Swivel Joints | DEENPU Machinery

Swivel Joints

DEENPU high-pressure swivel joints deliver 360-degree rotation in one through four planes for flexible well service piping and manifold connections. Precision ball bearing design with uniform bore minimizes erosion and maximizes service life at pressures up to 15,000 PSI.

Up to 15,000 PSI
2″ – 4″ Sizes
360° Rotation
1-4 Planes
1502 / 1002 Union

Product Overview

DEENPU Swivel Joints are essential components in high-pressure well service piping systems, providing the rotational flexibility needed to align equipment, absorb vibration, and accommodate movement during critical operations such as hydraulic fracturing, well testing, cementing, and flowback. Manufactured from the highest quality alloy steel forgings and machined on state-of-the-art CNC equipment, DEENPU swivel joints deliver reliable performance under the most demanding conditions.

Each DEENPU swivel joint features a precision ball bearing design that allows smooth, continuous 360-degree rotation around one or more axes. The advanced ball bearing system minimizes friction, reduces wear, and maximizes load capacity while maintaining tight seal integrity under full rated pressure. The heavy wall thickness under the ball races provides additional erosion allowance at the critical wear zone without sacrificing flow bore diameter.

A key design advantage of DEENPU swivel joints is the uniform bore diameter maintained throughout the entire swivel assembly. Unlike conventional swivels with abrupt changes in internal diameter, the DEENPU design ensures a smooth, consistent flow path from inlet to outlet. This eliminates turbulence zones and local velocity increases that accelerate erosion and cause premature failure in high-velocity, abrasive flow conditions.

How It Works

DEENPU swivel joints consist of a male and female body section connected by a precision ball bearing race assembly. The ball bearings permit relative rotation between the two body sections while maintaining alignment of the internal flow bore. A field-proven packing system with an anti-extrusion ring provides the dynamic seal that contains pressure while allowing rotation.

When the swivel joint is rotated, the ball bearings roll within the precisely machined races, carrying the radial and axial loads while minimizing friction. The bearing geometry is optimized to distribute loads evenly across the race surfaces, preventing point loading and extending bearing life. The bearing housing is protected by an environmental O-ring seal that excludes dirt, sand, and corrosive fluids from the critical bearing surfaces.

Swivel joints are installed at strategic points in well service piping and manifold systems where flexibility is needed. Common applications include connections between pump trucks and wellhead manifolds, connections to well testing separators, cementing unit connections, and coiled tubing standpipes. Multiple swivels can be combined in series to provide rotation in multiple planes, enabling complex routing configurations.

Key Features

Field-Proven Packing System

Low-friction packing with an anti-extrusion ring provides excellent seal ability and reliability under dynamic conditions. The packing system is designed for long service life and can be replaced in the field using standard tools, minimizing maintenance downtime.

Environmental O-Ring Seal

A secondary O-ring seal protects the ball bearing housing from the external service environment, preventing ingress of sand, drilling fluids, and corrosive media that would otherwise accelerate bearing wear and reduce service life.

Advanced Machining & Bending

Manufactured on high-performance CNC machining centers with six-sigma quality control. The advanced bending and machining process creates a uniform bore throughout the entire swivel, eliminating erosion-prone turbulence zones and maximizing flow capacity.

Precision Ball Bearing Design

The optimized ball bearing geometry minimizes stress concentration at the ball races while maximizing load capacity. This design provides smooth rotation under full working pressure and accommodates the cyclic loading typical of well service operations.

Heavy Wall at Ball Races

Thicker wall thickness at the high-erosion ball race area provides additional material allowance for wear without reducing the internal flow bore. This design extends the erosion life of the swivel and maintains consistent flow performance throughout the service life.

Multiple Styles & Configurations

DEENPU swivel joints are available in a multitude of styles providing 360-degree rotation in 1 through 4 planes. Standard end connections include 1502 and 1002 hammer unions, with custom connections available upon request.

Swivel Joint Styles

DEENPU swivel joints are available in multiple configurations to match your piping and manifold requirements. The style designation indicates the number of rotational planes and the end connection arrangement.

Style 10 – Single Plane (M x M)

Style 10 swivels provide rotation in a single plane with male x male end connections. This is the most common style for straight-line piping where alignment adjustment is needed in one direction. The U-bend configuration shown in the product image above is a typical Style 10 application.

Style 20 – Single Plane (F x F)

Style 20 swivels provide single-plane rotation with female x female end connections. Ideal for connecting between female-threaded components or for creating a female termination point in a piping system.

Style 30 – Single Plane (M x F)

Style 30 swivels provide single-plane rotation with male x female end connections. This style is commonly used as a transition piece between male and female components in a manifold assembly.

Style 50 – Two Planes

Style 50 swivels provide rotation in two perpendicular planes, offering greater flexibility for complex piping layouts. Two-plane swivels are ideal for connecting equipment that may move in multiple directions during operation.

Style 60 – Three Planes

Style 60 swivels provide rotation in three planes, delivering maximum flexibility for intricate manifold configurations and applications requiring multi-directional alignment compensation.

Style 80 – Four Planes

Style 80 swivels provide rotation in four planes, offering the ultimate in piping flexibility. These are used in the most demanding applications where equipment positioning requires alignment adjustment in all directions.

Custom configurations combining different styles in series are also available. Contact DEENPU engineering for assistance with complex piping layout design.

Dimensions & Specifications

DEENPU swivel joints are manufactured to precise dimensional tolerances to ensure reliable interchangeability and proper fit in field assemblies. The following dimensions apply to standard Style 10 (M x M) configurations. Dimensions for other styles are available upon request.

Size	M.A.W.P.	A	B	C	D	E
2″ 1502	15,000 PSI	10.94″	10.69″	5.50″	11.19″	21.63″
3″ 1502	15,000 PSI	14.50″	16.37″	7.88″	12.62″	30.87″
4″ 1002	10,000 PSI	16.00″	17.75″	8.50″	14.25″	33.75″
4″ 1502	14,000 PSI	19.07″	20.95″	10.03″	17.19″	40.02″

All dimensions are approximate and subject to final engineering confirmation. Custom dimensions and configurations available upon request.

Dimension Reference Legend

A: Overall vertical height from centerline of bottom connection to centerline of top connection
B: Center-to-center distance between end connections
C: Bend radius of the elbow section
D: Overall length from end of one connection to end of opposite connection
E: Overall extended length along the pipe axis

Applications

DEENPU Swivel Joints are essential components in a wide range of well service and production operations:

Hydraulic Fracturing

Flowback Operations

Well Testing

Cementing

Coiled Tubing

Well Cleanout

Pump Truck Connections

Manifold Flexibility

Workover & Completion

Technical Specifications

Parameter	Specification
Maximum Allowable Working Pressure (M.A.W.P.)	Up to 15,000 PSI (103.4 MPa)
Nominal Sizes	2″ (50.8 mm), 3″ (76.2 mm), 4″ (101.6 mm)
End Connections	1502 / 1002 Hammer Union
Rotation Planes	1 to 4 planes
Rotation Range	360 degrees per plane
Body Material	AISI 4130 / 4140 Alloy Steel
Bearing Type	Precision Ball Bearing
Packing Material	HNBR / PTFE with Anti-Extrusion Ring
Environmental Seal	O-Ring
Temperature Class	P to U

Materials of Construction

Component	Material
Swivel Body (Male)	AISI 4130 / 4140 Alloy Steel Forging
Swivel Body (Female)	AISI 4130 / 4140 Alloy Steel Forging
Ball Bearings	Hardened Alloy Steel
Bearing Races	Hardened Alloy Steel
Packing	HNBR / PTFE
Anti-Extrusion Ring	PTFE / PEEK
Environmental O-Ring	HNBR / FKM
End Connections	Forged AISI 4130

Ordering Guide

To request a quotation or place an order, please specify the following information:

Size & Pressure

Nominal size (2″, 3″, or 4″), desired working pressure (10,000 PSI or 15,000 PSI), and end connection type (1002 or 1502).

Style & Configuration

Swivel style (Style 10, 20, 30, 50, 60, or 80), number of rotation planes required, and any special bend radius or centerline offset requirements.

Quantity & Delivery

Indicate desired quantity and required delivery timeline. Standard lead time is 4-6 weeks; expedited options are available.

Custom Manufacturing

Beyond standard configurations, DEENPU offers fully customized swivel joint solutions to meet unique operational requirements:

Custom Bend Radii

Non-standard bend radii and centerline offsets can be engineered to match specific piping layout constraints or equipment connection requirements.

Special Materials

Available in stainless steel, duplex stainless steel, and super duplex materials for highly corrosive environments including high CO2 and chloride service.

Custom End Connections

Flange connections, hub connections, threaded connections, and mixed connection types (e.g., male inlet / flange outlet) can be accommodated to match your existing piping system.

Quality Control & Testing

DEENPU maintains ISO 9001:2015 certified quality management systems. Every swivel joint is subjected to the following quality assurance before shipment:

Material & Dimensional Inspection

100% chemical composition and mechanical property verification on all pressure-containing forgings. Positive Material Identification (PMI) testing. Critical dimensions including bore diameter, ball race geometry, and thread profiles verified against engineering drawings.

Pressure Testing

Individual swivel tested at 1.5x rated working pressure for shell integrity. Seal test at rated pressure with nitrogen gas to verify bubble-tight packing performance. Rotation test under pressure to confirm smooth bearing operation.

Functional Verification

Full 360-degree rotation test to verify bearing smoothness and packing integrity. Minimum of 10 complete rotation cycles under no-load and pressurized conditions. Visual inspection of all surfaces for defects, corrosion, or damage.

Frequently Asked Questions

How often should the packing be replaced? ▼

Packing replacement frequency depends on operating pressure, rotation frequency, and service fluid characteristics. In typical well service applications with moderate rotation cycles, DEENPU packing should be inspected every 6 months and replaced annually. For high-frequency rotation applications such as pump truck connections, more frequent inspection (every 3 months) is recommended. Signs that packing replacement is needed include increased leakage at the swivel joint, increased rotation resistance, or visible wear on the packing material. DEENPU provides packing replacement kits with detailed procedures for field-level maintenance.

Can swivel joints be used in sour gas service? ▼

DEENPU swivel joints can be configured for sour gas service with appropriate material selection and packing specifications. For H2S environments, we recommend specifying NACE MR0175 compliant materials with controlled hardness (maximum HRC 22 for pressure-containing components) and H2S-resistant packing materials (FFKM or specialized HNBR formulations). Standard swivel joints are manufactured from AISI 4130/4140 alloy steel with HNBR packing, which is suitable for most standard well service applications. Please provide your H2S concentration and operating conditions for our engineering team to recommend the appropriate configuration.

What is the difference between a Style 10 and a Style 50 swivel? ▼

Style 10 swivels provide rotation in a single plane (360 degrees around one axis), while Style 50 swivels provide rotation in two perpendicular planes. Style 10 is the most common configuration for simple alignment adjustment, such as connecting a pump truck to a wellhead manifold where the connection needs to rotate in one direction. Style 50 is used when the piping needs to flex in two directions, such as connecting equipment that may shift or vibrate in multiple axes. The style number corresponds to the number of rotation planes: Style 10 (1 plane), Style 50 (2 planes), Style 60 (3 planes), and Style 80 (4 planes).

Are spare parts and packing kits readily available? ▼

Yes. DEENPU maintains a comprehensive inventory of genuine OEM spare parts including packing replacement kits, bearing assemblies, O-ring seals, and complete bearing race sets for all standard swivel joint sizes. Most standard spare parts ship within 24 hours of order receipt. We recommend stocking packing replacement kits on location for high-utilization operations to minimize downtime during maintenance cycles.

What certifications come with the swivel joint? ▼

Standard documentation includes Material Test Reports (MTRs) for all pressure-containing components, hydrostatic test certificates, functional test reports (including rotation test data), and a Certificate of Conformance. Upon request, we provide third-party inspection (API Q1 / ISO 9001), NACE compliance certificates, NDE reports (MPI, UT), and country-specific import certification packages.

Can I combine multiple swivels in a single assembly? ▼

Yes. Multiple DEENPU swivel joints can be combined in series to create custom piping configurations with rotation in multiple planes. For example, combining two Style 10 swivels at 90 degrees creates a two-plane rotation assembly. Combining three swivels can achieve three-plane rotation. These custom assemblies are commonly used in well testing and flowback applications where equipment positioning requires maximum flexibility. DEENPU engineering can design and fabricate complete custom swivel assemblies to your exact piping layout requirements.

Get a Quote for DEENPU Swivel Joints

Contact our sales team today to discuss your swivel joint requirements. We provide rapid quotations, technical support, and global shipping.

EMAIL

SALES@DEENPU-MACHINERY.COM

+86-15806284962