Description
API 6A Ring Type Joint Gaskets for Wellhead, BOP and Choke Manifold
SGPE supplies API 6A Ring Type Joint Gaskets for high-pressure flange connections used in drilling, well control, wellhead, completion, stimulation, testing and production systems.
The product range includes Type R, Type RX and Type BX RTJ gaskets for compatible API 6B, API 6BX and approved oilfield ring-joint grooves. Available materials include soft iron, low carbon steel, stainless steel, duplex stainless steel, super duplex stainless steel, Inconel 625 and other approved corrosion-resistant alloys.
Customers can order one emergency replacement ring, a standard production batch, an OEM replacement RTJ gasket or a complete gasket kit for a BOP stack, wellhead assembly, Christmas tree, drilling spool or choke manifold.
For replacement and custom projects, SGPE can review flange markings, equipment data, OEM part numbers, drawings, groove details and existing gasket photographs before confirming the required profile, ring number, material and inspection scope.
Key Product Specifications
| Item | Available Options |
|---|---|
| Product | API 6A Ring Type Joint Gasket |
| Alternative Names | API 6A RTJ gasket, ring joint gasket, API ring gasket, metal ring seal |
| Profiles | Type R, Type RX and Type BX |
| Type R Sections | Oval and octagonal |
| Flange Compatibility | Approved API 6B, API 6BX and oilfield RTJ grooves |
| Standard Materials | Soft iron and low carbon steel |
| Corrosion-Resistant Materials | Stainless steel, duplex, super duplex, Inconel 625 and approved CRAs |
| Service Conditions | Standard, offshore, high-pressure, high-temperature, sour and corrosive service |
| Manufacturing | Precision machining from solid metallic material |
| Identification | Ring profile, ring number, material and traceability marking |
| Inspection | Visual, dimensional, hardness, material, coating and marking checks |
| Supply Scope | Individual rings, replacement gaskets, custom products and complete gasket kits |
| Packing | Individual protection, clear labeling and export packing |
What Is an API 6A Ring Type Joint Gasket?
An API 6A Ring Type Joint Gasket is a precision-machined metallic seal designed for compatible oilfield RTJ flange connections. It is also commonly referred to as an API 6A RTJ gasket, ring joint gasket, API ring gasket, metal ring gasket or oilfield flange seal.
The gasket sits inside matching grooves on two flange faces. When technicians tighten the flange bolting, the grooves compress the ring and create a narrow sealing band with high contact stress. Unlike rubber or fiber gaskets, an RTJ gasket does not rely on a flexible filler. Instead, the metal ring seals through direct contact with the flange grooves.
This metal-to-metal sealing design makes the gasket suitable for demanding oilfield service. Typical applications include wellhead and Christmas tree pressure containment, BOP stack assembly and pressure testing, offshore drilling and production, choke and kill manifold connections, hydraulic fracturing systems, surface well testing, completion and workover operations, sour oil and gas production, and water, gas or chemical injection systems.
The gasket does not determine the working pressure by itself. The complete flange assembly controls the allowable pressure rating. Therefore, the ring profile, ring number, flange type, pressure class, groove geometry, material and service condition must all match the approved connection design.
How an RTJ Metal Ring Seal Works
During flange makeup, the groove surfaces apply compressive force to the ring. The gasket deforms in a controlled manner and conforms to the approved sealing surfaces.
| Sealing Factor | Effect on the Connection |
| Concentrated Contact Stress | Creates a narrow, high-load sealing band |
| Controlled Ring Deformation | Helps the gasket conform to the groove |
| Metallic Construction | Supports high-pressure and high-temperature service |
| Pressure-Energized Geometry | Allows RX and BX profiles to use internal pressure to reinforce sealing |
| Correct Hardness Relationship | Helps the gasket deform before the flange groove |
| Even Bolt Loading | Promotes uniform flange closure |
| Clean Groove Surfaces | Reduces leakage caused by dirt, scale and corrosion |
A new ring cannot compensate for a damaged groove, severe flange misalignment or an incorrect tightening procedure. The complete connection should always be inspected before assembly.
Type R, RX and BX Ring Joint Gaskets
Type R Ring Gasket
The Type R Ring Gasket uses either an oval or octagonal cross-section and commonly fits approved API 6B and other compatible oilfield RTJ grooves.
An oval ring has a rounded cross-section and remains widely used on traditional wellhead and valve connections. By comparison, an octagonal ring uses flat sealing faces and usually creates a broader contact area against the flange groove.
Both profiles can provide reliable sealing when they match the approved groove geometry. However, the flange drawing and equipment specification must determine the final selection. Buyers should not switch between oval and octagonal rings based only on nominal flange size.
Type RX Ring Gasket
The Type RX Ring Gasket uses an asymmetrical pressure-energized profile. Internal pressure acts on the ring geometry and increases sealing contact against the groove.
RX rings commonly serve approved API 6B wellheads, Christmas trees, production valves and injection equipment.
An RX gasket does not share the same cross-section as a standard Type R ring. Therefore, buyers should not assume that the two profiles are interchangeable, even when their ring numbers appear related.
The supply range includes API RX gaskets, API 6A RX rings, wellhead RX gaskets and Christmas tree sealing rings.
Type BX Ring Gasket
The Type BX Ring Gasket uses a pressure-energized profile designed for API 6BX flange grooves.
High-pressure wellheads, BOP stacks, drilling spools, adapter spools, test stumps, choke manifolds and kill manifolds commonly use BX rings.
A BX gasket must match its corresponding API 6BX groove. Type R and Type RX gaskets cannot replace it.
Available BX products include BOP sealing rings, high-pressure wellhead gaskets, drilling spool gaskets and choke manifold gaskets for compatible 10,000 psi, 15,000 psi and 20,000 psi flange systems.
R, RX and BX Gasket Comparison
| Gasket Type | Flange Compatibility | Cross-Section | Pressure-Energized | Typical Application | Selection Rule |
| Type R | API 6B and approved compatible grooves | Oval or octagonal | No | Wellheads, trees, valves and selected pressure-control equipment | Match the approved groove profile |
| Type RX | Approved compatible API 6B grooves | Asymmetrical profile | Yes | Wellheads, production trees, injection trees and valves | Confirm the drawing before replacing Type R |
| Type BX | API 6BX grooves | High-pressure profile | Yes | BOP stacks, high-pressure wellheads, drilling spools and manifolds | Use the specified BX ring number |
This table provides general guidance. The flange designation, approved drawing and exact ring number must determine the final selection.
API 6A, API 16A and API 16C Applications
API 6A mainly applies to wellheads, Christmas trees, valves and other related pressure-containing equipment used in oil and gas production systems.
API 16A covers blowout preventers, drilling spools and other drill-through pressure-control equipment. API 16C applies to choke and kill systems, including choke manifolds, kill manifolds, chokes and associated valves.
Although these standards cover different equipment categories, products manufactured to API 16A or API 16C may still use recognized Type R, Type RX or Type BX ring gaskets when compatible RTJ flange connections form part of the design.
For example, an API 16A BOP stack may require a Type BX flange gasket, while an API 16C choke manifold may use an R, RX or BX ring according to the actual flange type, groove geometry and equipment drawing.
Before confirming the correct gasket, SGPE reviews the applicable equipment standard, flange designation, ring number, approved connection drawing, working pressure, operating temperature, material requirement, sour-service condition and process medium. This review helps ensure that the selected ring profile, material and dimensions match the complete flange connection.
API 6B and API 6BX Flange Gaskets
API 6B flange connections commonly use Type R or approved Type RX ring gaskets. These connections often appear on casing heads, casing spools, tubing heads, Christmas trees, master valves and wing valves.
API 6BX flange connections require Type BX gaskets. Typical applications include BOP stacks, high-pressure wellheads, drilling spools, test stumps, choke manifolds, kill manifolds and frac trees.
Nominal bore alone cannot identify the correct ring. Two flanges with the same bore may require different gaskets because the pressure class, groove profile or connection design differs.
For an API 6B connection, confirm whether the groove requires an R or RX ring and verify the exact ring number.
For an API 6BX connection, confirm the complete BX designation.
Legacy or proprietary equipment may use an OEM-specific groove. In this case, SGPE requires the approved groove drawing, original part number or a suitable sample before production.
RTJ Gasket Materials
The correct material depends on the flange grade, groove hardness, operating temperature, process fluid, corrosion level and project specification.
| Material | General Corrosion Resistance | Typical Oilfield Use | Selection Note |
| Soft Iron | Basic | Standard flange connections where approved | Confirm material designation, hardness and coating |
| Low Carbon Steel | Basic to moderate | General wellhead, BOP, spool, valve and manifold service | Review offshore, H₂S and chloride exposure |
| Stainless Steel 304 | Moderate | Atmospheric and selected process corrosion | Confirm fluid compatibility |
| Stainless Steel 316 | Moderate to high | Offshore and selected corrosive production service | Review chloride level and material class |
| Stainless Steel 347 | Moderate to high | Selected elevated-temperature service | Confirm maximum operating temperature |
| Duplex Stainless Steel | High | Produced-water and offshore applications | Check hardness and flange compatibility |
| Super Duplex Stainless Steel | Very high | Seawater injection and severe chloride exposure | Complete an engineering review |
| Inconel 625 | Very high | Sour gas, high-temperature and aggressive service | Confirm flange hardness and galling risk |
| Other CRAs | Project-specific | Special wellhead and pressure-control service | Follow the approved material specification |
The gasket should normally remain softer than the mating flange groove. This hardness relationship allows the ring to deform correctly during flange makeup while helping protect the more expensive flange sealing surface.
An excessively hard ring may not seat properly and can damage the groove. For this reason, material selection should take into account the gasket grade and heat treatment, maximum allowable hardness, mating flange material, groove hardness, minimum and maximum operating temperature, H₂S and CO₂ exposure, chloride concentration, process-fluid chemistry and potential galling risk.
All of these factors should be reviewed together before confirming the final gasket material. This helps ensure reliable sealing performance, suitable flange compatibility and longer service life under the intended operating conditions.
Material Selection by Service Condition
Soft iron and low carbon steel suit many standard land-rig and general oilfield connections when the equipment specification permits them.
Offshore equipment may require stronger protection against atmospheric corrosion. Depending on the environment, customers may select a suitable surface finish, stainless steel or another corrosion-resistant alloy.
Produced water, brine and seawater injection create different corrosion risks. Chloride content, temperature and fluid chemistry should be reviewed before selecting stainless steel, duplex or super duplex.
Inconel 625 may suit selected sour gas, high-temperature and aggressive production environments. However, a higher-alloy material is not automatically the best choice. Flange compatibility, hardness and galling risk remain important.
For emergency replacement, the safest approach is normally to match the original approved material. Changing the alloy without engineering review may introduce sealing, corrosion or installation problems.
Sour-Service and NACE RTJ Gaskets
For a sour-service inquiry, customers should provide the applicable NACE MR0175, ISO 15156 or client material specification together with the H₂S service condition or partial pressure, CO₂ concentration, minimum and maximum operating temperature, chloride content or produced-water data, mating flange material and maximum allowable gasket hardness. Any PMI, material traceability or additional inspection requirements should also be stated at the inquiry stage.
According to the purchase order, SGPE can include Positive Material Identification, hardness testing, full material traceability and EN 10204 3.1 certification in the documentation package. This information helps the engineering team confirm that the selected gasket material, hardness and inspection scope are suitable for the intended sour-service connection.
Optional Surface Coatings
Available finishes may include zinc plating, silver plating, PTFE-based coating and project-specific anti-corrosion treatments.
Zinc plating can support storage and atmospheric corrosion protection. Silver plating may help reduce galling during assembly. PTFE-based finishes can provide temporary surface protection and installation support.
A coating cannot correct an unsuitable base material, incorrect hardness or an incompatible groove. The selected finish must suit the operating temperature, process medium and approved installation procedure.
Common API Ring Gasket Numbers
Oilfield buyers normally identify an RTJ gasket by its profile and ring number.
| Profile | Common Ring Numbers | Typical Description |
| Type R | R23, R24, R26, R27, R31, R35, R37, R39, R45, R46, R49, R54 | Oval or octagonal Type R ring gasket |
| Type RX | RX24, RX27, RX31, RX35, RX39, RX44, RX45 | Pressure-energized API 6B wellhead gasket |
| Type BX | BX152, BX153, BX154, BX155, BX156, BX158, BX160, BX162, BX164 | API 6BX BOP or high-pressure flange gasket |
Common replacement inquiries include R23 ring gaskets, R27 octagonal rings, RX24 RTJ gaskets, RX35 wellhead gaskets, BX154 BOP gaskets, BX160 high-pressure rings and BX164 BOP sealing rings.
The ring number describes the gasket geometry. It does not simply indicate the flange bore. Exact dimensions should be confirmed from the applicable standard, approved drawing and equipment information.
How to Identify a Replacement Ring Gasket
The existing ring marking usually provides the quickest way to identify a replacement gasket. A clear flange marking, OEM parts list or approved equipment drawing can provide an even more reliable reference.
When the ring number is unknown, customers should provide the flange size and pressure class, flange type or designation, equipment manufacturer and model, equipment serial number and OEM part number. General arrangement drawings and groove detail drawings are also helpful for confirming the correct profile and dimensions.
If drawings are unavailable, the existing gasket can be measured. Useful dimensions include the inside diameter, outside diameter, overall height and cross-section. Clear photographs of the gasket, flange groove and equipment nameplate should also be provided whenever possible.
A used ring can support the identification process, but installation may have altered its original dimensions or sealing surfaces. Therefore, SGPE gives greater weight to approved drawings, flange markings and original parts lists when confirming a replacement RTJ gasket.
Oilfield Applications
Wellhead and Christmas Tree Equipment
Ring joint gaskets seal compatible RTJ flange connections throughout wellhead and Christmas tree assemblies. Typical applications include casing heads, casing spools, tubing heads, tubing spools, wellhead adapters, test flanges, production trees and injection trees.
They are also used on master valves, wing valves, swab valves, tree caps, flow crosses, production chokes and surface safety valves where an approved ring-joint flange connection is specified.
Accordingly, the supply range covers wellhead gaskets, casing spool gaskets, tubing head sealing rings, Christmas tree gaskets and API 6A valve ring gaskets for new equipment, maintenance and replacement projects.
BOP and Drilling Equipment
Where compatible RTJ flanges are installed, ring gaskets are commonly used on annular BOPs, single and double ram BOPs, drilling spools, adapter spools, double studded adapters, BOP test stumps and high-pressure wellhead adapters.
High-pressure BOP equipment often uses API 6BX Type BX ring gaskets. However, the approved BOP stack drawing, flange designation and exact connection details must determine the required ring number. Buyers should not select a BX gasket based only on the nominal bore or pressure class.
Choke and Kill Systems
Ring joint gaskets also seal compatible connections on choke manifolds, kill manifolds, manual chokes, hydraulic chokes, gate valves, check valves, mud crosses, high-pressure tees and pressure-control skids.
The supply range therefore includes choke manifold gaskets, kill manifold gaskets, API 16C ring gaskets and high-pressure metal flange seals for new equipment, maintenance, overhaul and replacement projects.
Completion, Fracturing and Well Testing
Compatible RTJ flange connections may also appear on completion wellheads, workover BOP stacks, frac trees, frac manifolds, surface test trees, flowhead assemblies, well test manifolds and injection systems.
However, not all oilfield equipment uses ring-joint flanges. Some systems use hammer unions, clamp hubs or proprietary connectors instead. For this reason, customers should confirm the actual connection type, flange marking and equipment drawing before ordering a ring gasket.
Why Correct Gasket Selection Matters
The wrong ring number may prevent full contact between the gasket and flange groove. Likewise, an incorrect Type R, Type RX or Type BX profile can cause leakage, incomplete flange closure or permanent damage to the sealing groove.
Gasket hardness and material compatibility are equally important. An excessively hard ring may not deform correctly during flange makeup, while an unsuitable material may corrode, crack or lose sealing integrity under the intended pressure, temperature and fluid conditions.
Installation and maintenance practices also affect sealing performance. Reused rings, contaminated grooves, flange misalignment and uneven bolt tightening can all lead to pressure-test failure or leakage during operation.
A correctly selected RTJ gasket helps maintain reliable groove contact and uniform flange closure throughout pressure cycling. It also supports successful BOP and wellhead testing, protects the flange groove during planned maintenance and reduces the risk of leakage, repeated assembly work and unplanned downtime.
How to Select an API 6A Ring Type Joint Gasket
| Selection Step | Information Required | Purpose |
| Confirm the Profile | R, RX or BX | Defines the gasket geometry |
| Confirm the Ring Number | Marking, drawing or parts list | Provides the primary size reference |
| Confirm the Flange | API 6B, API 6BX or OEM | Prevents profile mismatch |
| Identify the Equipment | Wellhead, BOP, tree, valve or manifold | Helps verify the connection |
| State the Pressure Class | 2,000 to 20,000 psi as applicable | Supports flange identification |
| Provide Temperature | Minimum and maximum values | Influences material and coating |
| Describe the Medium | Oil, gas, mud, brine, H₂S, CO₂ or chemicals | Supports corrosion review |
| Confirm the Material | Grade, hardness and CRA requirement | Protects flange compatibility |
| Confirm Sour Service | NACE MR0175 or ISO 15156 | Defines material controls |
| Confirm Documents | MTC, PMI, hardness or third-party inspection | Avoids documentation delays |
Common oilfield flange ratings include 2,000, 3,000, 5,000, 10,000, 15,000 and 20,000 psi. Pressure class alone cannot identify the correct ring.
The process medium may include crude oil, natural gas, sour gas, drilling mud, completion fluid, fracturing fluid, produced water, brine, cement slurry, injection water, methanol, glycol or other well-treatment chemicals.
Manufacturing, Inspection and Traceability
SGPE controls each ring gasket from material verification to final packing.
The production process typically includes:
- Verification of material grade, heat number and certificate
- Preparation of the machining blank
- Machining of the ring profile and critical dimensions
- Finishing of the sealing surfaces
- Removal of burrs and damaging edges
- Dimensional and surface inspection
- Hardness and material verification where required
- Product marking and traceability
- Individual protection and export packing
Critical dimensions may include the pitch diameter, inside diameter, outside diameter, ring height, width, sealing angle, radius and contact geometry.
According to the order, each gasket may carry the ring profile, ring number, material code, heat number, purchase order reference and traceability number.
| Inspection or Document | Supply Scope |
| Visual Inspection | Standard |
| Dimensional Inspection | Standard |
| Ring Profile Verification | Standard |
| Surface Condition Check | Standard |
| Hardness Test | According to the purchase order |
| Material Certificate | According to the agreed scope |
| EN 10204 3.1 Certificate | Available on request |
| Positive Material Identification | Available for stainless steel and CRA orders |
| Coating Inspection | Available for coated gaskets |
| Traceability Matrix | Available on request |
| Third-Party Inspection | SGS, BV, TÜV, ABS, DNV or another approved agency |
An individual ring gasket does not normally require a hydrostatic pressure test. Instead, technicians test the complete wellhead, BOP, valve or manifold flange connection after installation.
RTJ Gasket Installation Guidelines
Before installation, confirm the ring profile, ring number and material. Inspect the gasket for rust, dents, deep scratches, distortion or coating damage.
Clean both flange grooves thoroughly. Remove drilling mud, grease, rust, scale, sand, metal particles and old gasket fragments. Check the groove for corrosion, galling, impact damage and deformation.
Place one clean ring inside the correct groove. Never stack two gaskets. Do not use bolt force to pull severely misaligned flanges together.
Follow the approved cross-pattern and tightening sequence. Use bolt lubricant only when the equipment procedure permits it because lubrication changes the relationship between torque and bolt load.
After assembly, inspect the flange alignment, flange gap, bolts, nut engagement and equipment support. Complete the approved pressure or leak test before placing the equipment into service.
Common RTJ Flange Leakage Causes
| Problem | Possible Cause | Recommended Action |
| Leakage During Initial Test | Wrong ring number or profile | Verify the flange and install the correct gasket |
| Leakage After Reassembly | Reused ring | Install a new gasket |
| Uneven Flange Gap | Misalignment or uneven tightening | Release pressure and realign the connection |
| Groove Damage | Corrosion, galling or impact | Inspect and repair the groove |
| Ring Does Not Seat | Incorrect dimensions or damaged gasket | Verify the profile and replace the ring |
| Repeated Leakage | Flange, groove or bolting issue | Inspect the complete connection |
| Corroded Ring | Unsuitable material or poor storage | Review the material and packing |
| Damaged Coating | Improper handling | Inspect the base material before installation |
If a connection leaks, release all pressure before inspection. Never tighten a pressurized flange unless an approved field procedure specifically permits it.
Can an RTJ Gasket Be Reused?
SGPE recommends installing a new ring whenever an RTJ flange connection is opened.
During the first installation, the flange grooves permanently deform the gasket and create the required metal-to-metal sealing contact. Once the ring is removed, its sealing surfaces may no longer match the groove evenly, even when the gasket appears undamaged.
Reusing an RTJ gasket can lead to pressure-test failure, wellhead leakage, BOP flange leakage, uneven bolt loading and damage to the flange groove. These problems may also result in repeated assembly work, additional rig downtime and higher maintenance costs.
A new replacement ring costs far less than flange repair, repeated pressure testing or an unplanned shutdown. For this reason, a used RTJ gasket should not normally be reinstalled.
Storage and Handling
Store ring gaskets in a clean, dry indoor area. Keep each product inside individual protective packing and separate the inventory by profile, ring number and material.
For offshore transport or long-term storage, use sealed packing, desiccant and suitable corrosion protection.
Prevent impact, bending and metal-to-metal contact. Keep the rings away from seawater, produced water, drilling chemicals, welding, grinding and heavy workshop traffic.
Do not place loose gaskets inside open toolboxes, steel baskets or mixed spare-parts containers.
Replacement, Custom and Complete Gasket Kits
Before confirming a replacement, the engineering team can review flange markings, equipment data, approved drawings, OEM part numbers, critical dimensions and available samples. This review helps verify the correct ring profile, ring number, material, hardness and connection compatibility.
Custom production is also available for non-standard wellhead rings, legacy BOP gasket profiles, OEM replacement rings, special cross-sections and project-specific dimensions. Material options may include stainless steel, corrosion-resistant alloys and sour-service grades, while additional requirements such as high-temperature service, special coatings and customized product marking can be considered according to the approved specification.
Complete gasket kits can be prepared for BOP stacks, wellhead assemblies, Christmas trees, choke manifolds, kill manifolds, frac trees, gate valve packages and workover pressure-control systems.
To support field installation and inventory control, each ring can carry an individual label showing the item number, ring designation, material, quantity, equipment name, installation position, purchase order reference and heat number.
Why Choose SGPE as Your API 6A RTJ Gasket Supplier?
SGPE combines oilfield equipment knowledge with RTJ gasket supply, replacement identification and custom production support. This experience helps the team review not only the ring number, but also the flange type, groove geometry, operating conditions and documentation requirements.
For replacement or non-standard connections, the engineering team can review ring numbers, flange markings, drawings, dimensions and samples before confirming the suitable profile and material. Visual inspection, dimensional verification, hardness testing, material checks and PMI can also be included according to the agreed inspection scope.
Project documentation may include COC, MTC, PMI reports, dimensional records and other required quality documents. SGPE can supply individual emergency quantities as well as complete gasket kits for wellheads, BOP stacks, Christmas trees and manifold systems.
Each gasket can be individually labeled and protected for export shipment. This packing and identification support helps customers manage inventory, match each ring to the correct installation position and arrange delivery to offshore platforms or remote oilfield locations.
Frequently Asked Questions About API 6A Ring Type Joint Gaskets
1. What is an API 6A Ring Type Joint Gasket?
An API 6A Ring Type Joint Gasket is a precision-machined metallic seal for compatible oilfield RTJ flange connections.
The ring sits inside matching grooves. When the flange bolting is tightened, the groove surfaces compress the gasket and create concentrated metal-to-metal contact.
Common applications include wellheads, Christmas trees, API 6A valves, BOP stacks, drilling spools and choke or kill manifolds with approved RTJ connections.
2. What is the difference between Type R, RX and BX gaskets?
Type R uses an oval or octagonal cross-section and commonly fits approved API 6B grooves.
Type RX uses a pressure-energized profile for approved compatible API 6B connections.
Type BX uses a pressure-energized profile for API 6BX flange grooves.
Because the three types have different geometry, they should not be treated as universal replacements.
3. What is the difference between oval and octagonal Type R rings?
An oval ring has a rounded cross-section, while an octagonal ring has flat sealing faces.
Both can provide reliable sealing when they match the approved groove. However, the equipment drawing must control the final selection.
Do not change between the two profiles based only on nominal flange size.
4. Can an RX ring replace a Type R ring?
Some API 6B flange sizes may use related R or RX ring numbers. However, this does not make every R and RX gasket interchangeable.
The profiles have different cross-sections and sealing behavior. The equipment drawing may also approve only one design.
Confirm the flange type, ring number, groove geometry and equipment specification before ordering.
5. Can a Type R or RX gasket fit an API 6BX flange?
No. An API 6BX flange requires the correct Type BX gasket.
Type R and RX rings do not match the BX groove. The wrong profile may prevent proper flange closure, damage the groove or cause leakage during testing.
6. Which ring gasket should I use for a wellhead, BOP or choke manifold?
The actual flange connection determines the correct ring.
API 6A wellheads and Christmas trees may use R, RX or BX gaskets. High-pressure API 16A BOP stacks often use BX rings. API 16C choke and kill equipment may use R, RX or BX profiles where compatible RTJ flanges are installed.
Always confirm the flange marking, ring number and approved drawing.
7. Does an API ring gasket have its own pressure rating?
No. The complete flange assembly determines the pressure rating.
Descriptions such as 10,000 psi, 15,000 psi or 20,000 psi ring gasket normally refer to the connected flange system.
The flange standard, nominal bore, ring number and drawing are still required for correct selection.
8. How do I select the correct RTJ gasket material?
Start with the mating flange material, groove hardness, process medium, operating temperature and corrosion environment.
Soft iron and low carbon steel suit many standard connections where approved. Stainless steel, duplex, super duplex and Inconel 625 may suit more corrosive service.
The most corrosion-resistant alloy is not always the best option. Hardness and flange compatibility must also be reviewed.
9. Can SGPE supply NACE sour-service RTJ gaskets?
Yes. Material options may include stainless steel, duplex, super duplex, Inconel 625 and other approved CRAs.
Provide the applicable NACE MR0175 or ISO 15156 requirement, temperature, H₂S condition, CO₂ content, chloride level, flange material and maximum hardness.
PMI, hardness testing, traceability and EN 10204 3.1 certification can be included according to the order.
10. Can an RTJ gasket be reused?
A new gasket should be installed whenever an RTJ flange connection is opened.
The groove permanently deforms the ring during the first installation. After removal, the used gasket may no longer contact the groove evenly.
Reuse can lead to pressure-test failure, leakage, uneven bolt loading or flange groove damage.
11. How can SGPE identify a replacement gasket when the ring number is unknown?
Send the existing gasket marking, flange marking, equipment manufacturer, model, serial number, OEM part number, pressure class and available drawings.
Measurements and photographs also help. Useful dimensions include the inside diameter, outside diameter, ring height and cross-section.
An approved drawing or clear flange marking normally provides a stronger reference than a previously installed sample.
12. Can SGPE supply custom RTJ gaskets and complete gasket kits?
Yes. Custom rings can be produced from approved drawings, dimensional specifications or suitable samples.
Options include non-standard wellhead gaskets, legacy BOP profiles, OEM replacement rings, special cross-sections, CRA materials and project-specific coatings.
Complete BOP, wellhead, Christmas tree and choke manifold gasket kits are also available with individual identification labels.
Information Required for an Accurate RTJ Gasket Quotation
For accurate selection and pricing, please provide the required gasket profile, such as R, RX or BX, together with the existing or required ring number. For Type R gaskets, confirm whether the required cross-section is oval or octagonal.
Please also state the equipment type, manufacturer and model, exact installation location, flange system, nominal bore and working pressure class. Material grade, maximum allowable hardness, minimum and maximum operating temperature, process medium and sour-service requirements should also be included.
Where applicable, specify the required coating, quantity, PMI, hardness testing, third-party inspection and documentation, such as COC, MTC, EN 10204 3.1 certification and inspection reports. The delivery destination and required date will help SGPE review packing and shipment arrangements.
Request an API 6A Ring Type Joint Gasket Price
SGPE supplies Type R, RX and BX ring gaskets for API 6B, API 6BX and compatible oilfield RTJ flange connections. Options include oval and octagonal Type R rings, wellhead gaskets, BOP flange gaskets, choke manifold gaskets, NACE sour-service rings, Inconel 625 gaskets, OEM replacements and complete gasket kits.
Customers may order single emergency replacements, maintenance quantities or complete sets for wellheads, Christmas trees, BOP stacks, drilling spools and choke or kill manifolds.
E-Mail:
info@sgpe.com
