ASME SA36 Carbon Steel Exchanger Baffle Plate Internals

Yuhong Group: Precision Heat Exchanger Components – From Tubes to Complete Bundles

Yuhong Group Co., Ltd. designs and manufactures complete thermal systems – shell & tube heat exchangers, pressure vessels, and air coolers – as well as every critical internal component: heat exchanger tubes (carbon steel, stainless steel, nickel alloy, copper alloy), fin tubes, U‑tubes, tube bundles, tubesheets, baffle plates, heads, and all related accessories.

Shown in the attached photographs is one of our ASME SA36 carbon steel baffle plates – a precision‑cut component ready for assembly into a shell & tube heat exchanger tube bundle.

The baffle plate (or baffle) is a critical internal component in any shell & tube heat exchanger. While tubes carry the fluid, it is the baffles that:

• Support the tube bundle – prevent tube sagging and vibration
• Direct shell‑side fluid flow – create a cross‑flow pattern for maximum heat transfer
• Increase turbulence – enhance heat transfer coefficients
• Prevent fluid bypass – ensure all fluid passes across tubes

Based on the images, this baffle plate exhibits:

• Material: ASME SA36 (carbon steel structural plate)
• Dimensions: OD 504mm * thickness 10mm (as stamped on the part)
• Manufacturing: Precision cut (plasma or laser) with clean edges
• Identification: Heat number and project number stamped for full traceability
• Application: Built to customer drawing (project number visible)

• Precision cutting: Our baffles are cut to exact OD (504mm as shown) with smooth edges – no burrs that could damage tubes during assembly.
• Accurate tube hole drilling: Hole diameters match tube OD + clearance (typically +0.3‑0.5mm) for easy tube insertion without excessive vibration.
• Tie rod holes: Drilled to match tie rod diameter; ensure straight assembly.
• Heat number traceability: Each plate is stamped with material heat number and project number – full traceability back to the mill certificate.
• Flatness control: Baffles are leveled after cutting to ensure uniform spacing when stacked.

The baffle shown in the photograph (circular plate with tube holes) is the most common type – single‑segmental – used in the majority of shell & tube heat exchangers.

Baffle spacing (the distance between adjacent baffles) is one of the most important design decisions in a heat exchanger:

• Closer spacing: Higher heat transfer (more turbulence) but higher pressure drop. Also provides better tube support against vibration.
• Wider spacing: Lower pressure drop but reduced heat transfer. Tubes may be more prone to vibration.

Typical baffle spacing guidelines (per TEMA):

• Minimum spacing: Shell ID / 5 or 50mm (whichever is greater)
• Maximum spacing: Shell ID (for vibration control)

The baffle shown (10mm thickness, 504mm OD) is typical for a heat exchanger with shell ID in the ~500‑600mm range – a standard size for many industrial applications.

• Exactly to your drawing: We cut, drill, and finish baffles per customer specification – OD, hole pattern, and thickness as required.
• Fast turnaround: Typically 1‑2 weeks for custom baffle plates.
• Any material: Carbon steel (SA36, SA516), stainless steel (304, 316L), copper alloys (C46400, C70600).
• Component‑only or full bundle: We supply just the baffles – or the complete heat exchanger tube bundle with baffles, tubes, tubesheet, and tie rods assembled.
• Full traceability: Each baffle is stamped with heat number and project number for complete material traceability.
• ASME compliance: All materials meet ASME Section II requirements.

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

• Original baffle drawing – best option. We duplicate OD, hole pattern, and thickness exactly.
• Old baffle (physical sample) – we can measure and replicate.
• Heat exchanger data sheet – shell ID, tube OD, tube pitch, baffle spacing.

Common errors to avoid when ordering baffle plates:

• Incorrect hole diameter – too small and tubes won’t fit; too large and tubes vibrate excessively.
• Wrong number of holes – must match tube count exactly.
• Incorrect OD – must fit inside shell with proper clearance (typically 3‑6mm smaller than shell ID).
• Missing heat number stamping – required for ASME traceability.

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

• Heat exchanger tubes – carbon steel (SA179), cut to length, end‑prepared for rolling
• Fin tubes – carbon steel or stainless steel with aluminum fins for air cooler retrofits
• Stainless Steel Seamless Tube, Nickel Alloy Tube, Copper alloy tube – available for specialized applications
• Tubesheets – drilled and grooved per your pattern
• Baffles, tie rods, spacers – machined to your dimensions
• Channel covers, gaskets, fasteners – complete spare parts packages

Every SA36 baffle plate we ship includes:

• Mill Test Certificate (MTC) per EN 10204 3.1 – chemical analysis and mechanical properties
• Dimensional inspection report – OD, thickness, hole diameters, hole pattern
• Heat number stamping – as shown on the part for full traceability
• Third‑party inspection (SGS, BV, TÜV) at buyer's request

To quote baffle plates like the ones in your photographs, send the following to jimmy@steelseamlesspipe.com:

• Drawing (PDF, scan, or hand sketch with key dimensions: OD, thickness, tube hole size & pitch, tie rod hole locations)
• Or: send us your old baffle for reverse engineering (return shipping arranged)
• Material grade: SA36 (as shown) or other (SA516, stainless, etc.)
• Quantity required (single piece or production run)

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