Long Radius High Pressure Pipe Swivel Joint API 16C 1" To 4" 5000 - 20000 PSI

1. Product Overview

The Long Radius Swivel Joint is a high-performance pipeline fitting widely used in the oil and natural gas industry to change pipeline direction while providing flexible movement capability. Unlike short radius designs, the long radius swivel joint features a smooth, large-radius bore that minimizes fluid resistance and turbulence, reduces scouring and erosion on the turn wall, and offers superior flow characteristics-.

Our long radius swivel joints are manufactured from high-strength low-alloy steel with precision heat treatment to ensure uniform metallurgical structure and pressure-bearing capacity. The product features a three-raceway ball bearing design- with nitrided raceway surfaces and built-in steel balls, enabling smooth 360° rotation while maintaining a reliable seal under extreme pressures-. The design incorporates multiple sealing elements to prevent foreign matter ingress, and an automatic pressure-relief grease retention ring prevents pressure accumulation in the raceway cavity should the seal leak.

Both ends can be connected via hammer union or LP internal threads. All products are designed and manufactured in strict accordance with API Spec 16C and NACE MR0175, ensuring full interchangeability with major international brands such as FMC and SPM.

Key features at a glance:

Smooth large-radius bore minimizes fluid resistance and erosion

Three-raceway ball bearing design for smooth 360° rotation

Precision-machined sealing surfaces for leak-proof performance

API 16C compliant – fully interchangeable with major brands

Available for standard and sour (H₂S) service per NACE MR0175

Hammer union or threaded end connections

Wide pressure range: 5,000 – 20,000 PSI

2. Technical Specifications

Note: The long radius design provides a smooth bore that minimizes fluid resistance and offers better erosion resistance compared to short radius designs.

3. Model Numbers & Specifications

Our JH-LR series long radius swivel joints are available in a comprehensive range of sizes, pressure ratings, and end connection configurations:

End connection type key:

M × M: Male thread × Male thread (both ends male)

F × M: Female thread × Male thread

F × F: Female thread × Female thread (both ends female)

Custom configurations, sizes, and pressure ratings available upon request.

4. Long Radius vs Short Radius

Why choose long radius? Long radius swivel joints are preferred for high-pressure and high-flow applications where minimizing fluid shock, reducing erosion, and extending service life are critical-. Short radius swivel joints are typically used where installation space is limited or operating pressures are lower-.

5. Applications

Long radius swivel joints are essential components in high-pressure fluid handling systems across the oil and gas industry. Primary applications include:

Choke & Kill Manifolds – Critical components in well control systems for managing kick and kill operations-

Hydraulic Fracturing (Fracking) – High-pressure fracturing fluid delivery lines where erosion resistance is paramount

Cementing Operations – Cement slurry lines on cementing trucks and service rigs

Well Testing – Test lines and temporary wellhead connections

Drilling Operations – Standpipe and mud circulation systems

Coiled Tubing Operations – High-pressure fluid connections

Acidizing – Acid treatment lines requiring corrosion-resistant materials

Offshore Platforms – Marine and subsea high-pressure applications

Media handled:

Drilling mud (water-based, oil-based)

Fracturing fluids (including proppant-laden slurry)

Cement slurry

Acid solutions

Crude oil and natural gas

Sour gas (H₂S-containing) – with NACE MR0175 compliant materials