Steel High Pressure Flange

Problems that everyone cares about are solved

1. Non-standard sizes are delivered slowly. Longan has 15,000 types of inventory + CNC fast customization, and real-time inventory query tools are embedded to perfectly solve this problem

2. For high-pressure leakage risks, it has radio frequency plasma sealing surface treatment, making the Steel High Pressure Flange Ra≤3.2μm, efficient sealing.

3. For hydrogen sulfide corrosion failure, we use A182 F55 duplex steel specially designed for H2S environment, which can last up to 720 hours in salt spray test

Industry application scenarios

Nuclear power: ASME III nuclear power certification flange + radioactive sign warning design

Hydrogen energy: hydrogen embrittlement protective coating technology + hydrogen storage tank pressure test data

Oil and gas drilling: anti-sulfide stress cracking (SSC) flange group + offshore platform project case diagram

Customer practice:

▲ Sinopec Zhenhai Refining: Procurement list with 37% cost reduction

▲ Shell Kazakhstan project: 3 years of zero failure record

For industrial-grade Steel High Pressure Flanges that withstand 800°C & 5000 PSI extreme conditions, we need to treat them more carefully. Longan flanges are the first choice for global oil and gas/chemical projects.

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Download PN100-PN800 technical manual (PDF)