Nipoflange Suppliers

ASME B16.5 Nipo Flange Manufacturer

Nipoflange Suppliers

ASME B16.5 Nipoflange: Dimensions | Specifications | Material Grade | Standards | About Nipo Flange | All Product Types

Nutech Overseas is a trusted manufacturer and global supplier of high-quality Nipoflanges, designed for critical piping connections where branch lines are required to be connected at a 90° angle from the run pipe. These flanges are a combination of a welding outlet (nipple) and a flange, commonly used in high-pressure and high-temperature applications across industries.

The Nipoflange simplifies the process of connecting a branch pipe to a header by integrating the functionality of a weld neck flange and a weld-o-let fitting. This results in reduced welding time, minimal misalignment, and enhanced structural integrity.

Manufactured from forged materials, our Nipoflanges comply with international standards such as ASME B16.5, and are available in raised face (RF) or ring-type joint (RTJ) designs. The flange end is typically bolted to the mating pipe flange, while the nipple end is welded directly to the branch pipe.

We offer Standard and Reducing Nipoflanges in sizes from ½″ NB to 12″ NB, and pressure ratings from Class 150 to 2500 / PN10 to PN400. These are precisely machined to ensure leak-free, strong, and compact pipe jointing solutions — making them ideal for power plants, oil & gas facilities, petrochemical refineries, offshore platforms, and pressure vessel piping.

Our Nipoflanges are available in various configurations including:

  • Standard bore and reducing bore types
  • Flat Face, Raised Face, or RTJ face finish
  • Socket weld or butt weld nipple design
  • With or without reinforcement pads depending on application

Every piece is inspected for dimensional accuracy, surface finish, and pressure capability — with optional testing and documentation per EN 10204 Type 3.1 / 3.2, NACE MR0175, and PED 2014/68/EU.

As an export-focused company, we deliver Nipoflanges tailored to engineering drawings, MTOs, and global project specifications with competitive pricing and fast turnaround — serving customers across UAE, Saudi Arabia, South Africa, Germany, USA, and Southeast Asia.

Forged Nipoflanges Manufactured as per ASME B16.5 for Class 150 to 2500 Branch Connections in High-Pressure Piping Systems.

For complete technical details, including dimensions, pressure rating classes, weight charts, sizes, tolerances, and material specifications of our ANSI B16.5 Nipo Flanges, please download the full Catalog PDF below.

Standard and Reducing Nipoflanges in Raised Face and RTJ Types for EPC, Process Plants, Offshore, and OEM Installations.

Technical Specifications of Nipoflanges

Specification Details
Type Nipoflange (Nipple + Flange combination), Available in Standard and Reducing Bore
Design Standard ASME B16.5, B16.25, MSS-SP-97 (Reference), Custom Designs Available
Size Range ½″ NB to 12″ NB (DN15 to DN300) – Custom sizes on request
Pressure Ratings Class 150, 300, 600, 900, 1500, 2500 / PN10 to PN400
Connection Type Butt Weld (BW) or Socket Weld (SW) at the nipple end, Flanged at the mating end
Face Type Raised Face (RF), Ring Type Joint (RTJ), Flat Face
Drilling Options Standard and Custom Drilled Flange Holes as per mating specifications
Surface Finish Spiral Serrated, Smooth Finish, Stock Finish (Ra 3.2 – 6.3 μm)
Testing & Inspection Hydro Test, Dimensional Check, PMI, NDT (UT, MPI), Visual Inspection
Certifications EN 10204 Type 3.1 / 3.2, NACE MR0175, ISO 9001:2015, PED 2014/68/EU, IBR (if required)
Application Industries Oil & Gas, Refining, Petrochemical, Power Generation, Water Treatment, Food & Beverage, Fire Protection Systems, Pulp & Paper, Shipbuilding, Process Piping, Pressure Vessels, HVAC, Offshore Rigs
Origin Made in India (by Nutech Overseas)
Export Network USA, Europe, and Middle East

Complete Material Grade Chart - Class 150 Nipo Flange

Material Category Nipo Flange Grades
Stainless Steel Nipoflange 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 Nipoflange ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61, UNS S31803 / S32205
Super Duplex Steel Nipoflange ASTM A182 F53 / F55 / F57 / F59 / F60 / F61, UNS S32750 / S32760
Carbon Steel Nipoflange 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 Nipoflange ASTM A182 F5 / F9 / F11 / F12 / F22 / F91, AISI 4130 / 4140
Nickel Alloy Nipoflange Nickel 200 / 201, ASTM B564
Monel Nipoflange Monel 400 (UNS N04400), Monel K500 (UNS N05500), ASTM B564
Inconel Nipoflange Inconel 600 / 601 / 625 / 690 / 718 / 783 / X750, ASTM B564
Incoloy Nipoflange Incoloy 800 / 800H / 800HT (UNS N08800), Incoloy 825 (UNS N08825), Incoloy 925, ASTM B564
Hastelloy Nipoflange Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X, ASTM B564
Alloy 20 Nipoflange Alloy 20 / 20Cb-3, Carpenter® 20, ASTM B462
254 SMO Nipoflange SMO 254 / 6Mo, UNS S31254, DIN 1.4547, ASTM A182
Copper Nickel Nipoflange Copper Nickel 90/10 (C70600), 70/30 (C71500), UNS C71640, ASTM B61 / B62 / B151 / B152
Copper Nipoflange TP1, TP2, T1, T2, C10100–C12300, C14200–C17200, C21000–C71520, including C10930, C11000, C11400, C12000, C12200, C26000, C28000, C33000, C44300, C70600, etc.
Brass Nipoflange Grades 3602, 2604, H59, H62, etc.
Aluminium Nipoflange Aluminium Grades 5052, 6061, 6063, 2017, 7075, etc.
Titanium Nipoflange 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

International Flange Standards We Manufacture & Supply

What is the difference between a Nipoflange and a Weldolet + Flange combination?

The primary difference lies in design integration, welding requirements, and space optimization:

Nipoflange:

  • A single forged piece combining a weld outlet (nipple) and a flange
  • Requires only one welding operation at the branch pipe
  • Reduces chances of misalignment between fitting and flange
  • Offers better mechanical strength due to single-body construction
  • Saves space and installation time — ideal for compact or high-stress environments

Weldolet + Flange Combination:

  • Two separate components: first a Weldolet is welded to the header, then a flange is attached to the branch
  • Requires two welds, more alignment and inspection time
  • Slightly more flexibility in sourcing but may increase field labor and risk of leak points

Nipoflanges offer superior structural reliability and reduced weld fatigue, which is why they're preferred in critical process industries, offshore installations, and nuclear or high-vibration systems.

How do you specify a Nipoflange in a piping design or MTO?

Specifying a Nipoflange correctly in a piping design, isometric drawing, or material take-off (MTO) is crucial for procurement and installation accuracy. Here’s how you typically define it:

A complete Nipoflange specification should include:

  1. Size of Branch Pipe (NB/DN): e.g., 2″ NB or DN50
  2. Pressure Class / Rating: ASME Class 150 / 300 / 600 / 900 / 1500 / 2500
  3. End Connection: Butt Weld (BW) or Socket Weld (SW)
  4. Flange Facing: Raised Face (RF), Ring Type Joint (RTJ), or Flat Face (FF)
  5. Bore Type: Standard Bore or Reducing Bore
  6. Design Standard: Typically ASME B16.5 + B16.25 (welding ends)
  7. Material Grade: E.g., ASTM A105, A182 F316L, A694 F65, etc.
  8. Drilling Pattern: As per companion flange or project requirement
  9. Special Requirements: Coating, NACE compliance, IBR marking, certification

Optional data includes item code, tag number, and weld map reference — useful for EPC contractors and large plant projects.

What are the welding methods used for installing a Nipoflange?

The welding method for a Nipoflange depends on the nipple-end design and the piping system requirements. Below are the common welding procedures:

Butt Weld Nipoflange:

  • Used when the nipple end of the Nipoflange is beveled for butt welding
  • Welded directly to the branch pipe with full penetration weld
  • Requires skilled welders and proper root gap preparation
  • Suitable for high-pressure and high-temperature applications
  • Welding procedure per ASME Section IX

Socket Weld Nipoflange:

  • Used when the flange has a socketed bore at the nipple end
  • Pipe is inserted into the socket and then fillet welded
  • Easier and faster to install than butt welds
  • Suitable for small bore, moderate-pressure systems

Additional Considerations:

  • Preheating may be required based on material (e.g., for high carbon steels)
  • Post-Weld Heat Treatment (PWHT) may be specified for critical systems
  • Weld joints must be inspected with NDT methods like UT, RT, or MPI depending on service

Always follow WPS (Welding Procedure Specification) and project-specific codes for installation to ensure leak-free, high-integrity connections.

Can Nipoflanges be customized as per non-standard dimensions or project specifications?

Yes, Nipoflanges can be fully customized based on specific project needs, especially for systems where standard sizes, facing types, or connection details don't apply.

Common customization options include:

  1. Non-standard branch sizes (e.g., 1½″ branch on 4″ header)
  2. Custom pressure ratings beyond ASME classes (as per client requirement)
  3. Modified flange drilling patterns to match legacy equipment
  4. Unusual face finishes: like tongue & groove, smooth, or serrated faces with specific Ra
  5. Extended hub or nipple lengths for insulation clearance or space constraints
  6. Special coatings (epoxy, PTFE, hot-dip galvanized, etc.)
  7. High-alloy or dissimilar material combinations

These customizations are common in industries such as offshore oil rigs, FPSOs, refineries, shipbuilding, and nuclear systems, where standard fittings won’t suffice.

We offers precision machining services and in-house QA/QC support to manufacture Nipoflanges exactly as per your drawings, datasheets, or 3D models.

Which countries does Nutech Overseas export Nipoflanges to?

Nutech Overseas is a reputed global exporter of Nipoflanges, catering to industrial clients, EPC contractors, and OEMs in over 20 countries. Our flanges are trusted for their dimensional precision, material integrity, and compliance with international standards like ASME B16.5, EN 10204, and PED.

Key export destinations include:

  • Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain
  • Europe: Germany, Spain, Italy, Netherlands, Turkey
  • Africa: South Africa, Egypt
  • Asia-Pacific: Malaysia, Singapore, Vietnam, Philippines
  • South Asia: Bangladesh, Sri Lanka
  • North America: United States (USA)

All Nipoflanges are shipped with full traceability documents, 3.1 / 3.2 certificates, and project-compliant packaging, ensuring smooth customs clearance and hassle-free installation.

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