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Blind Flanges

Engineered as a solid, hole-free disc, the blind flange delivers absolute pipeline closure with zero flow-through. Manufactured via precision forging or medium-plate cutting, it offers superior mechanical strength, dense grain structure, and excellent corrosion resistance across carbon, alloy, and stainless steel grades. Fully detachable and re-installable, it simplifies maintenance, isolates process media, and meets ASME B16.5, DIN, and BS standards  making it the preferred sealing solution for oil & gas, chemical, water treatment, and petrochemical facilities worldwide.
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Description

Engineered as a solid, hole-free disc, the blind flange delivers absolute pipeline closure with zero flow-through. Manufactured via precision forging or medium-plate cutting, it offers superior mechanical strength, dense grain structure, and excellent corrosion resistance across carbon, alloy, and stainless steel grades. Fully detachable and re-installable, it simplifies maintenance, isolates process media, and meets ASME B16.5, DIN, and BS standards  making it the preferred sealing solution for oil & gas, chemical, water treatment, and petrochemical facilities worldwide.

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Design Features

Feature Details
Body Design Solid centre disc with full bolt-circle face; no bore opening; uniform wall thickness for maximum pressure containment
Connection Type Full-face bolted assembly; compatible with raised face (RF) and ring-type joint (RTJ) mating flanges
Leak Protection Precision-machined sealing face paired with spiral-wound or ring-joint gaskets; zero-leakage under rated pressure
Corrosion Resistance Grade-specific alloy selection; optional epoxy or galvanised coating; stainless grades rated for aggressive media
Pressure Handling Rated Class 150 through Class 2500 per ASME B16.5; custom heavy-wall sections available for hyperbaric service
Temperature Resistance –196 °C to +600 °C depending on material grade; low-temperature LF2 and high-temperature F91 grades stocked
Maintenance Fully removable and re-usable; bolt-on design allows rapid inspection and re-installation without pipe modification
Durability Forged construction provides dense, defect-free grain flow; superior fatigue and impact resistance vs. cast alternatives
Automation Compatibility Suitable for automated bolting systems; consistent bolt-hole pitch per ASME B16.5 PCD standards
Industrial Standards ASME B16.5 · BS 3293 · DIN 86029 · MSS SP-44 · ASTM A105 / A182 / A350

Technical Specifications

Specification Details
Product Type Blind Flange (Blind Disk / Flanged Pipe Plug)
Size Range ½″ to 24″ standard; custom up to 60″
Material Grade ASTM A105 (CS), A182 F5/F9/F11/F22/F91 (Alloy), A182 F304/L, F316/L (SS)
End Connection Raised Face (RF), Ring-Type Joint (RTJ)
Pressure Rating Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500
Temperature Range –196 °C to +600 °C (grade-dependent)
Seat Material N/A – solid plate; gasket seat machined to ASME B16.20
Operation Type Static closure; manual bolt-on installation
Port Type No bore (blind / solid face)
Surface Finish Serrated concentric / smooth finish per ASME B16.5; Ra 3.2–6.3 μm
Applicable Media Steam, water, hydrocarbons, acids, gases, LNG, chemicals
Manufacturing Std. ASME B16.5, BS 3293, DIN 86029, MSS SP-44

Benefits & Application

Key Benefits Target Applications
High durability & long service life Oil & Gas upstream / downstream pipelines
Full corrosion & oxidation resistance Chemical & petrochemical processing plants
Zero-leakage sealing performance Water treatment & municipal utilities
Minimal maintenance requirement Pharmaceutical & food-grade processing
Easy replacement without pipe rework Power generation & steam distribution
Rated for extreme pressure & temperature Marine, offshore & subsea installations
Wide grade availability for any media HVAC, pulp & paper, cryogenic service
Compliant with global export standards LNG terminals & refinery shut-off points

Testing Parameters

Test Type Description
Hydrostatic (Shell) Test 1.5× rated pressure applied to body for minimum 30 seconds; verifies structural integrity and wall soundness per ASME/API 598
Pneumatic Test Air or inert gas at 1.1× rated pressure; used where water contamination is not permissible; bubble-soap or submerged leak detection
Seat Leakage Test Conducted on mating flange joint assembly; confirms zero-bypass across sealing face and gasket interface
Pressure Endurance Test Cyclic pressure loading at rated class over extended duration; validates fatigue resistance of forged body
Material Inspection PMI (Positive Material Identification) via XRF; mill test certificate (MTC) per EN 10204 3.1 / 3.2 on request
Dimensional Accuracy 100% dimensional check vs. ASME B16.5 / B16.47 drawings; OD, bolt-circle, thickness, and face finish verified
Surface Finish Inspection Sealing face Ra measured per ASME B46.1; visual and MT/PT NDT for surface defects and cracks
Quality Certification ISO 9001:2015 QMS; NACE MR0175 compliance for sour service; CE marking available for European export

Blind Flanges

Engineered as a solid, hole-free disc, the blind flange delivers absolute pipeline closure with zero flow-through. Manufactured via precision forging or medium-plate cutting, it offers superior mechanical strength, dense grain structure, and excellent corrosion resistance across carbon, alloy, and stainless steel grades. Fully detachable and re-installable, it simplifies maintenance, isolates process media, and meets ASME B16.5, DIN, and BS standards  making it the preferred sealing solution for oil & gas, chemical, water treatment, and petrochemical facilities worldwide.

Design Features

Feature Details
Body Design Solid centre disc with full bolt-circle face; no bore opening; uniform wall thickness for maximum pressure containment
Connection Type Full-face bolted assembly; compatible with raised face (RF) and ring-type joint (RTJ) mating flanges
Leak Protection Precision-machined sealing face paired with spiral-wound or ring-joint gaskets; zero-leakage under rated pressure
Corrosion Resistance Grade-specific alloy selection; optional epoxy or galvanised coating; stainless grades rated for aggressive media
Pressure Handling Rated Class 150 through Class 2500 per ASME B16.5; custom heavy-wall sections available for hyperbaric service
Temperature Resistance –196 °C to +600 °C depending on material grade; low-temperature LF2 and high-temperature F91 grades stocked
Maintenance Fully removable and re-usable; bolt-on design allows rapid inspection and re-installation without pipe modification
Durability Forged construction provides dense, defect-free grain flow; superior fatigue and impact resistance vs. cast alternatives
Automation Compatibility Suitable for automated bolting systems; consistent bolt-hole pitch per ASME B16.5 PCD standards
Industrial Standards ASME B16.5 · BS 3293 · DIN 86029 · MSS SP-44 · ASTM A105 / A182 / A350

Technical Specifications

Specification Details
Product Type Blind Flange (Blind Disk / Flanged Pipe Plug)
Size Range ½″ to 24″ standard; custom up to 60″
Material Grade ASTM A105 (CS), A182 F5/F9/F11/F22/F91 (Alloy), A182 F304/L, F316/L (SS)
End Connection Raised Face (RF), Ring-Type Joint (RTJ)
Pressure Rating Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500
Temperature Range –196 °C to +600 °C (grade-dependent)
Seat Material N/A – solid plate; gasket seat machined to ASME B16.20
Operation Type Static closure; manual bolt-on installation
Port Type No bore (blind / solid face)
Surface Finish Serrated concentric / smooth finish per ASME B16.5; Ra 3.2–6.3 μm
Applicable Media Steam, water, hydrocarbons, acids, gases, LNG, chemicals
Manufacturing Std. ASME B16.5, BS 3293, DIN 86029, MSS SP-44

Benefits & Application

Key Benefits Target Applications
High durability & long service life Oil & Gas upstream / downstream pipelines
Full corrosion & oxidation resistance Chemical & petrochemical processing plants
Zero-leakage sealing performance Water treatment & municipal utilities
Minimal maintenance requirement Pharmaceutical & food-grade processing
Easy replacement without pipe rework Power generation & steam distribution
Rated for extreme pressure & temperature Marine, offshore & subsea installations
Wide grade availability for any media HVAC, pulp & paper, cryogenic service
Compliant with global export standards LNG terminals & refinery shut-off points

Testing Parameters

Test Type Description
Hydrostatic (Shell) Test 1.5× rated pressure applied to body for minimum 30 seconds; verifies structural integrity and wall soundness per ASME/API 598
Pneumatic Test Air or inert gas at 1.1× rated pressure; used where water contamination is not permissible; bubble-soap or submerged leak detection
Seat Leakage Test Conducted on mating flange joint assembly; confirms zero-bypass across sealing face and gasket interface
Pressure Endurance Test Cyclic pressure loading at rated class over extended duration; validates fatigue resistance of forged body
Material Inspection PMI (Positive Material Identification) via XRF; mill test certificate (MTC) per EN 10204 3.1 / 3.2 on request
Dimensional Accuracy 100% dimensional check vs. ASME B16.5 / B16.47 drawings; OD, bolt-circle, thickness, and face finish verified
Surface Finish Inspection Sealing face Ra measured per ASME B46.1; visual and MT/PT NDT for surface defects and cracks
Quality Certification ISO 9001:2015 QMS; NACE MR0175 compliance for sour service; CE marking available for European export

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