ASME SA516 Gr.70 Carbon Steel Shell Flange Ring with OD ~1939mm × ID ~1568mm × THK 97mm and Precision Bolt Holes for Heat Exchangers

Yuhong Group: Complete Heat Exchanger Components – From Tubes to Flanges

Yuhong Group Co., Ltd. supplies complete thermal systems – shell & tube heat exchangers (TEMA heat exchanger designs), pressure vessels, and air coolers – as well as every critical internal and external component: Fin Tube, Furnace Tube, Heat Exchanger Tube, Stainless Steel Seamless Tube, Nickel Alloy Tube, Copper alloy tube, heat exchanger tubesheet, heat exchanger tube bundle, and large‑diameter flanges and rings.

Shown in the attached photographs and drawings is one of our large‑diameter carbon steel shell flange rings – a forged/rolled ring designed to be welded to the heat exchanger shell, providing the bolted connection for the channel or cover.

The shell flange ring is a pressure‑retaining component welded to the end of a heat exchanger shell. It provides the bolted flange connection that allows the channel (bonnet) or cover to be attached, sealed, and removed for tube‑side inspection and maintenance.

Based on the images and drawing, this flange ring exhibits:

• Material: Carbon steel (ASME SA516 Gr.70 or equivalent – typical for shell construction)

• Type: Shell flange ring (壳体法兰环) – welded to shell

• Dimensions (from drawing):

  • OD: ~1939mm

  • ID: ~1563‑1592mm (machined)

  • Thickness: ~97mm

  • Bolt circle diameter (B.C.D): 1860mm / 1887.5mm (dual pattern)

  • Bolt holes: 44‑3/4″‑UNC

• Manufacturing method: Forged or rolled ring

• Machining: Precision‑drilled bolt holes with machined sealing face

• Marking: YUHONG GROUP identification, drawing number, and project number

• Forged/rolled construction: The ring is formed from a forged or rolled plate blank – no weld seams in the flange ring itself, ensuring uniform mechanical properties.

• Precision machining: The sealing face is machined to the required surface finish for gasket sealing (typically 125‑250 RMS for spiral‑wound gaskets).

• Accurate bolt holes: Bolt holes are drilled on exact pitch circle (B.C.D. 1860/1887.5mm) with proper bolt hole diameter (44‑3/4″ UNC threads).

• Heat number traceability: Each ring is stamped with material heat number and project number for full traceability.

• Large diameter capability: We manufacture flange rings up to 2500mm OD – suitable for large heat exchangers and pressure vessels.

• ASME compliance: Materials meet ASME Section II requirements; complete exchangers can be U‑Stamped.

The shell flange ring shown is the most common construction for large‑diameter heat exchangers (OD > 1000mm), as it balances cost, availability, and performance.

The sealing face of a flange ring is critical for leak‑tight operation. The facing type must match the gasket and service conditions:

The flange ring shown in your drawing (with a machined face and bolt holes) is typically an RF (Raised Face) or FF (Flat Face) design – the most common types for large heat exchanger shells.

• Exactly to your drawing: We machine flange rings to your specified OD, ID, thickness, bolt hole pattern, and facing type.

• Fast turnaround: Forged/rolled blanks in common sizes are available; machining typically 2‑4 weeks for large diameters.

• Any material: Carbon steel (SA516, SA105), chrome‑moly (F11, F22, F5), stainless steel (F304, F316L), nickel alloys.

• Component‑only or complete assembly: We supply just the flange ring – or the complete shell assembly – or the full heat exchanger tube bundle with shell, channel, and all internals.

• Full documentation: Material test certificate (MTC), dimensional report, PMI test report (optional), and NDE reports.

If you need just parts (not a full exchanger), we supply:

• Heat exchanger tubes – carbon steel (SA179), stainless steel, nickel alloy, copper alloy – cut to length, end‑prepared

• Fin tubes – for air cooler retrofits and gas‑cooling applications

• Stainless Steel Seamless Tube, Nickel Alloy Tube, Copper alloy tube – available for specialized services

• Tubesheets – drilled and grooved per your pattern

• Baffles, tie rods, spacers – machined to your dimensions

• Flanges & flange rings – SA105, SA350 LF2, F11, F22, F304, F316L – any facing type, up to 2500mm OD

To avoid mismatches, we need the following information (send any of these):

1. Original flange ring drawing – best option. We duplicate OD, ID, thickness, bolt circle, and facing exactly.

2. Shell OD and wall thickness – to ensure correct fit‑up.

3. Gasket type – to machine the correct facing.

4. Service conditions – temperature and pressure – to confirm material selection.

• Incorrect OD / ID – must match the shell and channel dimensions.

• Wrong bolt circle diameter – bolts will not align with the mating channel flange.

• Incorrect bolt hole size – too small and bolts won't fit; too large and nut seating is compromised.

• Wrong facing type – RF vs. RTJ vs. FF – must match the gasket.

• Missing heat number stamping – required for ASME traceability.

Every large‑diameter flange ring we ship includes:

• Mill Test Certificate (MTC) per EN 10204 3.1 – chemical analysis and mechanical properties

• Dimensional inspection report – OD, ID, thickness, bolt circle, bolt holes, facing dimensions

• Heat number stamping – for full material traceability

• PMI (Positive Material Identification) – available on request

• NDE – UT, MT, or PT as required

• Third‑party inspection (SGS, BV, TÜV) at buyer's request

To quote a large‑diameter flange ring like the one in your photographs, send the following to jimmy@steelseamlesspipe.com:

• Drawing (PDF, scan, or hand sketch with key dimensions: OD, ID, thickness, bolt circle diameter, bolt hole size and quantity, facing type)

• Or: we can work from your existing equipment data

• Material grade: Carbon steel (SA516 Gr.70 / SA105) or other (F11, F22, stainless, etc.)

• Facing type: RF, RTJ, FF, or T&G

• Quantity required (single piece or production run)

We will respond with a dimensional drawing for approval, price, and delivery schedule – typically within 48 hours.