Stainless Steel Spectacle Flange Supplier in Mumbai
The Metallurgy and Surface Finish Engineering
The industrial operational lifespan and sealing safety of a heavy stainless steel spectacle blind are determined by its exact metallurgical selection and the precision of its machined face serrations.
Chemical Composition and Stainless Grade Performance
Stainless steel spectacle flanges rely on a precise ratio of chromium (minimum 18%) and nickel (minimum 8%). This precise composition allows the flange to instantaneously form an inert, self-healing chromium oxide passive layer upon exposure to the atmosphere, rendering it highly resistant to atmospheric corrosion and oxidizing media. Common grades include SS 304/304L for general commercial usage and SS 316/316L, which incorporates 2-3% Molybdenum to drastically improve its resistance to chloride-induced pitting and crevice corrosion in marine, coastal, and chemical processing lines. The low-carbon "L" variants ensure protection against carbide precipitation during field welding.
Precision Machining and Gasket Seating
Equally critical is the dimensional machining of the sealing face. When tightening a spectacle flanged connection, the mating surfaces must compress the gasket with complete uniformity. Our specialized CNC turning centers machine precise phonographic or concentric serrations into the Raised Face (RF) or Flat Face (FF) profiles on both discs, maintaining a strict 125–250 micro-inch AARH (Arithmetic Average Roughness Height) surface finish. This targeted roughness forces the gasket material to cold-flow directly into the micro-grooves, creating an impenetrable, leak-proof barrier capable of containing Class 150# to Class 2500# process streams. For extreme services, high-precision Ring Type Joint (RTJ) grooves are machined to accept metallic ring gaskets.
Primary Inline Blank Configurations
Depending on line weights, overall diameter clearance limitations, and general pipeline routing parameters, we manufacture a complete selection of pipeline blanking configurations:
- Spectacle Blind (ASME B16.48): The standard figure-8 single forge profile combining both the open and closed rings on a shared connecting web. Ideal for small-to-mid size lines (up to 24-inch nominal parameters).
- Paddle Blanks / Spades (Slip Blinds): A single solid disc featuring an extended handle, utilized in large-diameter configurations where a full spectacle assembly would be too heavy for manual line rotation.
- Paddle Spacers (Spacer Rings): The matching open-bore component paired with a paddle blank, bolted into place to maintain uninterrupted fluid mechanics when the line is turned back to normal operation.
Dimensional and Material Specifications
Our production engineering strictly follows global dimensional codes to ensure hassle-free integration with global piping infrastructure.
| Parameter |
Specification Details |
| Design Standards |
ASME B16.48 (Governing standard for line blanks), API 590, DIN, EN 1092-1 |
| Material Grades |
ASTM A182 F304, F304L, F316, F316L, F321, F347, F904L, Duplex F51/F60 |
| Pressure Classes |
Class 150, 300, 600, 900, 1500, 2500 / PN6 to PN250 |
| Facing Types |
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ Male/Female/Grooved) |
| Size Range |
1/2” NB up to 24” NB under ASME B16.48 (Custom large-diameter dimensions up to 60" available) |
| Testing Regimens |
Ultrasonic Flaw Detection, 100% PMI testing, LPT, Face Flatness Evaluation, Dimensional Verification |
Driving B2B Procurement via an Authorized Flanges Dealer in Mumbai
For global engineering, procurement, and construction (EPC) firms managing large-scale industrial projects, handling thousands of pipeline connections is a complex logistical task. Partnering with a dedicated distribution channel in Mumbai gives you a distinct operational edge.
We provide volume-based commercial discounts, comprehensive material traceability certifications (MTC EN 10204 3.1/3.2), and durable, sea-worthy packaging designed to prevent edge dents or mating radius distortion during transport. Additionally, our sales engineers provide direct technical support to procurement teams, verifying bolt-circle dimensions, pressure-temperature ratings, and backing ring compatibility to match project isometric data perfectly.
Stainless Steel Spectacle Flange Exporter in Mumbai
Fulfilling Global Contracts as a Top Flanges Exporter from Mumbai
Our focus on precision machining and zero-defect forging has earned strong international trust. Operating from the export hub of Mumbai, we regularly ship high-reliability stainless steel spectacle blind flanges to natural gas processing hubs in the Middle East, high-pressure steam power plants in Europe, and chemical refineries across Southeast Asia.
Every export order passes through a strict final quality checkpoint, including full dimensional analysis, face thickness validation, and 100% PMI validation. We package shipments in heavy-duty, export-grade wooden cases equipped with moisture-resistant barriers and tailored face protectors. This ensures your components arrive at the project site ready for immediate installation.
Technical Specifications Summary
| Spectacle Flanges – Technical Specifications |
Details |
| Size Range |
1/2" to 24" as per standard ASME B16.48 (Custom sizes up to 60" available) |
| Pressure Class |
150 / 300 / 600 / 900 / 1500 / 2500 LBS, PN 6 to PN 250 |
| Configuration Options |
Figure-8 Spectacle Blind, Paddle Blank (Spade), Paddle Spacer Ring |
| Face Type |
RF (Serrated), FF, RTJ (Ring Groove) |
| Manufacturing Process |
Hot Forged / Precision Machined & Matched Face Thicknesses |
| Testing Protocols |
Hydrostatic, PMI, Face Flatness tracking, Hardness, Ultrasonic, Liquid Penetrant |
| Certification |
EN 10204 3.1 / 3.2 Mill Test Certificate, Full NACE MR0175 Compliance Available |
