Technical requirements for urea high pressure condenser
1Key Takeaways
The Standard GB/T 10476-2024, titled "Technical Conditions for Urea High Pressure Condenser", was published by the National Standardization Administration Committee on September 29, 2024. This standard is scheduled to come into effect on April 1, 2025. It provides comprehensive guidelines and specifications for the de…
2Expert Interpretation
Comprehensive analysis of the latest technical standard GB/T 10476-2024 urea high-pressure condenser, covering core contents such as design specifications, material selection, manufacturing process, inspection requirements, etc., focusing on comparing the technical upgrade points of the 2004 version of the standard, and providing professional guidance on equipment selection and quality control.
Analysis of the key points of the standard revision
| Technical dimension | Requirements of the 2004 version | New regulations of the 2024 version | Significance of the upgrade |
|---|---|---|---|
| Material standards | Smelting method is not specified | Requires electric arc furnace + external refining/electroslag remelting | Improve material purity |
| Structural design | Gas-liquid distributor is not specified | Technical requirements for 5 types of internals are added | Optimize fluid distribution effect |
| Testing standards | U3 level ultrasonic testing | U2 level testing requirements | Defect detection rate increased by 30% |
Key process control points
Urea grade stainless steel welding specification
According to clause 7.5.3 of the standard, special attention should be paid to:
- Argon purity≥99.99%
- Interpass temperature≤150℃
- Corrosion resistant layer thickness≥3mm
Typical application case
A 520,000 tons per year urea project uses 022Cr25Ni22Mo2N material condenser, and implements the standard requirements:
- Double-sided argon arc welding process
- 560℃ stress relief heat treatment
- Intergranular corrosion rate≤0.164g/(m²·h)
Inspection and testing system
| Test items | Method standard | Qualified index |
|---|---|---|
| Ferrite content | Magnetic method | ≤0.6% |
| Selective corrosion | GB/T 25151.2 | ≤70μm |
| Ammonia leakage test | GB/T 25151.5 | No phenolphthalein discoloration |
Implementation suggestions
1. Material procurement: Require suppliers to provide complete material identification (see Table 13) and intergranular corrosion test report
2. Process control: Establish a welding parameter traceability system to record the following for each weld:
- Current and voltage fluctuation range
- Interlayer temperature monitoring data
- Argon purity certificate
3. Acceptance preparation: Prepare pressure test water with chloride ion <1mg/L according to Clause 8.15