Large-diameter flanges: B16.47, IS 6392 and to drawing
Flanges above 24 inch for blast furnace gas and air headers, cooling water mains, process ducts and vessel nozzles.
Standards and patterns
| Standard | Typical use |
|---|---|
| ASME B16.47 Series A | Heavier pattern, 26 to 60 inch, formerly MSS SP-44 |
| ASME B16.47 Series B | Compact pattern, 26 to 60 inch, formerly API 605 |
| IS 6392 | Steel plant water, gas and air lines in India |
| EN 1092-1 | European-standard equipment connections |
| AWWA C207 | Water transmission and cooling water mains |
| Client drawings | Vessel nozzles, girth flanges and non-standard rings |
How large flanges are made
Large flanges are made from forged rings or from rolled-and-welded or cut plate, depending on what the standard and your specification allow. Rings are machined, faced, drilled and checked against the drawing before dispatch. Ultrasonic testing of forgings is done when your QAP calls for it.
Heavy plate work such as blast furnace nozzles is handled by Teshi Heavy Fabrications.
Have a BOQ or drawing? Get a quotation from the manufacturer.
Send sizes, grades and quantities. Our estimation team usually replies within one working day.
Facings, marking, testing and packing
Facings
- Raised face (RF), serrated 125–250 AARH
- Flat face (FF)
- Ring-type joint (RTJ)
- Tongue and groove, male and female
Marking
Hard-stamped or stencilled with Teshi mark, size, class, grade, heat number, bore or schedule and standard, so every piece traces to its certificate.
Testing
- Dimensional and visual inspection
- PMI on alloy grades
- Hardness, impact (LF2), IGC (stainless) on request
- UT of forgings when your QAP calls for it
Packing
Faces protected, rust-preventive coating on carbon steel, packed in wooden cases or on pallets. Seaworthy packing for export orders.
Questions buyers ask
What is the difference between B16.47 Series A and Series B?
Series A flanges are heavier with fewer, larger bolts. Series B flanges are more compact with more, smaller bolts. They are not interchangeable, so the series must be on the order.
Get a quotation from the manufacturer
Send your BOQ, drawing or tender reference. You deal directly with the manufacturer.
- Reply from our estimation team, usually within one working day
- Carbon steel to titanium on one order
- EN 10204 3.1 or 3.2 certificates, third-party inspection welcome
- ISO 9001:2015 certified and IBR approved, since 1971
Drawings and BOQ spreadsheets are easiest by email. Mention your project name.