Threaded Blind Flange
Pressure rating:Class 150 | 300 | 600 | 900 | 1500 | 2500
Thread standard:NPT (American Standard tapered thread) | BSPT (British Standard tapered thread) | API 5B (Tubing thread)
Monitoring interface:1/2"NPT pressure gauge port · 3/4"NPT drain valve · High-precision sensor threaded hole
- Product Introduction
Products Description
A threaded blind flange is a type of blind flange that is connected by threads and used to seal the ends of pipelines. It achieves a high-strength seal without welding and is particularly suitable for pipeline systems that are not weldable, flammable, or require frequent maintenance.
Manufacturing Process
Raw Materials: A105/LF2 and other carbon steel forgings, which undergo spectral composition analysis (PMI) upon arrival at the factory.
Forging/Casting: High-temperature forging is used to improve the density of the metal structure; precision casting can be used for larger dimensions.
Machining: CNC precision machining of threads, sealing surfaces, and back surfaces, with tolerances conforming to ASME B16.5.
Inspection and Testing: Thread inspection, dimensional inspection, material inspection, and visual inspection; pressure test reports can be provided upon request.
Customization Options
Sizes: 1/2"–24", Class 150–2500
Material Options: A105, A350 LF2, A694 F52/F60
Thread Types: NPT, BSPP, BSPT, G, DIN
Surface Treatments: Galvanized, Powder Coated, Black Oil, Anti-corrosion Coating
Packaging and Transportation
Rust Protection: Rust-preventive oil/galvanized steel + sealed plastic bags.
Structural Protection: Threaded protective caps + layered packaging to prevent thread damage.
Heavy Load Bearing: Reinforced wooden crates/pallets for stable load-bearing capacity.
Transportation Methods: Supports sea, air, and land transportation, with various trade terms (FOB/CIF/DDP).
Why Choose Us
We possess a complete forging and CNC machining process, ensuring consistent precision in thread and sealing surface accuracy.
All flanges are manufactured strictly according to ASME/ASTM standards and undergo 100% thread and dimensional inspection.
We maintain a large inventory of standard specifications, enabling rapid delivery within 7–15 days and stable supply for large volumes.
We support OEM/non-standard customization and have exported to over 30 countries, with quality proven in the global market.
Five irreplaceable core values
|
Advantages |
Technological breakthrough |
Engineering benefits |
|
100% no-weld safety |
Zero sparks from thermal work · ATEX/ISO 80079 explosion-proof certification |
Zero risk of plant start-up and shutdown |
|
Gigapascal seal |
Integral forged form · Class 2500 design · 550MPa burst validation |
Deep well oil production/hydrogenation reactor is absolutely reliable |
|
Quick start and stop in 90 seconds |
Hardened trapezoidal thread · Anti-seizing coating · Single-person hydraulic wrench operation |
The efficiency of emergency isolation has increased by 80% |
|
Dual-channel monitoring |
Optional integrated pressure gauge port + relief valve · Real-time monitoring of pressurized status |
Prevent overpressure accidents · Reduce maintenance costs by 60% |
|
Corrosion lifelong immunity |
625 alloy lining · PREN≥50 · Resistant to 98% concentrated sulfuric acid corrosion |
Strong acid pipeline life ≥20 years |
The world's top technical specifications
1. Core parameter matrix
|
Parameters |
Standard Specifications |
Special Customization |
|
Nominal diameter |
DN15(½")-DN300(12") (316L regular stock) |
DN600(24") Extra-large caliber |
|
Pressure rating |
Class 150 | 300 | 600 | 900 | 1500 | 2500 |
Vacuum 10⁻⁸ Torr |
|
Thread standard |
NPT (American Standard tapered thread) | BSPT (British Standard tapered thread) | API 5B (Tubing thread) |
Left thread/metric thread |
|
Monitoring interface |
1/2"NPT pressure gauge port · 3/4"NPT drain valve · High-precision sensor threaded hole |
Integrated wireless pressure sensor |
2 Structural Innovation details
|
Components |
Military-grade technical solutions |
|
Main structure |
Integral die forging · ANSYS topology optimized wall thickness · No weld stress concentration |
|
Sealing system |
Metal-to-metal hard seal (RJ ring groove/octagonal gasket) |
|
Material options |
316L (Conventional corrosion) | Alloy 625 (ultra-high temperature and high pressure) | C276 (Strong acid) | Titanium alloy (seawater) |
|
enforce standards |
ASME B16.5 | ASME B16.47 | API 6A | ISO 10423 |
|
C276 |
- 198 ~ 400 ℃ |
310 MPa |
DN50: 1200 |
|
625 |
-253°C~760°C |
620 MPa |
DN50: 1500 |
FAQ
Q: What standards does the product meet?
A: Compliant with ASME B16.5, ASME B1.20.1, and ISO 7-1, and compatible with international standard pipe fittings.
Q: What pressure ratings are available?
A: All Classes 150, 300, 600, 900, 1500, and 2500 can be produced.
Q: What thread types are supported?
A: NPT, BSPP, BSPT, G, and DIN threads can all be machined; custom threads are supported.
Q: Can it be customized according to drawings?
A: Yes, outer diameter, thickness, thread depth, sealing surface, and surface treatment can be customized.
Q: What is the MOQ?
A: The MOQ for standard specifications is 50–100 pieces; some specifications are in stock and available for small-batch supply.
Q: What tests are performed?
A: Dimensional, thread, material PMI, and visual inspections; pressure testing can be performed upon request and reports provided.
Q: What is the lead time?
A: Standard sizes take 7–15 days, customized sizes take 15–25 days, and expedited production is available.
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