45° overlap) → 5. Three-stage bolt tightening verification
Special Note: Welded joints must be polished flush with the parent material, and the penetration test must pass NB/T 47013.5 Level I.
Background of Standard Implementation
This standard, based on the project approval document No. 217 of the Ministry of Industry and Information Technology [2013], was edited by Sinopec Engineering Construction Co., Ltd. It integrates the relevant requirements of Spiral Wound Gaskets (GB/T 29463.2) and Flexible Graphite Sheets (JB/T 7758.2), and specifically strengthens the following requirements for high-temperature, high-pressure, and corrosive working conditions in the petrochemical industry:
- Long-term performance at 450°C
- Sealing reliability at the splitter plate
- Manufacturing process for large-size gaskets (DN1800)
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