Series A & B Flanges Suppliers
ASME B16.47 Standard Flanges: Dimensions | Specifications | Material Grade | Standards | About B16.47 Series A & B Flanges | All Product Types
ASME B16.47 Series A & B Flanges are large-diameter industrial flanges used in high-pressure and high-flow piping systems ranging from 26″ to 60″ nominal bore (DN650 to DN1500). This standard covers weld neck flanges and blind flanges specifically designed for demanding environments like oil & gas, petrochemical, refining, offshore, and power generation sectors. The flanges conform to strict pressure ratings from Class 75 to Class 900, ensuring performance reliability in critical applications.
ASME B16.47 is split into two series:
The standard defines not just dimensions and pressure-temperature ratings, but also tolerances, bolt hole alignment, flange thickness, and gasket compatibility. Each flange is precision machined to meet tight specifications ensuring leak-proof connections and compatibility with international pipe schedules and fittings.
We manufacture and supply both Series A & B flanges with custom drilling templates, surface finishes (Stock Finish, Spiral Serrated, Smooth), and coating options on request. Our flanges are tested as per international quality protocols and supplied with full EN 10204 3.1 / 3.2 certification and NACE, PED, IBR approvals.
Whether you're looking for ASME B16.47 flange dimensions, weight chart, or a reliable exporter of large diameter flanges, Nutech offers a complete solution with global delivery and technical support.
For complete technical details, including dimensions, pressure rating classes, weight charts, sizes, tolerances, and material specifications of our ANSI B16.47 Series A & B Standard Flanges, please download the full Catalog PDF below.
Specification | Details |
---|---|
Flange Standard | ASME B16.47 Series A (MSS SP-44), ASME B16.47 Series B (API 605) |
Flange Types | Weld Neck (WN), Blind (BL) |
Size Range | 26″ to 60″ (DN650 to DN1500) |
Pressure Ratings | Class 75, 150, 300, 400, 600, 900 |
Face Types | Raised Face (RF), Ring Type Joint (RTJ) |
Design Features | Defined bolt circle diameters, wall thicknesses, facing finishes, and tolerances as per ASME B16.47 |
Drilling Template | Matches companion flanges according to B16.47 bolt hole specifications (Series A & B) |
Surface Finish | Stock Finish (125–250 AARH), Spiral Serrated, Smooth Face, RTJ Grooves |
Inspection & Testing | Hydro Test, PMI, Dimensional Inspection, UT/MPI on request |
Applicable Gaskets | Spiral Wound, RTJ Ring, Full Face, Raised Face Gaskets |
Marking | Standard marking per ASME B16.47 including size, pressure class, heat number, and manufacturer’s logo |
Application Industries | Oil & Gas, Petrochemical, Refinery, LNG Terminals, Offshore Platforms, Power Plants, Marine Infrastructure |
Origin | Made in India (by Nutech Overseas) |
Export Network | USA, Europe, and Middle East |
Material Category | B16.47 Flange Grades |
---|---|
Stainless Steel B16.47 Flange | ASTM A182 F304 / F304L / F304H, F316 / F316L / F316Ti, F310, F309S, F317 / F317L, F321 / F321H, F347 / F347H, F904L, ASTM A351 CF3 / CF3M / CF8 / CF8M / CF8C, DIN 1.4301, 1.4306, 1.4307, 1.4311, 1.4401, 1.4404, 1.4408, 1.4409, 1.4541, 1.4571, 1.4550, 1.4435, 1.4539 |
Duplex Steel B16.47 Flange | ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61, UNS S31803 / S32205 |
Super Duplex Steel B16.47 Flange | ASTM A182 F53 / F55 / F57 / F59 / F60 / F61, UNS S32750 / S32760 |
Carbon Steel B16.47 Flange | ASTM A105 / A105N, ASTM A350 LF2, ASTM A694 F52 / F56 / F60 / F65 / F70 / F80, ASTM A216 WCB, DIN 1.0460 / 1.0402 / 1.0619, Die Steel, Mild Steel |
Alloy Steel B16.47 Flange | ASTM A182 F5 / F9 / F11 / F12 / F22 / F91, AISI 4130 / 4140 |
Nickel Alloy B16.47 Flange | Nickel 200 / 201, ASTM B564 |
Monel B16.47 Flange | Monel 400 (UNS N04400), Monel K500 (UNS N05500), ASTM B564 |
Inconel B16.47 Flange | Inconel 600 / 601 / 625 / 690 / 718 / 783 / X750, ASTM B564 |
Incoloy B16.47 Flange | Incoloy 800 / 800H / 800HT (UNS N08800), Incoloy 825 (UNS N08825), Incoloy 925, ASTM B564 |
Hastelloy B16.47 Flange | Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X, ASTM B564 |
Alloy 20 B16.47 Flange | Alloy 20 / 20Cb-3, Carpenter® 20, ASTM B462 |
254 SMO B16.47 Flange | SMO 254 / 6Mo, UNS S31254, DIN 1.4547, ASTM A182 |
Copper Nickel B16.47 Flange | Copper Nickel 90/10 (C70600), 70/30 (C71500), UNS C71640, ASTM B61 / B62 / B151 / B152 |
Copper B16.47 Flange | TP1, TP2, T1, T2, C10100–C12300, C14200–C17200, C21000–C71520, including C10930, C11000, C11400, C12000, C12200, C26000, C28000, C33000, C44300, C70600, etc. |
Brass B16.47 Flange | Grades 3602, 2604, H59, H62, etc. |
Aluminium B16.47 Flange | Aluminium Grades 5052, 6061, 6063, 2017, 7075, etc. |
Titanium B16.47 Flange | ASTM B381 Gr.1 / Gr.2 / Gr.4 / Gr.5 / Gr.7, UNS R50250 / R50400 / R50550 / R50700 / R52400 / R53400 / R56320 / R56400 |
Other Special Grades | Al6XN, Tin Bronze, Aluminium Bronze, Lead Bronze, Nimonic 75 / 80A / 90 |
ASME B16.47 is a standard that governs the dimensions, pressure ratings, and tolerances for large diameter steel flanges ranging from 26″ to 60″ nominal bore (DN650–DN1500). It is primarily used in industries where high flow capacity, strength, and sealing reliability are critical.
Key reasons ASME B16.47 flanges are used:
This standard ensures that large-diameter connections remain leak-proof, durable, and interchangeable across international projects.
The main difference between ASME B16.47 Series A and Series B flanges lies in their design dimensions, bolt patterns, and load capacity, even though both cover sizes from 26″ to 60″ and are used for similar applications.
Parameter | Series A | Series B |
---|---|---|
Bolt Circle Diameter (BCD) | Wider bolt circle for enhanced strength | Smaller bolt circle for compact design |
Flange Thickness | Thicker and heavier flange design | Thinner and lighter flange construction |
Bolt Hole Configuration | Fewer bolts with larger diameter | More bolts with smaller diameter |
Load Capacity | Higher mechanical strength and rigidity | Sufficient strength with reduced weight |
Applications | Used in critical services like offshore, refining, and petrochemicals | Used in process piping where economy and space are key |
Compatibility | Newer industry standard with higher performance | Maintains compatibility with older API 605 systems |
Engineers often choose Series A for higher mechanical strength, while Series B is selected for cost-effectiveness and compatibility with older systems.
Selecting between ASME B16.47 Series A and Series B flanges depends on several technical and project-specific factors, such as space constraints, pressure requirements, system design, and legacy compatibility.
Key Factors to Consider:
Always check the design pressure, gasket type, and companion flange compatibility before making a final selection. For custom projects, consulting the project piping class or a qualified engineer is essential.
ASME B16.47 flanges are available in a range of pressure classes that determine their maximum allowable pressure under different temperature conditions. These ratings are defined by ASME standards and are critical when selecting flanges for high-performance piping systems.
Pressure Class Breakdown:
Key Points:
Always consult the ASME pressure-temperature rating tables to ensure the selected flange class meets the operational pressure at the specified service temperature.
No, ASME B16.47 flanges are not interchangeable with ASME B16.5 flanges, as they are designed for different size ranges and dimensional standards.
Key Differences:
If a pipeline or equipment has a 24″ or smaller nozzle, B16.5 flanges must be used. For anything larger, B16.47 is required. Adapters or transition flanges may be needed if connecting across standards.
The gasket selection for ASME B16.47 Series A & B flanges depends on the flange facing type, operating pressure, temperature, and media compatibility. Both Series A and Series B flanges are commonly available in Raised Face (RF) or Ring Type Joint (RTJ) facings.
Compatible Gasket Types:
Selection Notes:
Proper gasket selection ensures leak-free sealing and long-term performance in critical service applications like oil & gas, offshore, and chemical processing.
Nutech Overseas is a trusted global exporter of ASME B16.47 Series A and Series B flanges, supplying premium-quality Weld Neck and Blind flanges to customers across oil & gas, petrochemical, marine, and power sectors in more than 40 countries.
Key Export Destinations Include:
We provides custom packaging, documentation (EN 10204 3.1/3.2, PED, NACE), and logistics support to ensure seamless and timely delivery of flanges globally.