Description
API 8C Rotary Swivel for Oilfield Kelly-Drive Rigs | SL135-SL450 for Land, Offshore & Deep-Well Drilling
SGPE manufactures and supplies API 8C Rotary Swivels for conventional oil and gas drilling rigs using rotary table and Kelly-drive systems. The equipment is also commonly known as an oilfield rotary swivel, drilling swivel, rotary drilling swivel, drilling rig swivel, Kelly swivel, Kelly drive swivel or rotary table swivel.
Installed between the drilling hook and Kelly, the swivel supports the suspended Kelly and drill-string load while allowing the drilling assembly below the hook to rotate. At the same time, the gooseneck, washpipe and hollow swivel stem provide a continuous high-pressure passage for drilling fluid from the rotary hose into the drill string.
SGPE supplies common SL135, SL170, SL225, SL315 and SL450 rotary swivels, covering typical maximum static load ratings from approximately 150 to 500 US tons. Common configurations support drilling-fluid pressures up to approximately 35 MPa / 5,000 psi and rotary speeds up to approximately 300 rpm, depending on the selected model and approved project specification.
Typical applications include oil exploration, natural gas drilling, field development, deep-well drilling, heavy drill-string programs, high-pressure mud circulation, conventional directional drilling, land-rig refurbishment and selected offshore replacement projects.
For maintenance and overhaul, SGPE also supplies rotary swivel washpipes, washpipe packing sets, packing assemblies, main bearings, swivel stems, goosenecks, bails, lower subs, seals and other drilling swivel spare parts.
For a new rig project, provide the rig model, hook capacity, required load, mud pressure, maximum rpm and connection details. For a replacement rotary swivel, the existing manufacturer, model, nameplate, GA drawing and verified dimensions provide the best basis for technical matching.
Product Overview
An API 8C rotary swivel performs two essential functions on a conventional drilling rig. It supports the suspended drill string while also providing a pressure-containing passage for circulating drilling fluid.
The drilling hook carries the swivel through its bail. The swivel stem connects downward to the Kelly, while the gooseneck connects to the rotary drilling hose.
During drilling, the rotary table turns the Kelly and drill string. The main bearing allows the stem and drilling assembly below the swivel to rotate while the upper body remains suspended from the hook.
Meanwhile, drilling fluid moves from the mud pumps through the standpipe and rotary hose. It enters the swivel through the gooseneck, passes through the washpipe and hollow stem, and continues through the Kelly into the drill string.
A heavy-duty drilling swivel therefore has to manage three demanding conditions at the same time:
Heavy Drill-String Load + Continuous Rotation + High-Pressure Mud Circulation
This makes the swivel an important interface between the rig’s hoisting, rotary and drilling-fluid circulation systems.
For replacement work, nominal tonnage alone does not prove interchangeability. Static and dynamic loads, stem bore, bail geometry, gooseneck connection, rotary hose interface, Kelly connection and available installation space also need to match.
For this reason, SGPE approaches a replacement drilling swivel as a rig-interface matching project, rather than simply choosing another unit with the same nominal load rating.
API 8C Rotary Swivel Technical Parameters
General Technical and Operating Data
| Technical Item | Typical SGPE Supply / Project Requirement |
|---|---|
| Product | API 8C Rotary Swivel |
| Equipment Type | Drilling and Hoisting Equipment |
| Common Industry Terms | Drilling Swivel, Oilfield Rotary Swivel, Kelly Swivel, Rotary Table Swivel, Drilling Rig Swivel |
| Main Function | Supports drill-string load and transfers drilling fluid into the rotating drill string |
| Installation Position | Between drilling hook and Kelly |
| Drilling System | Conventional rotary table and Kelly drive |
| Common Models | SL135, SL170, SL225, SL315, SL450 |
| Static Load Range | Approx. 1350-4500 kN |
| Nominal Load Range | Approx. 150-500 US ton |
| Dynamic Load Range | Approx. 1000-3200 kN / 110-350 US ton |
| Maximum Rotary Speed | Up to approx. 300 rpm |
| Maximum Mud Pressure | Up to approx. 35 MPa / 5,000 psi |
| Typical Stem Bore | Approx. 64-75 mm / 2.52-3.00 in |
| Typical Gooseneck Connection | 4 LP |
| Typical Lower Connection | 6-5/8 REG-LH or project-specific |
| Drilling Fluids | WBM, OBM or SBM subject to seal and packing review |
| Common Wear Parts | Washpipe, packing assembly and seals |
| Spinner Option | Kelly spinner configuration subject to project review |
| Main Applications | Land drilling, deep wells, rig refurbishment and replacement |
| Applicable Standard | API Spec 8C; required edition and project scope to be confirmed |
| Product Specification Level | According to purchaser and project requirements |
| NDE | UT, MT, PT or project-required examination |
| Third-Party Inspection | According to purchase specification |
| Documentation | TDS, GA, MTC/MTR, inspection records, NDE reports, test records and agreed MDR |
| Supply Scope | New unit, replacement, rig refurbishment and spare parts |
Technical Note: Final ratings, materials, dimensions, connections, QA scope and documentation are confirmed through the approved technical quotation.
SL135-SL450 Rotary Swivel Performance Specifications
| Model | Max. Static Load | Dynamic Load Rating | Max. Speed | Max. Mud Pressure | Stem Bore |
|---|---|---|---|---|---|
| SL135 | 1350 kN / 150 US ton | 1000 kN / 110 US ton | 300 rpm | 35 MPa / 5,000 psi | 64 mm / 2.52 in |
| SL170 | 1700 kN / 200 US ton | 1300 kN / 140 US ton | 300 rpm | 35 MPa / 5,000 psi | 64 mm / 2.52 in |
| SL225 | 2250 kN / 250 US ton | 1600 kN / 175 US ton | 300 rpm | 35 MPa / 5,000 psi | 75 mm / 3.00 in |
| SL315 | 3150 kN / 350 US ton | 2100 kN / 230 US ton | 300 rpm | 35 MPa / 5,000 psi | 75 mm / 3.00 in |
| SL450 | 4500 kN / 500 US ton | 3200 kN / 350 US ton | 300 rpm | 35 MPa / 5,000 psi | 75 mm / 3.00 in |
The range covers common 150 Ton, 200 Ton, 250 Ton, 350 Ton and 500 Ton drilling swivel requirements, including heavy-duty rigs and mud systems operating at pressures up to approximately 5,000 psi.
Final model selection should follow the complete drilling-rig specification rather than nominal tonnage alone.
Dimensions, Connections and Weight
| Model | Gooseneck Connection | Typical Lower Connection | Reference Overall Size L × W × H | Approx. Weight |
|---|---|---|---|---|
| SL135 | 4 LP | 6-5/8 REG-LH | 1896 × 660 × 780 mm | 1500 kg / 3307 lb |
| SL170 | 4 LP | 6-5/8 REG-LH | 2060 × 820 × 822 mm | 1700 kg / 3748 lb |
| SL225 | 4 LP | 6-5/8 REG-LH | 2296 × 1010 × 957 mm | 2600 kg / 5732 lb |
| SL315 | 4 LP | 6-5/8 REG-LH | 2418 × 1056 × 1041 mm | 3000 kg / 6614 lb |
| SL450 | 4 LP | 6-5/8 REG-LH | 2570 × 1096 × 1012 mm | 3400 kg / 7496 lb |
These values provide a useful reference for model comparison, transportation planning and preliminary replacement review.
Different manufacturers and design generations can still use different bail geometry, stem length, lower connections or overall dimensions. Final replacement compatibility should therefore be checked against the existing rig and approved drawing.
Rotary Swivel with Kelly Spinner
Some conventional drilling rigs use a rotary swivel with Kelly spinner, also called a drilling swivel with spinner or double-duty swivel.
| Base Swivel | Spinner Reference | Reference Assembly Size |
|---|---|---|
| SL135 | XSL135 | Approx. 2326 × 660 × 780 mm |
| SL170 | XSL170 | Approx. 2490 × 820 × 822 mm |
| SL225 | XSL225 | Approx. 2743 × 1010 × 957 mm |
| SL315 | XSL315 | Approx. 2873 × 1026 × 897 mm |
| SL450 | XSL450 | Approx. 3025 × 1096 × 1012 mm |
Depending on the design, the spinner may use pneumatic or hydraulic drive.
Because a spinner changes the overall assembly and installation envelope, the drive system, rig layout and available clearance should be reviewed before the final configuration is confirmed.
SL135-SL450 Drilling Swivel Model Range
SL135 Rotary Swivel – 150 Ton
The SL135 rotary swivel provides a typical maximum static load of approximately 1350 kN / 150 US tons and dynamic load around 1000 kN / 110 US tons.
Common configurations use a 64 mm / 2.52 in stem bore, 4 LP gooseneck connection and 6-5/8 REG-LH lower connection.
The SL135 can suit smaller and medium-capacity land rigs, oil and gas exploration wells, development drilling and replacement of existing 150-ton swivels.
For an SL135 drilling swivel quotation, confirm the hook load, working pressure, bail dimensions and lower connection.
SL170 Rotary Swivel – 200 Ton
The SL170 rotary swivel provides a typical maximum static load of approximately 1700 kN / 200 US tons and dynamic load around 1300 kN / 140 US tons.
It fills the capacity range between the SL135 and SL225 and can suit medium-capacity drilling rigs, natural gas wells, development programs and mature Kelly-drive rig refurbishment.
For an SL170 drilling swivel price or replacement proposal, provide the existing rig model, hook capacity, working pressure, connection details and installation dimensions.
SL225 Rotary Swivel – 250 Ton
The SL225 rotary swivel provides a typical maximum static load of approximately 2250 kN / 250 US tons and dynamic load around 1600 kN / 175 US tons.
Its common 75 mm / 3.00 in stem bore provides a larger drilling-fluid passage than typical SL135 and SL170 configurations.
Typical applications include oil exploration, natural gas drilling, appraisal wells, field development, vertical drilling, compatible directional drilling and mature rig refurbishment.
Customers requesting an SL225 Rotary Swivel Price, 250 Ton Drilling Swivel Quote or Replacement SL225 Swivel can provide existing rig data for interface review.
Washpipes, packing sets, bearings, seals and other SL225 overhaul components can also be supplied separately.
SL315 Rotary Swivel – 350 Ton
The SL315 rotary swivel supports heavier conventional drilling rigs with a typical maximum static load of approximately 3150 kN / 350 US tons and dynamic load around 2100 kN / 230 US tons.
It can suit deep-well and higher-hook-load programs when the complete drilling system matches its operating limits.
For an SL315 350 Ton Rotary Swivel quotation, working pressure, stem bore, bail geometry, gooseneck connection, Kelly connection and installation space should also be reviewed.
SL450 Rotary Swivel – 500 Ton
The SL450 rotary swivel provides a typical maximum static load of approximately 4500 kN / 500 US tons and dynamic load around 3200 kN / 350 US tons.
This heavy-duty 500 Ton Drilling Swivel can serve high-capacity conventional rigs operating with heavy drill strings and demanding drilling-fluid circulation.
Typical applications include deep oil wells, deep gas wells, high-hook-load land rigs, heavy drill-string programs, 5,000 psi mud circulation and selected offshore refurbishment projects.
For an SL450 Rotary Swivel Price, 500 Ton 5000 PSI Drilling Swivel or Replacement SL450 Swivel, the load rating, stem bore, bail geometry, rotary hose interface, lower connection and installation dimensions should all be confirmed before quotation.
How a Drilling Rig Rotary Swivel Works
A conventional Kelly-drive drilling system normally follows this equipment sequence:
Traveling Block → Drilling Hook → Rotary Swivel → Kelly → Kelly Bushing → Rotary Table → Drill String → Drill Bit
The hook suspends the swivel through its bail. The Kelly connects below the swivel stem, while the rotary drilling hose connects to the gooseneck.
When the rotary table turns, the Kelly and drill string rotate below the swivel.
At the same time, drilling fluid follows this path:
Mud Pump → Standpipe → Rotary Hose → Gooseneck → Washpipe → Swivel Stem → Kelly → Drill String → Drill Bit
After leaving the bit nozzles, drilling fluid returns through the annulus and carries cuttings toward the surface.
A drilling rig rotary swivel therefore needs sufficient load capacity, reliable bearing performance and dependable high-pressure sealing throughout drilling operations.
API 8C Rotary Swivel Applications
| Application | Typical Requirement | Main Selection Focus |
|---|---|---|
| Oil Exploration Drilling | Changing well depths and drilling programs | Load, pressure and rpm |
| Natural Gas Drilling | Medium and deep gas wells | Load, bore and mud pressure |
| Appraisal Well Drilling | Reservoir evaluation | Rig model and interfaces |
| Field Development | Repeated drilling operations | Standardization and spare parts |
| Vertical Drilling | Conventional Kelly-drive rig | Static and dynamic load |
| Directional Drilling | Compatible Kelly-drive system | Load, rpm and mud pressure |
| Deep Oil / Gas Wells | Higher drill-string weight | Higher-capacity swivel |
| 5,000 psi Mud Circulation | High-pressure fluid system | Washpipe, packing and pressure rating |
| Heavy Drill-String Program | High suspended load | Static and dynamic rating |
| Onshore Land Rig | Conventional rotary system | Hook and rig compatibility |
| Desert Drilling | Heat and dust exposure | Seals, lubrication and preservation |
| Cold-Region Drilling | Low ambient temperature | Lubricant, seals and material review |
| Fixed Offshore Platform | Existing Kelly-drive system | Interface, QA and documentation |
| Jack-Up Rig Refurbishment | Mature conventional rig | Replacement matching |
| Mobile / Truck-Mounted Rig | Compatible rotary/Kelly arrangement | Weight and installation envelope |
| Rig Fleet Maintenance | Multiple similar rigs | Standardization and spare parts |
| Brownfield Rig Upgrade | Obsolete equipment | Replacement engineering |
Rotary Swivel for Oil Exploration and Field Development
Exploration and field-development programs often involve different well depths, formations and drill-string configurations.
A correctly selected oilfield rotary swivel carries the suspended load while maintaining continuous drilling-fluid circulation.
For multi-well programs, standardizing compatible SL Series swivels can simplify spare-parts stocking, washpipe and packing replacement, maintenance planning and repeat procurement.
Rotary Swivel for Deep Wells and Heavy Drill Strings
Deeper wells increase drill-string weight and place greater demand on the hoisting system.
Higher-capacity configurations such as the SL315 350 Ton Rotary Swivel and SL450 500 Ton Rotary Swivel can support demanding drilling programs when the complete rig matches their ratings.
Well depth alone should not determine the swivel model. Hook load, dynamic load, mud pressure, rpm, bore, connections and installation dimensions should be considered together.
5000 PSI High Pressure Rotary Swivel
Common SL Series configurations can support drilling-fluid pressure up to approximately 35 MPa / 5,000 psi.
Depending on the purchaser’s terminology, the same requirement may appear as a 5000 PSI Rotary Swivel, 5K Drilling Swivel, High Pressure Drilling Swivel, 5000 PSI Oilfield Swivel or 500 Ton 5000 PSI Rotary Swivel.
The pressure-containing path includes the gooseneck, washpipe, packing assembly, swivel stem and related connections.
The working pressure should therefore be reviewed together with the rotary hose rating, stem bore, drilling-fluid type and sealing arrangement.
Rotary Swivel for WBM, OBM and SBM
The load-bearing structure supports the drill string, while the washpipe, packing and seals contact the circulating drilling fluid.
Depending on the well program, the rig may operate with Water-Based Mud (WBM), Oil-Based Mud (OBM) or Synthetic-Based Mud (SBM).
Because mud chemistry and operating temperature can affect seal and packing performance, the actual drilling-fluid system should be identified during technical review.
Land Rig, Offshore and Harsh-Environment Applications
Operating environment can influence more than the nominal swivel rating.
Desert land rigs may require closer review of high ambient temperature, dust exposure, lubrication and preservation. Cold-region drilling can require additional consideration of seals, lubricants and low-temperature material performance.
Offshore refurbishment projects may also require more extensive material traceability, NDE, third-party inspection, preservation and project documentation.
Replacement Rotary Swivel for Existing and Legacy Drilling Rigs
Replacement is a common requirement for mature drilling rigs, especially when the original swivel is obsolete, damaged or no longer supported.
The rig owner may have an old GA drawing, a nameplate, a maintenance record or only the existing physical swivel available for comparison.
SGPE can review Replacement Rotary Swivels, Replacement Kelly Swivels, Legacy Drilling Swivels, OEM Replacement Swivels and Replacement SL Series Swivels using available field information.
| Replacement Data | Why It Matters | Priority |
|---|---|---|
| Existing Swivel Model | Identifies original design family | Very High |
| Original Manufacturer | Helps compare design differences | High |
| Rig Manufacturer / Model | Confirms rig configuration | Very High |
| Hook Capacity | Confirms hoisting requirement | Very High |
| Static Load | Defines primary load rating | Very High |
| Dynamic Load | Defines operating load | Very High |
| Mud Pressure | Defines pressure requirement | Very High |
| Maximum RPM | Defines rotary duty | High |
| Stem Bore | Confirms flow passage | High |
| Gooseneck Connection | Confirms rotary hose interface | Very High |
| Kelly Connection | Confirms lower interface | Very High |
| Bail Dimensions | Confirms hook fit | Very High |
| Overall Dimensions | Confirms installation envelope | Very High |
| Nameplate | Confirms model and ratings | Very High |
| GA Drawing | Provides dimensional reference | Very High |
During replacement review, three interfaces deserve particular attention:
Drilling Hook → Rotary Swivel
Rotary Hose → Gooseneck
Rotary Swivel → Kelly
Checking these interfaces before manufacturing helps reduce unexpected field modification, installation delays and avoidable rig downtime.
Why Same-Tonnage Rotary Swivels May Not Be Interchangeable
Two 250-ton, 350-ton or 500-ton swivels can share the same nominal rating and still have different physical interfaces.
Differences may include bail geometry, overall height, stem length, gooseneck thread, Kelly connection, washpipe arrangement, packing design or spinner interface.
A Replacement SL225, SL315 or SL450 Rotary Swivel should therefore not be selected from tonnage alone.
Where possible, provide the original GA drawing and nameplate. If these are unavailable, clear equipment photographs and verified field measurements provide a practical starting point for replacement engineering.
Rotary Swivel Components and Spare Parts
Main Components
| Component | Main Function | Maintenance Focus |
|---|---|---|
| Swivel Bail | Transfers load from drilling hook | Wear, deformation and load-bearing surfaces |
| Swivel Body | Supports internal components | Structural and dimensional condition |
| Gooseneck | Connects rotary hose to mud passage | Threads, erosion and pressure integrity |
| Washpipe | Transfers mud across rotating interface | Wear and sealing surface |
| Packing Assembly | Seals drilling fluid around washpipe | Leakage and packing wear |
| Swivel Stem | Carries drilling load and mud flow | Threads, bore and sealing surfaces |
| Main Bearing | Supports axial drill-string load | Lubrication, temperature and wear |
| Lower Sub | Connects swivel to Kelly | Thread condition |
| Oil Seals / O-Rings | Support lubricant retention and sealing | Aging and damage |
Rotary Swivel Washpipe and Packing
The rotary swivel washpipe and packing assembly operates between the relatively stationary upper mud passage and the rotating stem.
This area experiences drilling-fluid pressure, continuous rotation, abrasive solids and sealing friction. As a result, the washpipe and packing are among the most frequently serviced parts of a drilling swivel.
Common procurement descriptions include Drilling Swivel Washpipe, Rotary Swivel Washpipe Packing, Washpipe Packing Set, Rotary Swivel Packing Assembly, Swivel Seal Kit and Washpipe Repair Kit.
A worn packing set can cause mud leakage, while a damaged washpipe sealing surface can accelerate packing wear.
The correct replacement parts can be identified from the swivel model, part number, drawing or existing component dimensions.
Common Rotary Swivel Spare Parts
| Spare Part | Main Function | Typical Requirement |
|---|---|---|
| Washpipe | Transfers drilling fluid | Wear / overhaul |
| Washpipe Packing Set | Pressure sealing | Leakage / maintenance |
| Packing Assembly | High-pressure sealing | Repair |
| Packing Box | Supports packing components | Overhaul |
| Main Bearing | Carries axial load | Major overhaul |
| Bearing Components | Maintain alignment | Repair |
| Swivel Stem | Carries load and fluid | Damage / overhaul |
| Gooseneck | Rotary hose interface | Wear / replacement |
| Swivel Bail | Hook interface | Structural replacement |
| Lower Sub | Kelly connection | Thread wear |
| Oil Seals | Lubricant retention | Leakage |
| O-Rings / Gaskets | Secondary sealing | Routine service |
SGPE can supply individual components or complete rotary swivel spare-parts packages for overhaul, preventive maintenance and rig-fleet stocking.
For an urgent Drilling Swivel Spare Parts quotation, provide the swivel model, part number, drawing and clear photographs.
Rotary Swivel vs Power Swivel vs Top Drive
| Feature | Rotary Swivel | Power Swivel | Top Drive |
|---|---|---|---|
| Supports Suspended Load | Yes | Yes | Yes |
| Provides Mud Passage | Yes | Yes | Yes |
| Provides Powered Rotation | No | Yes | Yes |
| Rotation Source | Rotary Table + Kelly | Hydraulic / Electric Drive | Integrated Drive |
| Kelly Normally Used | Yes | Often No | No |
| Typical Application | Conventional Drilling Rig | Drilling / Workover | Modern Drilling Rig |
A conventional rotary swivel carries drilling load and provides the drilling-fluid passage, but it normally does not generate drilling torque. The rotary table turns the Kelly and drill string.
A power swivel includes its own hydraulic or electric drive, while a top drive provides powered rotation and drilling-fluid circulation as part of a traveling drilling system.
This distinction matters when comparing a Rotary Swivel vs Power Swivel, Kelly Swivel vs Power Swivel or Drilling Swivel vs Top Drive.
API Spec 8C, PSL and Project Requirements
API Spec 8C covers drilling and production hoisting equipment, including rotary swivels.
For a project RFQ, the purchaser should identify the applicable API 8C edition, Product Specification Level and any supplementary technical or quality requirements.
The project specification may also define material traceability, NDE, pressure testing, inspection hold points, witness points, third-party inspection, product marking and documentation.
Where API Monogram marking is specifically required, this requirement should be stated clearly in the RFQ and purchase order.
SGPE confirms the applicable manufacturing, compliance, marking and documentation scope before order placement rather than applying the same certification statement to every configuration.
SGPE Manufacturing, Inspection and Documentation
SGPE supports drilling contractors, rig builders, EPC companies, oilfield service companies and project buyers that require both the equipment and a controlled technical documentation package.
| QA / Inspection Item | Typical Project Control |
|---|---|
| Raw Material | MTC/MTR and heat traceability |
| Heat Treatment | Manufacturing records |
| Mechanical Properties | According to approved specification |
| Bail | Dimensional and load-bearing inspection |
| Swivel Stem | Bore, dimensions and connection inspection |
| Threads | Critical connection inspection |
| Bearing Assembly | Assembly and lubrication inspection |
| Washpipe / Packing | Assembly and sealing checks |
| NDE | UT / MT / PT according to project scope |
| Mud Passage | Pressure testing where required |
| Final Dimensions | Verification against approved GA |
| Product Identification | Marking and traceability |
| Final Inspection | Product and document review |
| Export Packing | Preservation and shipment protection |
Depending on the purchase order, documentation can include a Technical Data Sheet, GA Drawing, approved product drawing, Material Test Certificates, dimensional inspection report, thread inspection record, NDE reports, pressure-test records, final inspection report, Certificate of Conformity, Packing List, O&M Manual, recommended spare-parts list, ITP, MDR and third-party inspection records.
Customers with formal vendor-document requirements can submit the document register with the RFQ for review before order confirmation.
API 8C Rotary Swivel Selection Guide
| Selection Item | Information to Confirm |
|---|---|
| Drilling System | Rotary Table / Kelly Drive |
| Rig Manufacturer | Manufacturer Name |
| Rig Model | Exact Model |
| Hook Capacity | kN / US ton |
| Required Static Load | kN / US ton |
| Required Dynamic Load | kN / US ton |
| Maximum Mud Pressure | psi / MPa |
| Maximum Rotary Speed | rpm |
| Stem Bore | mm / in |
| Mud System | WBM / OBM / SBM |
| Gooseneck Connection | Size and Thread |
| Rotary Hose Connection | Size and Pressure Rating |
| Kelly Connection | Thread and Size |
| Bail Dimensions | Hook Interface |
| Overall Dimensions | Installation Envelope |
| Ambient Temperature | Minimum / Maximum |
| Existing Swivel | Manufacturer and Model |
| API / PSL | Project Requirement |
| NDE | Required Scope |
| TPI | Required / Not Required |
| Documentation | TDS / MTC / ITP / MDR |
| Spare Parts | Required Maintenance Package |
Quick Model Reference
| Typical Maximum Static Load | Common Model |
|---|---|
| 150 US ton / 1350 kN | SL135 |
| 200 US ton / 1700 kN | SL170 |
| 250 US ton / 2250 kN | SL225 |
| 350 US ton / 3150 kN | SL315 |
| 500 US ton / 4500 kN | SL450 |
This table is intended for initial model screening only. Final selection should use the complete drilling-rig specification.
API 8C Rotary Swivel Price and Quotation
Buyers sourcing an API 8C Rotary Swivel Manufacturer, Oilfield Rotary Swivel Supplier, Drilling Swivel Supplier, Rotary Swivel Price, 500 Ton Drilling Swivel Price or Replacement Drilling Swivel Quote usually need more than a model number to receive an accurate proposal.
The quotation depends on the selected model, static and dynamic loads, mud pressure, maximum rpm, stem bore, gooseneck connection, Kelly connection and bail dimensions.
The final supply scope may also depend on the Kelly spinner, project materials, drilling-fluid compatibility, API/PSL requirements, NDE, TPI, documentation and spare-parts package.
Commercial factors such as quantity, required delivery schedule, destination and Incoterm also influence the final quotation.
For example, an SL450 500 Ton Rotary Swivel differs substantially from an SL135 in size, weight and load-bearing configuration. A cross-manufacturer replacement project may also require additional dimensional and interface review before the final price can be confirmed.
For faster quotation, provide the rig specification, existing swivel data, quantity, destination and required delivery date with the inquiry.
Why Choose SGPE for Rotary Swivel Supply?
SGPE focuses on equipment for oilfield drilling, well control, wellhead and upstream operations.
For drilling swivel projects, technical review centers on the complete rig interface rather than catalog tonnage alone.
The supply range can cover SL135-SL450 rotary swivels, 150-500 Ton oilfield drilling swivels, 5,000 psi configurations, replacement Kelly swivels, legacy rig replacement, swivel-with-spinner configurations and drilling swivel spare parts.
For new equipment, SGPE reviews the rig model, hook load, working pressure, rpm and connection arrangement.
For replacement projects, the technical team can work from the existing model, nameplate, GA drawing and verified field dimensions.
For maintenance programs, SGPE can supply washpipes, packing assemblies, bearings, stems, goosenecks, lower subs, seals and complete spare-parts packages according to the required scope.
Project documentation can also be reviewed against drilling-contractor, EPC or end-user requirements.
This approach helps reduce interface risk, unnecessary field modification and delays during rig commissioning, overhaul or refurbishment.
Information Required for a Rotary Swivel RFQ
| RFQ Item | Recommended Information |
|---|---|
| Product | API 8C Rotary Swivel |
| Required Model | SL135 / SL170 / SL225 / SL315 / SL450 / Other |
| Quantity | Main Units and Spare Quantity |
| Rig Manufacturer | Manufacturer |
| Rig Model | Exact Model |
| Rig Type | Land / Offshore / Mobile / Other |
| Drilling System | Kelly Drive / Rotary Table |
| Well Application | Exploration / Development / Deep Well etc. |
| Hook Load | kN / US ton |
| Static Load | Required Value |
| Dynamic Load | Required Value |
| Mud Pressure | psi / MPa |
| Maximum RPM | Required Value |
| Stem Bore | mm / in |
| Mud System | WBM / OBM / SBM |
| Gooseneck Connection | Size / Thread |
| Rotary Hose Connection | Size / Pressure Rating |
| Kelly Connection | Thread / Size |
| Bail Dimensions | Hook Interface |
| Existing Swivel | Manufacturer and Model |
| Nameplate | Clear Photograph |
| GA Drawing | Original or Field Drawing |
| Kelly Spinner | Required / Not Required |
| Ambient Temperature | Minimum / Maximum |
| API / PSL | Required Scope |
| NDE | Required Methods |
| TPI | Required / Not Required |
| Documentation | TDS / MTC / COC / ITP / MDR etc. |
| Spare Parts | Required Maintenance Items |
| Delivery | Required Delivery Schedule |
| Destination | Country / Port / Project Site |
| Incoterm | EXW / FOB / CIF / CIP / DAP |
If complete technical data is unavailable, send the existing swivel nameplate, rig model and several clear photographs first. SGPE can then identify the additional information required for technical matching.
Frequently Asked Questions About API 8C Rotary Swivels
1. What is an API 8C Rotary Swivel and how does it work on a drilling rig?
An API 8C Rotary Swivel serves as both a load-bearing component and a drilling-fluid passage on conventional oil and gas drilling rigs with rotary table and Kelly-drive systems. The drilling hook supports the swivel through its bail, while the Kelly connects below the swivel stem.
During drilling, the rotary table turns the Kelly and drill string below the swivel. At the same time, drilling fluid flows from the rotary hose through the gooseneck, washpipe and hollow stem into the drill string. This arrangement allows the swivel to carry substantial suspended load while maintaining continuous mud circulation.
The industry also commonly refers to this equipment as an Oilfield Rotary Swivel, Drilling Swivel, Kelly Swivel, Kelly Drive Swivel or Drilling Rig Swivel.
2. Which SL Series API 8C Rotary Swivel models does SGPE supply?
SGPE supplies common SL135, SL170, SL225, SL315 and SL450 Rotary Swivels, covering typical maximum static load classes from approximately 150 to 500 US tons.
The SL135 and SL170 suit smaller and medium-capacity conventional drilling rigs, while the SL225 provides a common 250-ton option for exploration and field-development drilling. Higher-capacity SL315 and SL450 models can support deeper wells, heavier drill strings and higher hook loads when the overall rig configuration matches their operating limits.
SGPE can support new drilling-rig projects, replacement swivels, rig refurbishment and spare-parts requirements across these model ranges.
3. Can an API 8C Rotary Swivel operate at 5,000 psi and 300 rpm?
Common SL Series configurations can handle drilling-fluid pressures up to approximately 35 MPa / 5,000 psi and rotary speeds up to approximately 300 rpm, depending on the selected model and approved project specification.
However, pressure and rpm alone do not determine suitability. The technical review should also consider hook load, static and dynamic load ratings, stem bore, rotary hose rating, gooseneck connection, washpipe condition, packing system and drilling-fluid properties.
For high-pressure mud circulation, deep-well drilling and heavy-duty land-rig applications, SGPE reviews the complete operating conditions before confirming the swivel configuration.
4. How do I choose between SL135, SL170, SL225, SL315 and SL450 Rotary Swivels?
Start with the required static and dynamic loads, then review mud pressure, maximum rpm, stem bore, bail geometry, gooseneck connection, Kelly connection, rotary hose interface and available installation space.
For example, an SL450 500 Ton Rotary Swivel provides a higher load capacity than an SL225, but it also has different dimensions, weight and interface requirements. A larger swivel does not automatically provide better compatibility.
For new rigs, the rig model and hook capacity provide a useful starting point. For replacement projects, the existing swivel nameplate, GA drawing and verified field dimensions help SGPE match the new unit more accurately.
5. What is the difference between 150 Ton, 250 Ton, 350 Ton and 500 Ton Drilling Swivels?
The main difference lies in load capacity. Typical examples include the SL135 in the 150-ton class, SL225 at 250 ton, SL315 at 350 ton and SL450 at 500 ton.
These models can also differ in dynamic load rating, stem bore, overall dimensions, weight and connection geometry. A 500 Ton Drilling Swivel can suit deep wells and heavy drill-string programs, while lower-capacity models often fit smaller conventional land rigs and medium-depth drilling operations.
The final selection should balance load capacity with actual rig interfaces and operating conditions.
6. What stem bore and connections are commonly used on SL Series Rotary Swivels?
Common SL135 and SL170 configurations use an approximately 64 mm / 2.52 in stem bore, while SL225, SL315 and SL450 models commonly use approximately 75 mm / 3.00 in.
Typical configurations may use a 4 LP gooseneck connection and a 6-5/8 REG-LH lower connection. However, manufacturers and design generations can use different connection details, stem lengths and interface dimensions.
SGPE therefore recommends checking the approved GA drawing, gooseneck connection, Kelly connection and stem dimensions before manufacturing a new swivel or replacing an existing unit.
7. Can API 8C Rotary Swivels handle WBM, OBM and SBM drilling fluids?
Yes. SGPE can review rotary swivel configurations for Water-Based Mud (WBM), Oil-Based Mud (OBM) and Synthetic-Based Mud (SBM) service.
The swivel body and load-bearing structure carry the mechanical load, while the washpipe, packing assembly and seals remain in direct contact with the circulating drilling fluid. Mud chemistry, solids content, temperature and operating pressure can affect packing performance and seal life.
For OBM, SBM or high-temperature drilling, customers should provide the drilling-fluid information during the RFQ stage so SGPE can review the sealing and packing arrangement for the intended service.
8. Can SGPE supply a Replacement Rotary Swivel for an obsolete or discontinued rig?
Yes. SGPE supports Replacement Rotary Swivels, Replacement Kelly Swivels, Legacy Drilling Swivels and Replacement SL Series Swivels for mature rigs where the original equipment has become obsolete, damaged or difficult to source.
For technical matching, SGPE reviews the original manufacturer, swivel model, rig model, hook capacity, mud pressure, maximum rpm, stem bore, bail dimensions, gooseneck connection, Kelly connection, nameplate and GA drawing.
Two 250-ton, 350-ton or 500-ton swivels may share the same nominal rating but still use different physical interfaces. For this reason, SGPE matches replacement equipment against actual rig dimensions and connection data instead of relying on tonnage alone.
9. What Rotary Swivel spare parts can SGPE supply for maintenance and overhaul?
SGPE supplies common Rotary Swivel Spare Parts for preventive maintenance, routine repair and major overhaul. Typical parts include washpipes, washpipe packing sets, packing assemblies, packing boxes, main bearings, bearing components, swivel stems, goosenecks, bails, lower subs, oil seals, O-rings and gaskets.
The Rotary Swivel Washpipe and Packing Assembly require particular attention because they work under drilling-fluid pressure and continuous rotation. Worn packing can cause mud leakage, while damage to the washpipe sealing surface can accelerate packing wear and reduce sealing performance.
For accurate parts identification, customers can send the swivel model, part number, existing drawing, component dimensions or clear photographs. SGPE can then recommend individual replacement parts or a complete drilling swivel spare-parts package.
10. What is the difference between a Rotary Swivel, Power Swivel and Top Drive?
A conventional Rotary Swivel carries the drill-string load and provides a drilling-fluid passage, but it normally does not generate drilling torque. The rotary table drives the Kelly and drill string below the swivel.
A Power Swivel uses its own hydraulic or electric drive to generate rotation, while a Top Drive combines powered rotation and drilling-fluid circulation in a traveling drilling system.
This distinction matters when selecting equipment for land drilling, workover or rig modernization. An API 8C Rotary Swivel best suits conventional rigs that still operate with a rotary table and Kelly-drive system.
11. Can an API 8C Rotary Swivel work on offshore, deep-well and harsh-environment drilling projects?
Yes, provided the rig uses a compatible rotary-table and Kelly-drive arrangement.
SGPE can review API 8C Rotary Swivels for deep oil wells, natural gas wells, heavy drill-string programs, fixed offshore platforms, jack-up rig refurbishment, desert drilling and cold-region drilling.
Deep-well programs may require higher-capacity models such as the SL315 or SL450. Offshore and harsh-environment projects may also require additional attention to NDE, material traceability, preservation, seal selection, lubrication, third-party inspection and project documentation.
SGPE reviews both the operating environment and the rig interface before confirming the final configuration.
12. How can I get an API 8C Rotary Swivel price or quotation from SGPE?
For an accurate API 8C Rotary Swivel price or quotation, provide the required model, drilling-rig manufacturer and model, hook capacity, static and dynamic load requirements, mud pressure, maximum rpm, stem bore, gooseneck connection, Kelly connection and quantity.
For a Replacement Rotary Swivel, also provide the existing manufacturer, swivel model, nameplate, GA drawing and verified interface dimensions whenever available.
If your project requires API/PSL documentation, NDE, TPI, ITP, MDR, spare parts or special inspection, include those requirements in the same RFQ. SGPE will review the drilling-rig data and project scope and then provide a suitable technical proposal and corresponding commercial quotation.
