Titanium Threaded Coupling vs Union vs Pipe Nipple
Titanium threaded couplings, unions and pipe nipples may use the same thread family, but they perform different functions in a piping assembly. Selecting by size alone can create a joint that cannot be maintained, has the wrong flow path or lacks a complete pressure-design basis.
What Is the Difference?
| Product | Primary function | Typical connection | Maintenance consideration |
|---|---|---|---|
| Threaded coupling | Joins two externally threaded pipe ends in a straight line | Female thread at both ends | Usually requires rotation or disassembly of adjacent piping |
| Threaded union | Joins two pipe ends with a separable three-piece connection | Threaded ends with a central union joint | Allows disconnection without rotating long pipe sections |
| Pipe nipple | Provides a short externally threaded pipe section between fittings or equipment | Male thread at both ends unless otherwise specified | Length, wall and engagement affect the assembled geometry |
Use the Correct Titanium Fitting Standard
ASME B16.52-2024 specifically covers covered titanium and titanium-alloy forged fittings with socket-welding and threaded ends, including ratings, dimensions, tolerances, marking and material requirements. Thread form and gaging must also be stated; ASME B1.20.1 covers common inch pipe-thread families such as NPT and NPSC. A trade description such as “titanium coupling” does not by itself establish compliance.
Selection Guide
Choose a Coupling for a Permanent Straight Connection
A titanium threaded coupling is suited to a compact straight joint where routine separation is not required. Define full or reducing bore, thread at each end, engagement, grade and pressure-design requirements.
Choose a Union Where Disassembly Is Required
A titanium threaded union provides a separable joint for maintenance or equipment removal. The purchaser must define the sealing arrangement, orientation, compatible mating components and permitted assembly procedure.
Choose a Nipple to Control Spacing and Threaded Reach
A titanium pipe nipple connects two female-threaded ports and establishes assembly length. State outside diameter or NPS, wall, overall length, thread length, end form and traceable source-material specification.
Need a Complete Titanium Threaded-Fitting Package?
Send the grade, product types, sizes, thread standard, quantities, pressure and temperature basis, service medium, sealing requirements, inspection and documents. Review the complete Titanium Threaded Fittings product family.
RFQ Checklist
- Titanium grade and source-material specification
- Coupling, union or nipple configuration
- NPS or outside diameter and wall
- Thread designation, class, end arrangement and gaging
- Overall and engagement dimensions
- Pressure, temperature and process medium
- Surface, cleanliness and anti-galling requirements
- Quantity, MTC, traceability and inspection documents
Related Reading
Continue with How to Specify Titanium Threaded Fittings before preparing the purchase order.