For **procurement managers & technical directors** who need precision flow-measurement flanges without long lead times or inflated intermediary costs. Our threaded orifice flanges deliver ±0.5% flow-measurement accuracy with NPT/BSPT threads, ASME-class pressure ratings, and guaranteed export-ready compliance.
✅ ISO 9001:2015 | ASME B16.36 | CE | FDA | RoHS
For **procurement managers & technical directors** who need precision flow-measurement flanges without long lead times or inflated intermediary costs. Our threaded orifice flanges deliver ±0.5% flow-measurement accuracy with NPT/BSPT threads, ASME-class pressure ratings, and guaranteed export-ready compliance.
🚛 MOQ: 5 pcs | ⏱ Delivery: 10–18 days | 🌍 Shipped to 20+ countries (USA, Europe, Middle East)
💸 High Pre-Engineered Costs
“We were quoted $280–$420 per flange from a US distributor. Booking direct from Weihuan cut landed cost by 37%.”
— Refinery Procurement Engineer, Texas
🕒 6–8 Week Lead Time ⏳
The average lead time in the 2025 US industrial supply chain for specialty flanges was 47 days. Our factory-direct production cycle: 12 days for standard threaded orifice flanges.
⚖️ Quality Inconsistency
Threads not conforming to ASME B1.20.1, pressure-tap misalignment, and missing impact certificates are common when buying from non-specialist trading companies.
🚢 Broken Promises on Logistics
Opaque shipping quotes, port delays, and undocumented crating. We offer incoterms 2020 (FOB, CIF, DDP) with pre-shipment inspection.
A threaded orifice flange (sometimes called a “threaded flow flange”) integrates a precision-bored orifice plate between two flange halves. Unlike welded assemblies, the threaded design uses NPT or BSPT female threads to connect directly onto pipes, simplifying installation and eliminating hot-work permits. These flanges are used in flow-measurement systems to measure the pressure drop across the orifice plate per the ISO 5167 / ASME MFC-3M standard.
| Parameter | Specification |
|---|---|
| Design Standard | ASME B16.36, ISO 5167, DIN 19214 |
| Size Range | 1/2" (DN15) → 24" (DN600) |
| Pressure Classes | Class 150, 300, 600, 900, 1500, 2500 |
| Thread Types | NPT (ASME B1.20.1), BSPT (ISO 7-1), BSPP |
| Orifice Tappings | 2 × 1/2" NPT taps, radially opposed, ±0.5° alignment tolerance |
| Pressure Tap Type | Corner taps, flange taps (ISO 5167-2) |
| Face Styles | RF (Raised Face), FF, RTJ |
| Gasket Ring | CS, SS304/316 spiral wound gasket |
📎 Looking for a custom orifice β ratio or specific flush tappings? Email whxs@weihuantube.com — our engineering team responds within 8 business hours.
Every threaded orifice flange is supplied with EN 10204 3.1 material test certificate, dimensional inspection report, and (optionally) PMI test documentation. For EU-regulated environments, our flanges are available with CE-PED certification & UKCA documentation for UK compliance.
Using the decision matrix method from the Cureus Journal of Engineering 2025 paper on rigid flange coupling materials, we evaluate mechanical strength, corrosion, thermal stability, and cost. Below are the standard material options we supply for threaded orifice flanges.
| Material Grade | Max Temp (F) | Corrosion Resistance | Typical Use Case | Relative Cost |
|---|---|---|---|---|
| ASTM A105 (Carbon Steel) | -20°F to 800°F | Good (with coating) | Steam, water, oil & gas | $ (baseline) |
| A350 LF2 (Low Temp CS) | -50°F to 700°F | Good (impact tested) | Arctic / cold climate pipelines | $$ |
| A182 F304/F316 (Stainless Steel) | -325°F to 1200°F | Excellent | Chemicals, food, seawater | $$$ |
| A182 F11/F22 (Alloy Chrome-Moly) | Up to 1200°F | High temp oxidation | High-temp steam, refineries | $$$$ |
| Duplex S32205 (Duplex SS) | -50°F to 600°F | Superior (CL- stress crack) | Offshore, brackish water | $$$$$ |
⚙️ According to the Cureus 2025 findings, over-specifying materials raises costs by 20–35% without extending service life. We help you select the right grade for your operating conditions — ask us for our material selection matrix.
💡 Hot tip: For saturated steam service up to 150 PSI, A105 carbon steel performs reliably and is the global cost-efficient choice. For sour service (H₂S), use A350 LF2 or F316 per NACE MR0175.
Threaded orifice flanges are deployed on gas lift metering and chemical injection lines where disassembly for orifice plate inspection is frequent. A 4" Class 900 threaded RF flange with 1/2" NPT taps allows easy transmitter isolation without welding.
For aggressive demineralized water or dilute acid service, a 316 SS threaded orifice flange with Fluorinated EPDM gasket provides exceptional longevity. Recent fertilizer plant order: 34 × 3" Class 150, F316L, delivered in 14 days.
Threaded orifice flanges reduce installation time in cramped mechanical rooms. A 2" Class 150 A105 model with dual pressure taps can be installed in 22 minutes by two fitters, compared to 2.5 hours for a welded orifice union.
0.38%
Typical flow measurement error with proper flange alignment
40%
Installation time saved vs welded orifice flange
1,500+
Threaded orifice flanges exported in 2025
24h
RFQ response time, with lead-time guarantees
→ Submit your P&ID / datasheet for a custom dimensional proposal
💹 Wholesale Price Indicator (2026)
| 2" Class 150 A105 | $28–$35 |
| 4" Class 300 A105 | $52–$68 |
| 6" Class 600 F316 | $145–$179 |
| 12" Class 150 RF | $185–$240 |
| Rush Tooling fee | Waived (for new OEM) |
*FOB Tianjin/Xingang port, subject to qty & material cert. Request a formal quotation.
*Real WhatsApp & email exchanges with procurement managers. Sensitive info blurred.
Since 2012, Cangzhou Weihuan has exported pipe fittings & flanges to the USA, Russia, Canada, Kazakhstan, Algeria, Middle East, South Asia, Africa, and Europe.
Our MOQ is 5 pieces per size/rating for standard A105 / F316 materials. For OEM projects (custom β ratio, special taps) the MOQ is 10 pieces but design consultation is free.
Yes. Standard is two 1/2" NPT taps at 0° and 180°. We can machine at 45°, 90°, or any custom angle. Additional taps, e.g., 3-tap for redundant transmitters, are also available.
We use CNC thread milling with ring gauge verification on every production lot. Each flange is checked with a L1/L2 NPT ring gauge for tightness & fit. Our pass rate in 2024 customer inspections was 99.7%.
A production run of 1500 pcs typically takes 25–30 days + shipping (sea: 20–35 days to the US / 15–25 to Europe). Air freight on request (DHL/FedEx).
Yes. We supply the matched orifice plate in SS304/316 (β ratio 0.2–0.75) with a corresponding RF gasket as standard. Monel® or Inconel® plates are optional (extra cost).
Yes, every flange comes with an EN 10204 3.1 material certificate and a dimensional inspection report. PMI (positive material identification) can also be performed for each heat. Third-party inspections (BV, SGS, TÜV) are available on request.
We use heavy-duty plywood crates with internal bracing for flange sets. If damage occurs in transit, we file the freight claim with you and re-ship replacements on a priority basis or refund at your decision. Mitigation is part of our contract.
“Ordered 120 pcs of 4" Class 600 threaded orifice flanges for a gas compressor station. Taps aligned perfectly, threads gauged smoothly. We saved ~35% vs our old distributor.”
★★★★★
“The custom β ratio for our water injection skid was handled flawlessly. They provided 3D drawings within 3 days and delivered 30 days earlier than the quoted date.”
★★★★★
“We work in a harsh environment. The F316 duplex option and coating quality has been very consistent across three orders. Highly recommended for high humidity regions.”
★★★★★
✍️ David Chen — Senior Piping & Flow Measurement Specialist
David has over 16 years of experience in flange, fitting, and flow element engineering at Cangzhou Weihuan Pipeline Equipment Co., Ltd. He advises on more than 60+ international piping projects annually and is an active contributor to technical discussions on piping stress and flow measurement. He is passionate about helping engineers select the right products for the right service.
Limited-time: Free sample with your first order over 50 units. Use the quick form and our team will reply within 8 business hours with a FOB/CIF price and production timeline.
📧 Email: whxs@weihuantube.com
🏭 Cangzhou Weihuan Pipeline Equipment Co., Ltd. — Middle section of National Highway 338, Mengcun Hui Autonomous County, Cangzhou, Hebei, China
We reply to all inquiries within 8 business hours, Monday–Friday (UTC+8).
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