About Flanges
Carbon steel, stainless steel, and alloy steel flanges - weld neck, slip-on, blind, socket weld, threaded, and lap joint - conforming to ASME B16.5 and ASME B16.47 for process piping, pressure vessels, and industrial equipment.
Use this page as a product and specification reference. The exact material grade, dimensions, manufacturer, certification, inspection scope, quantity, price, availability, freight, and delivery timing are confirmed for the specific RFQ.
Specification reference
| Size Range | NPS 1/2" to 24" (ASME B16.5), NPS 26" to 60" (ASME B16.47) |
|---|---|
| Pressure Classes | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Material Grades | ASTM A105 (CS), ASTM A182 F304/F316 (SS), ASTM A182 F11/F22/F91 (alloy) |
| Face Types | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF) |
| Standards | ASME B16.5, ASME B16.47, ASME B16.36 (orifice), MSS SP-44 |
Confirm the exact grade, dimensions, tolerance, test certificate, and current availability for your requirement before ordering.
Common applications
- Oil & Gas: Pipeline flanged connections, wellhead equipment, manifolds.
- Power Generation: Boiler connections, turbine piping, feedwater systems.
- Chemical & Pharma: Reactor vessels, process piping, clean-room systems.
- Water & Infrastructure: Pump connections, valve assemblies, water treatment plants.
Source mills we work with
We procure from established Indian and global mills selected for the required grade, test certificate, and delivery schedule.
- Regal Sales Corporation
- Kanak Metal
- Tube Trading Co.
- Dynamic Forge & Fittings
Applicable standards and specifications
What to include in the RFQ
- Specify the relevant standard or grade where known.
- Provide OD or NB, wall thickness or schedule, required length, and quantity.
- State the delivery city or PIN code and any unloading constraints.
- List MTC, IBR, TPI, marking, inspection, or other documentation requirements.
Frequently asked questions
What is the difference between weld neck and slip-on flanges?
Weld neck flanges have a tapered hub that is butt-welded to the pipe, providing the strongest and most leak-resistant connection. Slip-on flanges slide over the pipe and are fillet-welded inside and outside. Weld neck flanges are preferred for high-pressure and high-temperature service. Slip-on flanges are cheaper and easier to install for lower-pressure applications.
How do I select the right flange pressure class?
The pressure class (150#, 300#, 600#, etc.) is determined by the system design pressure and temperature. Higher classes have thicker flanges and larger bolts. Your piping engineer's P&ID or line designation table will specify the required class. When in doubt, consult the ASME B16.5 pressure-temperature rating tables.
Do your flanges come with test certificates?
Yes, all flanges are supplied with Mill Test Certificates (MTC) per ASTM A105 or A182 as applicable, stating chemical composition, mechanical properties, and dimensional inspection. For IBR-regulated systems, we can supply flanges with Form III-C documentation.
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