Metal Pipe Flange
Product Introduction
Metal pipe flanges are critical pressure-bearing components used in industrial pressurized piping systems to facilitate pipe connections, transitions to equipment interfaces, and system sealing; they are widely utilized in high-pressure fluid transport and industrial engineering systems.
These products are designed and manufactured in accordance with internationally recognized standards such as ASME B16.5/B16.47, EN 1092-1, DIN, and JIS, and can also be custom-manufactured to non-standard specifications based on project requirements or client drawings.
Key Technical Features
High-Precision CNC Machining
Critical flange dimensions (outer diameter, thickness, bolt circle diameter) are controlled via precision CNC machining, with typical tolerances maintained within the ±0.1 mm to ±0.3 mm range.
Precision Sealing Surface Finishing
Sealing surfaces are processed using CNC turning or precision machining centers, achieving surface roughness levels of Ra 3.2, 1.6, or 0.8 μm, and are compatible with standard sealing configurations such as RF, RTJ, and FF.
Compliance with International Standards
Products fully meet the requirements of the following standards:
- ASME B16.5 / B16.47 (US Standards)
- EN 1092-1 (European Standards)
- DIN / JIS Industrial Standards
- Customer Project Specifications (EPC / Owner Specifications)
Material Range and Operating Condition Compatibility
Common materials include:
- ASTM A105 (Carbon Steel)
- ASTM A182 F304 / F316L (Stainless Steel)
- Duplex / Super Duplex (F51 / F53)
- Alloy Steel (for high-temperature and high-pressure service)
Applicable Operating Conditions
Temperature: -50°C to 550°C (varies based on material and pressure rating)
Pressure Ratings: Class 150 – 2500 / PN6 – PN420
Service Types: Standard / Corrosive / High-Temperature & High-Pressure / Offshore Environments (subject to project-specific confirmation)
Application Scenarios
① Critical High-Pressure Connections (High-Pressure Systems)
Weld Neck Flange (WN)
RTJ (Ring Type Joint) Flange
Used in high-pressure, high-temperature, and safety-critical systems (Oil & Gas / Refineries)
② Standard Economical Connections (General Industrial Systems)
Slip-On Flange (SO)
Plate Flange (PL)
Used in low-to-medium pressure industrial piping networks and general engineering systems
③ Isolation & Maintenance
Blind Flange (BL)
Used for pipeline sealing, isolation during maintenance, and providing connection points for future system expansion
④ Small-Bore Instrumentation & Control Systems (Instrumentation Systems)
Threaded Flange (TH)
Socket Weld Flange (SW)
Used for instrumentation piping and small-bore, high-pressure control systems
⑤ Systems Requiring Frequent Disassembly (Maintenance-Friendly Systems)
Lap Joint Flange (LJ)
Used in piping systems that require frequent disassembly or alignment adjustments
Customization Capabilities
Standard system customization (ASME / EN / DIN / JIS / Hybrid)
Non-standard design for pressure ratings and dimensions
Flange structural optimization (increased thickness / weight reduction / specialized stress-bearing designs)
Material upgrades (Sour service / NACE MR0175 options available)
Sealing face customization (RTJ / RF / FF / TG / MFM)
Drawing-based manufacturing (CAD / STEP / DWG / PDF)
OEM branding and project coding system support
Support for:
- Sample development
- Small-batch trial production
- Bulk supply for EPC projects
FAQ
Q: Which international standards do your flanges meet? Can flanges from different standards be used together?
A: Our flanges are primarily manufactured according to standards such as ASME B16.5/B16.47, EN 1092-1, DIN, and JIS; we can also customize them based on specific project specifications.
While dimensional systems across different standards are generally not directly interchangeable, we offer solutions to address system compatibility issues in cross-border projects, including:
ASME ↔ EN conversion designs
Non-standard transition flanges
Machining services based on matching drawings
Q: How are flange pressure ratings (Class / PN) selected?
A: Selecting the appropriate pressure rating requires considering the following factors:
Working pressure
Operating temperature (temperature derating)
Material grade
Gasket type
For example:
Class 150: Suitable for low-to-medium pressure industrial systems
Class 300–600: Suitable for medium-to-high pressure piping
Class 900–2500: Used for high-pressure and safety-critical systems
We can provide selection recommendations based on specific project operating conditions.
Q: Q3: Do you provide EN 10204 3.1 Material Test Certificates (MTC)?
A: Yes, all our export flanges come with EN 10204 3.1 Material Test Certificates (MTC), covering:
Chemical composition analysis
Mechanical property testing
Heat treatment batch records (Heat No. traceability)
If project requirements dictate, we can also provide third-party witnessed testing (3.2 / SGS / BV / TUV).
Q: Are the products suitable for high-temperature, high-pressure, or corrosive operating conditions?
A: Yes, provided the materials and standards are correctly matched:
High-temperature conditions: Alloy steel or stainless steel preferred
Corrosive environments: 316L, Duplex, or Super Duplex
High-pressure systems: WN (Weld Neck) or RTJ (Ring Type Joint) flange designs
We can offer recommendations on material and structural optimization based on operating conditions to ensure an adequate safety margin.
Q: How do you ensure dimensional accuracy and sealing performance?
A: We ensure precision through the following methods:
CNC machining (100% control of critical dimensions)
Precision positioning of bolt hole pitch circles
Precision finishing of sealing surfaces (Ra 3.2 / 1.6 / 0.8 μm)
Full dimensional inspection and flatness verification prior to shipment
This ensures accurate alignment during on-site installation and minimizes the risk of leakage.
Q: Do you support non-standard flanges and custom manufacturing based on drawings?
A: Yes, we offer comprehensive OEM/ODM customization capabilities, including:
Non-standard flange dimensions
Special hole spacing or structural designs
Structural optimization (e.g., increased thickness or weight reduction)
Manufacturing based on customer drawings (DWG/STEP/PDF)
Suitable for EPC projects or equipment integration.
Q: Can the products be used for offshore or offshore platform projects?
A: Yes, subject to confirmation of project specifications regarding:
Compliance with NACE MR0175 / ISO 15156
Requirements for Duplex / Super Duplex materials
Requirements for third-party certification (DNV / ABS / BV)
We can provide complete material and inspection solutions compliant with offshore project standards.
Q: How are quality inspections and pre-shipment controls handled?
A: Each batch typically undergoes the following inspection processes:
PMI (Positive Material Identification) spectral analysis
Full dimensional inspection (100% check of critical dimensions)
Non-destructive testing (UT/RT/MT, as required)
Surface and sealing face inspection
Pressure testing (if required by the project)
All inspection records can be archived and provided upon request.
Q: What is the typical lead time? Do you accommodate urgent orders?
A: Lead times depend on specifications and quantities:
Standard parts: Approx. 7–25 days
Bulk orders: Confirmed based on production scheduling
Custom/Non-standard parts: Subject to evaluation of drawing complexity
We support expedited production and split shipments.
Q: Do you support long-term supply arrangements or EPC project partnerships?
A: Yes, we offer:
Annual framework agreements
Phased delivery schedules for projects
Consistent quality control across batches
Dedicated project coding and tracking systems
Suitable for long-term engineering projects and the stable procurement needs of overseas wholesalers.
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