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Why ASME B16.47 Dominates Large-Diameter Systems
In large-scale industrial piping, selecting the correct flange standard is the difference between a secure seal and a catastrophic failure. While ASME B16.5 is the "go-to" for general piping, ASME B16.47 takes over where the other reaches its physical and structural limits.
The primary reason is technical scope. ASME B16.5 covers sizes up to 24" NPS. Once a project requires a Large Pipe Flange (26" to 60" NPS), engineers must transition to ASME B16.47.
Jiangyin Zhonghai Precision Machinery Co., Ltd., an ISO 9001–certified manufacturer with PED/TUV/TS qualifications, specializes in bridging this gap. With a production range extending up to 60" and a maximum dimension of 4 meters, the company provides the precision machining and heavy-duty forging required to meet the rigorous demands of the B16.47 standard.
Key Parameter Comparison: ASME B16.5 vs. ASME B16.47
| Feature | ASME B16.5 | ASME B16.47 |
| Size Range | 1/2" to 24" NPS | 26" to 60" NPS |
| Pressure Classes | 150, 300, 400, 600, 900, 1500, 2500 | 75, 150, 300, 400, 600, 900 |
| Sub-Categories | N/A | Series A (MSS SP-44) & Series B (API 605) |
| Design Intent | General purpose commercial piping | Heavy industrial, high-stress applications |
| Bolt Hole Size | Smaller/Standard | Significantly larger for Series A |
Series A vs. Series B within B16.47
For those requiring large-diameter solutions, the choice often falls between:
- Series A: Thicker, heavier, and uses fewer but larger bolts. Ideal for high-stress industrial environments.
- Series B: Thinner, lighter, with more numerous but smaller bolts. Ideal for compact spaces and commercial applications.
Jiangyin Zhonghai Precision Machinery Co., Ltd. supports both series, utilizing in-house CNC turning and drilling to ensure every component—up to 10 tons per piece—meets the precise geometry required for leak-proof performance.
Frequently Asked Questions (FAQ)
1. Does Jiangyin Zhonghai Precision Machinery Co., Ltd. provide certification for large-diameter flanges?
Yes. As an ISO 9001–certified manufacturer, Jiangyin Zhonghai Precision Machinery Co., Ltd. holds PED, TUV, and TS qualifications. Every flange produced, whether a standard 24" or a massive 60" ASME B16.47 component, undergoes rigorous inspection through our in-house heating, CNC, and testing lines to ensure global compliance.
2. Can I order flanges that don't fit standard ASME dimensions?
Absolutely. While we specialize in ASME, ASTM, JIS, EN, and DIN standards, Jiangyin Zhonghai Precision Machinery Co., Ltd. is a leader in fully customized, drawing-based manufacturing. With a maximum dimension capability of 4 meters, we can produce non-standard forged and machined flanges tailored to your specific project needs.
3. What is the maximum production capacity for a single component?
Jiangyin Zhonghai Precision Machinery Co., Ltd. is equipped to handle heavy-duty industrial requirements, with the ability to produce single-piece forgings weighing up to 10 tons. Our comprehensive facility handles everything from initial forging to final precision CNC drilling, ensuring reliable solutions for both volume production and complex, one-off machined parts.
