ASME SA336 F11 CL2 Forged Tube Side Flange

ASME SA336 F11 CL2 Chrome-Moly Tube Side Flange | OD 597mm * ID 381mm * THK 110mm – Forged Heat Exchanger Flange for High-Temperature & High-Pressure Service

Need a custom quote for Forged Heat Exchanger Flange? Contact our engineering team directly: jimmy@steelseamlesspipe.com

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

Yuhong Group Co., Ltd. designs and manufactures a comprehensive range of thermal equipment for global industries. Our core offerings include shell and tube heat exchangers, pressure vessels, air coolers, and a complete supply of critical components: finned tube bundles, U-tube bundles, heat exchanger tubesheets, and all related parts – including forged flanges for pressure-containing connections. Our full-service approach ensures you get exactly what you need for new projects or maintenance.

Shown in the attached photographs is one of our ASME SA336 F11 CL2 chrome-moly tube side flanges – a forged component precision-machined for high-temperature and high-pressure heat exchanger service.

Product Focus: Tube Side Flange – The Critical Connection for Tube-Side Fluid

The tube side flange is a critical pressure-retaining component that connects the channel (bonnet) to the shell or tubesheet, allowing tube-side fluid to enter and exit the heat exchanger. It provides the bolted connection that enables access to the tube bundle for inspection, cleaning, and maintenance.

Based on the images, this flange exhibits:

• Material: ASME SA336 F11 Class 2 (chrome-moly alloy steel)
• Type: Tube side flange (管侧法兰)
• Dimensions: OD 597mm * ID 381mm * THK 110mm (as stamped on the part)
• Manufacturing method: Forged (dense grain structure, no internal porosity)
• Machining: Precision-machined face with bolt holes for stud bolts and gasket seating
• Marking: Full traceability with material grade, dimensions, heat number, and project number

• Forged, not cast: Forging eliminates internal porosity and provides superior mechanical properties – essential for high-pressure containment.
• Precision machining: The sealing face is machined to the required surface finish (typically 125-250 RMS for spiral-wound gaskets, or smoother for RTJ).
• Bolt hole accuracy: Bolt holes are drilled on exact pitch circle – ensures proper bolt alignment during assembly.
• Full traceability: Each flange is stamped with material grade, dimensions, heat number, and project number (as shown in your photographs).
• High-temperature capability: Suitable for continuous service up to approximately 550°C (depending on pressure).
• Hydrogen service: F11 is widely specified for hydrogen-containing streams in refineries and petrochemical plants.

The flange shown in your photograph is a tube side flange – it connects the channel (bonnet) to the shell or tubesheet, providing the entry/exit point for tube-side fluid.

When to specify F11 CL2 for tube side flanges:

• Operating temperature >400°C
• Operating pressure >50 bar
• Service involves hydrogen, steam, or high-temperature hydrocarbons
• ASME Code compliance required
• Carbon steel is inadequate due to creep or hydrogen attack concerns

• Exactly to your drawing: We machine forged blanks to your specification – OD, ID, thickness, bolt circle, and facing type.
• Fast turnaround: Forged blanks in common sizes are available; machining typically 1-3 weeks.
• Any material: Chrome-moly (F11, F22, F5, F91), carbon steel (SA105, SA350 LF2), stainless steel (F304, F316L), nickel alloys.
• Component-only or complete assembly: We supply just the flange – or the complete shell and tube heat exchanger with all associated components.
• Full documentation: Material test certificate (MTC) per EN 10204 3.1, dimensional report, PMI test report (optional).

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

1. Original flange drawing – best option. We duplicate OD, ID, thickness, bolt circle, and facing exactly.
2. Old flange (physical sample) – we can measure and replicate.
3. Exchanger data sheet – pressure rating, gasket type, bolt size and quantity, operating temperature.

Common errors to avoid when ordering tube side flanges:

• Incorrect OD / ID – must match the channel and shell/tubesheet dimensions.
• Wrong facing type – RF, RTJ, or FF – must match the gasket.
• Missing heat number stamping – required for ASME traceability.
• Incorrect material grade – F11 CL2 vs. F11 CL1 vs. F22 – verify service temperature and pressure.
• Wrong bolt hole size – bolts must fit properly for reliable sealing.

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

• Heat exchanger tubes – chrome-moly (F11/F22), stainless steel, carbon steel – cut to length, end-prepared for rolling or welding
• Finned tube bundles – for air cooler retrofits and gas-cooling applications
• U-tube bundles – complete with tubesheet, baffles, and tie rods
• Heat exchanger tubesheet – drilled and grooved per your pattern
• Baffles, tie rods, spacers – machined to your dimensions
• Flanges – SA105, SA350 LF2, F11, F22, F304, F316L – any facing type

Every F11 tube side flange 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, facing dimensions
• Heat number stamping – as shown on the part for full 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 tube side flange 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, bolt hole size and quantity, facing type)
• Or: send us your old flange for reverse engineering (return shipping arranged)
• Material grade: F11 CL2 (as shown) or other
• 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.