ASME B16.47 Flanges

Flanges above 24 inches often pose challenges in bolt alignment, sealing reliability, or non-standard compatibility. Our ASME B16.47 Flanges offer defined bolt circle dimensions, tight face tolerances, and global spec conformity.

Standard Specification

ASME B16.47-2020 (Series A: MSS SP-44 / Series B: API 605)

Pressure Rating

Class 75 to 900 (Series A), Class 150 to 900 (Series B)

Material

Carbon Steel (A694 Gr. F42-F80), Stainless Steel (A182 F304/F316), Duplex (A182 F51/F53)

Nominal Size

26″ to 60″ (NPS 26 to NPS 60)

Flange Type

Weld Neck (WN), Blind (BL) – No slip-on/socket weld options

Product Description

Sourcing large-size flanges usually leads to mismatch in gasket selection or delayed project schedules. This range solves both by aligning with MSS SP-44, API 605, and NACE MR0175 standards with exact values up to 60-inch NPS.

Facing Type

Raised Face (RF), Ring-Type Joint (RTJ)

Dimensions

Series A: Heavier/thicker than Series B (per Table 5A/5B)

Bolt Circle Diameter

Series A: 1-3% larger than Series B at same class/size (e.g., 60″ Class 150: 66.5″ vs 65.25″)

Number & Size of Bolt Holes

Series A: More bolts (e.g., 60″ Class 150: 56 x 1½”) Series B: Fewer bolts (e.g., 60″ Class 150: 44 x 1½”)

Surface Finish

125-250 μin RA (RF), 63-125 μin RA (RTJ grooves)

Corrosion Resistance

Clad options available (CS body with SS/Alloy 625 weld overlay)

Temperature Rating

-29°C to +538°C (Series A), -46°C to +593°C (Series B)

Material Certification

NACE MR0175/ISO 15156, PED 2014/68/EU, EN 10204 3.2

Gasket Compatibility

Spiral-wound (RF), RTJ (octagonal/oval)

Coating/Plating

FBE coating, Inconel weld overlay (for sour service)

Manufacturing Method

Series A: Typically forged (A694) Series B: Forged or fabricated from plate (A516 Gr.70)

Technical Advantages

Series A flanges come thicker and with more bolts for high-stress and cyclic load pipelines. Series B supports easier handling and lower weight, suitable for utility lines and low-torque assemblies.
We pflegen face finish within 125–250 µin RA (RF) or 63–125 µin RA (RTJ), verified using calibrated stylus-type profilometers. Our weld neck and blind flanges undergo UT/MPI as per ASTM A388, and document packs include EN 10204 3.2 and NACE MR0175 compliance.

Let's Get Started

Need reliable Flanges for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Industry Applications

Offshore Platforms

Handles high-pressure sour service lines on jackets and decks with weld neck flanges in A694 F60/F65 and RTJ facing.

Petrochemical Terminals

Fits large header lines and bypass manifolds, using Class 600 flanges with reliable spiral-wound gasket seating.

Thermal Power Plants

Connects boiler feedwater and condensate recovery loops with Series B flanges offering fewer bolts for easier maintenance.

Desalination Plants

Supports main seawater intake and reject lines where duplex or super duplex material ensures corrosion strength and long life.

Gas Processing Units

Used in compressor tie-ins and pig launcher connections where bolt torque uniformity ensures better sealing in RF or RTJ types.

Pipeline Isolation Skids

Enables temporary closures or flow control using blind flanges fabricated to Class 900 with custom corrosion-resistant overlays.

Built for Long-Span Pipe Systems

Generic large flanges often cause sealing failures or torque loss due to misaligned bolt circles. We manufacture with strict tolerance on bolt hole pitch and facing flatness to reduce that risk.
This range covers both Series A and B under ASME B16.47:2020, with size coverage up to 60 inches and Class 900. Available in forged A694 or fabricated plate A516 Gr.70 with cladding, it fits pressure lines, storage headers, and sour-service tie-ins.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

Can you supply Series A and Series B flanges with the same face finish and coating options?

Yes, both Series A and B flanges can be supplied with the same surface roughness and coating on request. We pflegen RA values within 125–250 μin for RF and 63–125 μin for RTJ across both series. Coating like FBE or Inconel weld overlay can also be applied identically, depending on service conditions.

How do I decide between Series A and Series B for the same pipe size and class?

Series A offers more bolt holes and thicker flanges, suitable for higher stress or critical joints. Series B provides a lighter design with fewer bolts, reducing assembly time and weight. We help finalize based on load cycles, piping layout, or gasket type you plan to use.

Are gasket dimensions for these flanges readily available for procurement alignment?

Yes, gasket seating dimensions follow ASME B16.20 standards and match directly with our raised face or RTJ designs. We provide exact seating widths and groove depths along with the flange supply. This supports early gasket procurement and prevents mismatches during line assembly.

Do you offer dimensional and weight charts to assess handling requirements before order placement?

Yes, we provide detailed flange dimension sheets and approximate weight data for each size and class. This allows buyers to assess lifting gear, storage setup, and installation plan in advance. We also include bolt circle and bolt hole specs in the same file for fast reference.

What kind of testing and documentation is included with these large-diameter flanges?

We offer UT and MPI testing as per ASTM A388 along with heat treatment records and chemical reports. All flanges include EN 10204 3.1 or 3.2 certification, depending on the requirement. NACE, PED, and ISO 15156 compliance details are part of the standard dossier.

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LOCATIONS

Sitz

10-A, First Floor, V. V Komplex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, Indien.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti Coimbatore-641035, Tamil Nadu, Indien. ㅤ

ASME B16.47 Flanges

Standard Specification

Pressure Rating

Material

Nominal Size

Flange Type

Product Description

Facing Type

Dimensions

Bolt Circle Diameter

Number & Size of Bolt Holes

Surface Finish

Corrosion Resistance

Temperature Rating

Material Certification

Gasket Compatibility

Coating/Plating

Manufacturing Method

Technical Advantages

Let's Get Started

Industry Applications

Built for Long-Span Pipe Systems

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ASME B16.47 Flanges

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ASME B16.47 Flanges

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