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Blind (BL, BLRF, BLFF) NACE MR0175/ISO15156 Flanges
3000.0 INR/Piece
Product Details:
- Grade ASTM A105, A182 F304/F316, F51, F53, F55, other NACE compliant grades
- Application Oil & Gas Industry, Chemical Industry, Offshore, Refineries, Petrochemical, Pressure Vessel
- Dimension (L*W*H) As per ASME/ANSI, DIN, EN, JIS standards and customer requirement
- Feature Corrosion Resistant, High Strength, Leak Proof, Durability
- Purity Industrial Grade
- Product Type Blind Flange (BL, BLRF, BLFF)
- Material Stainless Steel, Alloy Steel, Carbon Steel (as per NACE requirements)
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Blind (BL, BLRF, BLFF) NACE MR0175/ISO15156 Flanges Price And Quantity
- 3000.0 INR/Piece
- 1 Piece
Blind (BL, BLRF, BLFF) NACE MR0175/ISO15156 Flanges Product Specifications
- Round
- ASTM A105, A182 F304/F316, F51, F53, F55, other NACE compliant grades
- NACE MR0175/ISO15156
- Blind Flange (BL, BLRF, BLFF)
- Stainless Steel, Alloy Steel, Carbon Steel (as per NACE requirements)
- 1/2 to 48 (DN15 to DN1200)
- Oil & Gas Industry, Chemical Industry, Offshore, Refineries, Petrochemical, Pressure Vessel
- 150# to 2500#
- Industrial Grade
- Forged
- As per ASME/ANSI, DIN, EN, JIS standards and customer requirement
- Bright, Polished, Smooth
- Welded, Bolted
- Silver, Metallic
- Corrosion Resistant, High Strength, Leak Proof, Durability
- Varies as per size and pressure class
- Suitable for Sour Service (H2S Environments) as per NACE MR0175
- Wooden Cases, Pallets, or as customer requirement
- As per NACE MR0175/ISO15156
- Bolt Holes as per ANSI/ASME B16.5/B16.47
- RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint)
- Plain, Serrated, Spiral Groove
- Up to 650C (depending on material grade)
- Close Dimensional Tolerance as per Standards
- Machined Surface with Rust Preventive Coating
Product Description
NACE MR0175 / ISO 15156 compliant Blind Flanges (BL, BLRF, BLFF) are solid, un-bored forged piping discs specifically metallurgical-processed and tested to prevent Sulfide Stress Cracking (SSC), Stress Corrosion Cracking (SCC), and Hydrogen-Induced Cracking (HIC) in sour oil and gas upstream and refining environments containing hydrogen sulfide ($text{H}_2text{S}$).
1. NACE MR0175 / ISO 15156 Metallurgical & Manufacturing Requirements
Because blind flanges absorb complete bending moments and full internal line pressure across their entire center surface, NACE MR0175 enforces strict metallurgical thresholds:
Maximum Hardness Control
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Carbon and Low-Alloy Steels (ASTM A105, A350 LF2, A694): Maximum allowable hardness is 22 HRC ($le 187text{ HBW}$).
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Austenitic Stainless Steels (304/304L, 316/316L): Solution annealed condition with maximum hardness typically capped at 22 HRC ($le 200text{ HBW}$).
-
Duplex Stainless Steels (2205 / F51): Solution annealed with ferrite content maintained between $35text{--}55%$ and maximum hardness of 28 HRC ($le 290text{ HBW}$).
Heat Treatment Requirements
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Carbon steel forgings must undergo full Normalization (A105N / A350 LF2), Normalizing and Tempering, or Quenching and Tempering to eliminate residual stresses from forging and machining.
Chemical Composition Restrictions
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Sulfur Limits: Typically restricted to $text{S} le 0.010%$ (or $le 0.005%$ for critical sour service) to prevent manganese sulfide stringers that initiate Hydrogen-Induced Cracking (HIC).
-
Carbon Equivalent (CE): Kept below $0.43%$ for carbon steels to ensure weldability and prevent hard spots.
2. Structural Types & Facing Configurations
| Acronym | Type Designation | Sealing Surface Profile | Key Service Application |
| BL | Blind Flange | Generic term for solid un-bored flange disc. | System terminations, vessel nozzles, hydro-test blanks. |
| BLRF | Blind Raised Face | Raised contact area ($1.6text{ mm}$ or $6.4text{ mm}$) with spiral serrations ($125text{--}250text{ AARH}$). | Class 150 to Class 600 sour oil/gas lines using spiral wound gaskets with NACE-compliant inner/outer rings. |
| BLFF | Blind Flat Face | Flat surface across the full face without a raised step. | Mating against cast iron equipment, flat-faced valves, or low-pressure flat gaskets to prevent flange cracking during torquing. |
| BLRTJ | Blind Ring Type Joint | Machined annular metallic groove housing an oval or octagonal solid ring gasket. | High-pressure sour service (Class 600 through Class 2500, and API 6A 5K15K PSI). |
3. Applicable Standards & Specifications
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ASME B16.5: Pipe Flanges and Flanged Fittings ($text{NPS } 1/2 text{ to } 24$, Class 150, 300, 400, 600, 900, 1500, 2500).
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ASME B16.47 Series A & B: Large Diameter Steel Flanges ($text{NPS } 26 text{ to } 60$).
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NACE MR0175 / ISO 15156: Parts 1, 2 (Carbon/Low-Alloy Steels), and 3 (Corrosion-Resistant Alloys).
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NACE MR0103 / ISO 17945: Materials resistant to sulfide stress cracking in oil refining environments (downstream processing).
4. Common NACE MR0175 Material Specifications
| Material Grade | Specification | Temperature & Environment Suitability |
| Normalized Carbon Steel | ASTM A105N | Ambient sour lines down to $-29^circtext{C}$ with max 22 HRC. |
| Low-Temp Carbon Steel | ASTM A350 LF2 Class 1 | Cold-climate / cryogenic sour service down to $-46^circtext{C}$. |
| High-Yield Carbon Steel | ASTM A694 F52 / F60 / F65 | High-pressure sour gas transmission pipelines. |
| Stainless Steel 316 / 316L | ASTM A182 F316 / F316L | Chloride and $text{H}_2text{S}$ environments; highly resistant to pitting. |
| Duplex / Super Duplex | ASTM A182 F51 / F53 | Extreme offshore sour service, high chloride, and high strength. |
| Nickel Alloy | ASTM A182 F44 / Inconel 625 | Extreme acid gas, high partial pressure $text{H}_2text{S}$ service. |
Designed for Critical Sour Service Applications
These NACE-compliant blind flanges are engineered for environments containing hydrogen sulfide (H2S), making them essential for safe operation in upstream, midstream, and downstream facilities. Their robust build prevents fluid or gas leaks, ensuring operational safety and longevity even under high pressure and extreme conditions.
Wide Range of Materials and Standards Supported
Manufactured from ASTM A105, A182 F304/F316, F51, F53, F55, and other NACE-certified grades, these flanges meet international standards such as ASME/ANSI, DIN, EN, and JIS. This versatility allows seamless integration into diverse piping systems while delivering consistent strength and purity across applications.
FAQ's of Blind (BL, BLRF, BLFF) NACE MR0175/ISO15156 Flanges:
Q: What industries are these NACE MR0175/ISO15156 blind flanges suitable for?
A: These blind flanges are used primarily in the oil and gas, petrochemical, chemical processing, offshore platforms, and refinery sectors. Their corrosion resistance and compliance with NACE standards make them ideal for sour service operations involving hydrogen sulfide environments.Q: How do I choose between Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) face types?
A: The choice of face type depends on your piping design and sealing requirements. Raised Face (RF) is commonly used for most applications, Flat Face (FF) for low-pressure, and Ring Type Joint (RTJ) for high-pressure and high-temperature services where a metal-to-metal seal is needed.Q: What is the process for ensuring these flanges meet NACE MR0175/ISO15156 standards?
A: Each flange is manufactured from certified materials, with chemical composition and hardness strictly controlled as per NACE MR0175/ISO15156. Thorough inspection and testing are performed to guarantee resistance to hydrogen sulfide-induced cracking and ensure dimensional conformity.Q: When should I use blind flanges in my pipeline system?
A: Blind flanges are used to seal the end of piping systems or pressure vessel openings, allowing for easy access during inspection, maintenance, or future expansion. They are essential when a secure, removable closure is needed.Q: Where are these flanges typically installed?
A: These flanges are installed at the ends of pipelines, valves, or pressure vessels in industrial facilities handling corrosive or sour fluids, ensuring safety during shutdowns or maintenance procedures.Q: What benefits do NACE-compliant blind flanges offer over standard flanges?
A: NACE-compliant blind flanges provide superior resistance against sulfide stress cracking and corrosion in sour service applications, delivering enhanced safety, durability, and reliability in harsh industrial environments.Q: How are the flanges packaged and protected for delivery?
A: Flanges are packed in sturdy wooden cases or pallets, with a machined surface finish and rust preventive coating to prevent damage and corrosion during transit. Packaging can also be customized as per customer requirements.Tell us about your requirement
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- Phone : 08045800544
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