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Coupling & Union
Couplings and unions serve small-bore instrument, hydraulic and lubrication systems, and high-pressure lines that need frequent disassembly.
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- Coupling / Half Coupling — full & half, socket-weld or threaded
- Union — 3-piece with swivel nut; iron-to-iron or bronze-to-iron conical seat (gasket-free, high pressure) or flat seat (gasketed, easy service)
- Ratings: 3000LB (matches SCH 80/XS pipe), 6000LB (SCH 160); NPT/PT threads or SW
Typical Order Examples
ASME B16.11 Threaded Union 1" 3000LB NPT Joint Concave-Convex A105
Standards & Equivalence
ASME B16.11 ↔ BS 3799 ↔ GB/T 14383
Size Range
| Common | 1/4" – 3" (DN8 – DN80) |
|---|---|
| Minimum | 1/8" (DN6) |
| Maximum | Standard high-pressure unions up to 4" (DN100); larger connections normally convert to flanges |
Certifications & Audit Standards
- ASTM A105 / A182 forging — residual-element limits, normalizing / solution treatment
- MSS SP-25 marking — heat number & rating stamped, 100% traceability
- CRN for Canadian installations
- PED 2014/68/EU + PED 4.3
- Marine class: ABS · DNV · LR · BV · CCS
Weight Calculation Formulas
Theoretical weights at carbon steel density 7.85 kg/dm³ — multiply by 1.01 for SS304, 1.02 for SS316L.
| Formula (kg) | |
|---|---|
| Variables |