TOBO STEEL GROUP CHINA
| Size Range | 1 inch - 24 inch |
| Application | Flow Metering and Measurement |
| Material | Carbon Steel / Stainless Steel |
| Standard | ASME B16.36 |
| Flange Type | Long Weld Neck (LWN) |
| Face Type | Raised Face (RF) |
| Product Name | Long Weld Neck Orifice Metering Flange |
| Pressure Rating | Class 300 - 900 |
| Brand Name | TOBO |
| Model Number | LWN-ORF-300 |
| Certification | ISO 9001:2015, SGS, BV |
| Place of Origin | Shanghai, China |
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Product Specification
| Size Range | 1 inch - 24 inch | Application | Flow Metering and Measurement |
| Material | Carbon Steel / Stainless Steel | Standard | ASME B16.36 |
| Flange Type | Long Weld Neck (LWN) | Face Type | Raised Face (RF) |
| Product Name | Long Weld Neck Orifice Metering Flange | Pressure Rating | Class 300 - 900 |
| Brand Name | TOBO | Model Number | LWN-ORF-300 |
| Certification | ISO 9001:2015, SGS, BV | Place of Origin | Shanghai, China |
| High Light | Long Weld Neck Flange ，Orifice Metering Flange ，Raised Face Flange | ||
The Long Weld Neck Orifice Metering Flange with Raised Face is designed for precise flow measurement in oil, gas, chemical and process piping systems. Featuring an extended weld neck hub and a machined raised face with pressure tap holes, this specialty flange accommodates an orifice plate or flow meter to deliver accurate differential pressure readings for custody transfer and process control applications.
Manufactured to ASME B16.36 dimensional standards, each long weld neck orifice flange is forged from carbon steel or stainless steel to provide the structural rigidity required for stable, repeatable measurement. The elongated hub allows for easier welding and inspection while maintaining alignment of the pressure taps, ensuring the orifice plate is seated accurately for reliable flow data.
| Parameter | Specification |
|---|---|
| Product Name | Long Weld Neck Orifice Metering Flange |
| Standard | ASME B16.36 |
| Material | Carbon Steel, Stainless Steel |
| Pressure Rating | Class 300 - 900 |
| Face Type | Raised Face (RF) |
| Flange Type | Long Weld Neck (LWN) |
| Size Range | 1 inch - 24 inch |
| Application | Flow Metering and Measurement |
A: A long weld neck orifice flange is used to mount an orifice plate for flow measurement. The pressure taps in the flange body connect to a differential pressure transmitter, allowing operators to calculate flow rate from the pressure drop across the orifice plate.
A: A long weld neck flange has an extended hub compared to a standard weld neck flange. This longer hub provides additional reinforcement, improves accessibility for welding, and is commonly specified for orifice metering applications where extra rigidity and stable pressure tap alignment are required.
A: Orifice flanges are manufactured to ASME B16.36, which defines dimensions, tolerances and pressure tap locations. For European projects, equivalent EN standards may apply, and our team can support both specifications.
Long weld neck orifice flanges are machined from forged blanks with close attention to pressure tap location and bore concentricity, since these directly affect flow measurement accuracy. Each flange is inspected to verify tap hole alignment, raised face finish and hub dimensions against ASME B16.36. We also provide material test certificates and, on request, dimensional reports for custody transfer applications.
A: Flow measurement accuracy depends on the orifice plate, pressure tap alignment and transmitter calibration. Our long weld neck orifice flanges are machined to tight tolerances for stable, repeatable pressure readings, supporting measurement uncertainty of around one to two percent in well-maintained metering systems.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
100000-100000000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
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