Titanium Special Flanges: Orifice, Long Weld Neck and Reducing
Orifice, long weld neck and reducing flanges serve different piping functions. They should not be selected only from outside diameter or pressure class.
Quick Comparison
| Type | Main function | Critical order data |
|---|---|---|
| Orifice flange | Differential-pressure measurement connection | Type, taps, plate, bore, class and line data |
| Long weld neck | Extended hub/nozzle-style connection | Overall length, neck profile, bore and weld end |
| Reducing flange | Connect flange size to a smaller line or bore | Both sizes, transition, hub and flow direction |
Material and Dimensions Are Separate
ASTM B381 may govern titanium forging material. ASME B16.36, ASME B16.5 or an approved drawing may control particular dimensions. The purchase order must identify each applicable document and revision.
Select the Correct Special Flange
Compare Titanium Orifice Flange, Titanium Long Weld Neck Flange and Titanium Reducing Flange.
Related Reading
Orifice Flange RFQ Guide · Long vs Standard Weld Neck · Reducing Flange RFQ Guide
Direct Answer: Which Titanium Special Flange Should Be Selected?
Select an orifice flange for a differential-pressure measurement assembly, a long weld-neck flange for an extended vessel or nozzle connection, and a reducing flange where a larger flange pattern must connect to a smaller bore or pipe size. These forms have different functions and cannot be selected from pressure class alone.
| Flange form | Primary function | Critical RFQ data |
|---|---|---|
| Orifice flange | Supports orifice plate and pressure taps | Tap type/orientation, plate, meter run, jack screws and paired identification |
| Long weld neck | Extended neck for vessel, nozzle or special connection | Neck length/profile, bore, wall, weld end, vessel code and NDE |
| Reducing flange | Connects flange size/class to reduced bore | Flange NPS/class, reduced size, transition, type and mating pipe wall |
Common Specification Requirements
State titanium grade and forging specification, dimensional standard or approved drawing, pressure class, facing and finish, bore, bolt drilling, quantity, service, inspection and documentation. ASTM B381 or ASME SB381 may govern the titanium forging when invoked; the applicable flange dimensions, pressure design and project requirements must be stated separately.
Do not convert one special form into another by machining alone without design approval. Pressure taps, long-neck load transfer and reduced-bore transitions are functional geometry. Coordinate connected pipe, vessel nozzle, gaskets, bolting, weld procedure and corrosion environment.
FAQ
Is an orifice flange a normal flange with tapped holes?
No. It is a coordinated metering assembly with controlled pressure taps, plate, orientation and associated instrumentation details.
Can a standard weld-neck flange replace a long weld neck?
Not automatically. Neck length, wall profile, nozzle reinforcement, weld and NDE requirements differ.
What should an RFQ include?
Provide form, grade, standards, class, sizes, facing, drawing, service, quantity, NDE and certificates.
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