API 6A Type 6BX 15000 PSI Blind Flange | 103.5MPa High Pressure API Flange
API 6A Type 6BX 15000 PSI blind flanges are high-pressure forged steel flanges designed for critical wellhead, Christmas tree and oilfield pressure control systems.
Manufactured according to API 6A standards, these 6BX blind flanges are engineered for:
- extreme pressure service
- high mechanical strength
- reliable sealing performance
- severe oilfield environments
Rated for:
- 15000 PSI
- 103.5 MPa
API 6BX blind flanges are widely used in:
- wellhead systems
- drilling equipment
- choke & kill manifolds
- offshore oil & gas platforms
- high-pressure valve systems
We are a professional manufacturer and exporter of:
- API 6A Type 6BX Blind Flanges
- API 6BX Welding Neck Flanges
- 15000 PSI API Flanges
- AISI 4130 API Flanges
- High Pressure Forged Steel Flanges
in China.
What is API 6A Type 6BX Blind Flange?
API 6BX blind flanges are forged high-pressure flanges designed for:
- oilfield pressure control equipment
- high-pressure wellhead systems
- drilling and production systems
A blind flange is used to:
- terminate piping systems
- isolate pressure equipment
- seal pressure outlets
Type 6BX flanges are designed specifically for:
- high-pressure service above 5000 PSI
- compact high-strength sealing systems
- ring joint gasket sealing
API 6BX flanges use:
- BX ring gaskets
- RTJ sealing design
- precision-machined grooves
to achieve:
- high-integrity sealing
- pressure containment
- leak prevention
API 6A Standard
API 6A is the international standard covering:
- wellhead equipment
- Christmas tree equipment
- high-pressure oilfield flanges
- pressure-containing components
The standard defines:
- flange dimensions
- pressure ratings
- ring gasket design
- material requirements
- inspection procedures
API 6A flanges are widely used in:
- upstream oil & gas systems
- offshore drilling systems
- HPHT applications
Difference Between API 6B and 6BX Flanges
| Property | API 6B | API 6BX |
|---|---|---|
| Pressure Range | Lower Pressure | Higher Pressure |
| Gasket Type | RX / R | BX Ring |
| Sealing Performance | Standard | Higher Integrity |
| Typical Service | General Oilfield | HPHT Systems |
API 6BX flanges are designed for:
- 5000 PSI and above
- critical high-pressure applications
API 6A Type 6BX 15000 PSI Flange Specifications
| Specification | Details |
|---|---|
| Product Type | Blind Flange / Welding Neck Flange |
| Standard | API 6A |
| Flange Type | Type 6BX |
| Pressure Rating | 15000 PSI / 103.5 MPa |
| Connection Type | RTJ |
| Ring Type | BX Ring |
| Manufacturing Method | Forged |
| Service | High Pressure Oilfield |
Available Materials for API 6BX Flanges
Carbon Steel
- ASTM A105 / A105N
- ASTM A694 F42 / F52 / F60 / F65 / F70
Low Temperature Steel
- ASTM A350 LF2 CL2
- ASTM A350 LF6 CL2
Alloy Steel
- ASTM A182 F11
- ASTM A182 F22
- ASTM A182 F91
- AISI 4130
- AISI 4140
- AISI 4340
Stainless Steel
- ASTM A182 F304 / F304L
- ASTM A182 F316 / F316L
- ASTM A182 F321
- ASTM A182 F347
Duplex Stainless Steel
- ASTM A182 F51
- ASTM A182 F53
- ASTM A182 F55
Nickel Alloy Materials
- Inconel 625
- Monel 400
- Hastelloy C276
- Alloy 20
Material selection depends on:
- pressure rating
- operating temperature
- corrosion environment
- sour service requirements
AISI 4130 API 6BX Flanges
AISI 4130 is one of the most commonly used alloy steel materials for:
- API 6BX flanges
- wellhead systems
- HPHT oilfield applications
AISI 4130 provides:
- high tensile strength
- excellent toughness
- good weldability
- reliable pressure resistance
4130 API flanges are widely used in:
- offshore drilling systems
- subsea wellheads
- choke manifolds
API 6BX 15000 PSI Blind Flange Dimensions
API 6BX flanges are manufactured according to API 6A dimensional requirements.
| Size | OD (mm) | Bolt Circle (mm) | Ring Number |
|---|---|---|---|
| 1 13/16” | 210 | 160.3 | BX151 |
| 2 1/16” | 220 | 174.6 | BX152 |
| 3 1/16” | 290 | 230.2 | BX154 |
| 4 1/16” | 360 | 290.5 | BX155 |
| 7 1/16” | 505 | 428.6 | BX156 |
| 9” | 650 | 552.4 | BX157 |
| 11” | 815 | 711.2 | BX158 |
| 13 5/8” | 885 | 771.5 | BX159 |
| 18 3/4” | 1160 | 1016 | BX164 |
Detailed API 6A flange dimension charts are available upon request.
BX Ring Gasket Design
API 6BX flanges use:
- BX ring type gaskets
- pressure energized sealing
- RTJ groove design
BX ring gaskets provide:
- high-integrity sealing
- metal-to-metal contact
- reliable sealing under extreme pressure
BX rings are designed according to:
- API 6A
- ASME B16.20
Pressure Rating of API 6BX Flanges
Available pressure ratings include:
- 2000 PSI
- 3000 PSI
- 5000 PSI
- 10000 PSI
- 15000 PSI
- 20000 PSI
API 6BX flanges are specifically intended for:
- high-pressure oilfield systems
- severe drilling environments
Heat Treatment of API 6BX Forged Flanges
Depending on material grade, flanges may be supplied in:
- normalized condition
- quenched and tempered condition
- solution annealed condition
Heat treatment improves:
- mechanical strength
- toughness
- pressure resistance
- structural reliability
Manufacturing Process of API 6BX Flanges
Typical manufacturing process includes:
- open die forging
- ring forging
- heat treatment
- CNC machining
- RTJ groove machining
- drilling
- dimensional inspection
Strict quality control ensures:
- groove accuracy
- flange flatness
- sealing integrity
Inspection and Testing
API 6BX flanges may undergo:
- chemical composition analysis
- mechanical testing
- hardness testing
- ultrasonic testing (UT)
- magnetic particle testing (MT)
- dimensional inspection
- PMI testing
Optional testing includes:
- HIC testing
- SSC testing
- sour service qualification
NACE MR0175 Compliance
API 6BX flanges can be manufactured according to:
- NACE MR0175
- ISO 15156
- NACE MR0103
Additional sour service requirements may include:
- hardness control
- HIC testing
- low sulfur chemistry
NACE compliant API flanges are widely used in:
- sour gas wells
- offshore production systems
- HPHT oilfield applications
API 6BX vs ASME B16.5 Flanges
| Property | API 6BX | ASME B16.5 |
|---|---|---|
| Pressure Rating | Much Higher | Standard Industrial |
| Sealing Type | BX RTJ | RF / RTJ |
| Oilfield Use | Excellent | Limited |
| HPHT Service | Designed For | Limited |
API 6BX flanges are specifically engineered for:
- oilfield high-pressure systems
- HPHT drilling applications
Frequently Asked Questions
What is API 6BX flange?
API 6BX flange is a high-pressure RTJ flange used in oilfield wellhead and drilling systems.
What is the pressure rating of 6BX flange?
Common pressure ratings include:
- 5000 PSI
- 10000 PSI
- 15000 PSI
- 20000 PSI
What gasket is used with API 6BX flange?
API 6BX flanges use:
- BX ring gaskets
What material is used for API 6BX flanges?
Common materials include:
- AISI 4130
- ASTM A105
- ASTM A694
- stainless steel alloys
Are API 6BX flanges forged?
Yes. API 6BX flanges are forged high-pressure flanges.
Can API 6BX flanges meet NACE MR0175 requirements?
Yes. NACE compliant flanges can be manufactured for sour service applications.
Related Products
API 6A Flanges
- API 6B Welding Neck Flanges
- API 6BX Blind Flanges
- API RTJ Flanges
Oilfield Ring Gaskets
- BX Ring Gaskets
- RX Ring Gaskets
- API Ring Joint Gaskets
High Pressure Fasteners
- ASTM A193 B7 Stud Bolts
- ASTM A320 L7 Stud Bolts
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AISI 4130 API 6A Type 6BX 15000PSI Blind / Welding Neck Flange Dimension
Dimension of AISI 4130 15000PSI(103.5MPA) type 6BX blind/Welding Neck API 6A Flange
| Size | B | OD | C | E1 | Q | G | K | T | J1 | J2 | J3 | J4 | R | BC | N | H | Ring Number |
| 1 13/16″ | 46.8 | 210 | 3 | – | 5.56 | 77.77 | 106 | 45.3 | 97.6 | 71.4 | 47.6 | – | 10 | 160.3 | 8 | 26 | 151 |
| 2 1/16″ | 53.2 | 220 | 3 | – | 5.95 | 86.23 | 114 | 50.8 | 111.1 | 82.5 | 54 | – | 10 | 174.6 | 8 | 26 | 152 |
| 2 9/16″ | 65.9 | 255 | 3 | – | 6.75 | 102.77 | 133 | 57.2 | 128.6 | 100 | 57.1 | – | 10 | 200 | 8 | 29 | 153 |
| 3 1/16″ | 78.6 | 290 | 3 | – | 7.54 | 119 | 154 | 64.3 | 154 | 122.2 | 63.5 | – | 10 | 230.2 | 8 | 32 | 154 |
| 4 1/16″ | 104 | 360 | 3 | – | 8.33 | 150.62 | 194 | 78.6 | 195.3 | 158.7 | 73 | – | 10 | 290.5 | 8 | 39 | 155 |
| 5 1/8″ | 131 | 420 | 3 | 9.5 | 9.53 | 176.66 | 225 | 98.5 | 244.5 | 200 | 81.8 | 6.4 | 16 | 342.9 | 12 | 42 | 169 |
| 7 1/16″ | 180.2 | 505 | 6 | 11.1 | 11.11 | 241.83 | 305 | 119.1 | 325.4 | 276.2 | 92.1 | 7.9 | 16 | 428.6 | 16 | 42 | 156 |
| 9 “ | 229.4 | 650 | 6 | 12.7 | 12.7 | 299.06 | 381 | 146.1 | 431.8 | 349.2 | 123.8 | 14.2 | 16 | 552.4 | 16 | 51 | 157 |
| 11″ | 280.2 | 815 | 6 | 14.3 | 14.29 | 357.23 | 454 | 187.4 | 584.2 | 427 | 235.7 | 12.7 | 16 | 711.2 | 20 | 54 | 158 |
| 13 5/8″ | 346.9 | 885 | 6 | 15.9 | 15.88 | 432.64 | 541 | 204.8 | 595.3 | 528.6 | 114.3 | 17.5 | 25 | 771.5 | 20 | 61 | 159 |
| 18 3/4″ | 477 | 1160 | 6 | 18.3 | 18.26 | 577.9 | 722 | 255.6 | 812.8 | 730.2 | 155.6 | 35.1 | 25 | 1016 | 20 | 80 | 164 |
1. RING NUMBER BX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH
