DLSS Heat Exchanger Tubes Finned Heat Exchanger Tubes

Finned Heat Exchanger Tubes

Finned tubes for condensers, process heat exchangers, air coolers and heat-recovery equipment.

DLSS supplies finned heat exchanger tube solutions, including integral low-finned and high-frequency welded designs, with project-specific tube materials, fin geometry, plain sections and inspection requirements.

Send your drawing for a review of the tube specification, fin construction, finished dimensions and delivery requirements.

Fin Construction

Integral Low Fin · HF Welded

Material Review

Base Tube · Fin Material

Custom Geometry

Height · Pitch · Finned Length

Inspection Support

Dimensions · Required Testing · TPI

Finned Tube Types

Fin construction should be selected together with the operating conditions, tube material, required surface area and equipment design.

Integral Low-Finned Tubes

Low-profile fins are formed directly from the tube material, creating an enhanced surface without attaching a separate fin strip.

The finished product is specified by its fin profile, remaining wall thickness, finned length and plain sections. Integral construction describes the connection between the fins and tube; the permitted base tube may be seamless or welded, depending on the product specification.

Key Parameters

Fin OD · Root Diameter · Pitch · Minimum Wall Beneath Fins

High-Frequency Welded Finned Tubes

A separate metal fin strip is wound helically around the base tube and continuously joined by high-frequency resistance welding.

The specification should identify both the tube material and fin material, together with fin dimensions, weld requirements and inspection criteria. Solid and serrated fin profiles require separate review against the project design.

Key Parameters

Tube & Fin Materials · Fin Height · Pitch · Fin-to-Tube Weld

Other Finned Tube Designs

For other fin attachments or enhanced-surface designs, submit your drawing and operating requirements for feasibility review.

Availability is confirmed against the proposed construction, material combination, dimensions and inspection requirements before quotation.

Base Tube & Fin Material Options

Material selection depends on process conditions, corrosion exposure, operating temperature and the selected fin construction.

Base Tube Materials

Selected material requirements can be reviewed against the fin geometry, tube dimensions and finished-product specification.

Fin Materials

Need Nickel Alloy or Titanium?

Submit the required grade, fin design and operating conditions for a separate review of material compatibility, forming or joining feasibility, and inspection requirements.Not every material is available in every fin construction.

Critical Finned Tube Parameters

Base Tube Dimensions

Material · Construction · OD · WT

Finned & Plain Sections

Overall Length · Finned Length · Plain Sections

Fin Dimensions

Fin OD · Root Diameter · Height · Thickness · Profile

Finished Wall Thickness

Minimum wall beneath integral fins.

Fin Pitch & Density

Pitch (mm) · Fins per Inch · Fins per Meter

Fin Attachment

Attachment Method · Acceptance Criteria · Inspection

Finned Heat Exchanger Tube Specifications

Available dimensions and material combinations are confirmed through technical review.

Specification	Project Options
Fin Construction	Integral Low Fin / HF Welded / Other Designs for Review
Materials	Base tube and fin material according to construction
Tube Dimensions	Project-specified OD and wall thickness
Fin Geometry	Fin OD, height, thickness, pitch and profile
Length & Layout	Overall length, finned sections and plain ends
Finished Condition	Wall, attachment and heat-treatment requirements as applicable
Inspection & Documents	Required tests, dimensional reports and agreed certification
Packing	Fin protection, supported bundles, cases or steel frames

Standards & Project Specifications

“Seamless and welded” in an integral-finned tube standard refers to the base-tube construction. It does not make that standard automatically applicable to separately welded fin strips.

ASTM A1012

Integral-Finned Ferritic, Austenitic & Duplex Alloy Steel Tubes

ASTM A498 / A498M

Integral-Finned Low-Carbon Steel Tubes

ASTM B359 / B359M

Integral-Enhanced Copper & Copper-Alloy Tubes

Welded Finned Tube Requirements

Base Tube Standard · Fin Material · Approved Drawing · Welding Requirements · Acceptance Criteria · Inspection Plan

Finned Tube Manufacturing & Project Control

Specification Review

Material · Fin Construction · Drawing · Inspection

Material Verification

Base Tube · Fin Strip Where Applicable · Traceability

Fin Forming or Welding

Geometry · Pitch · Finned Sections

Finished Condition

Heat Treatment · Temper · Surface Requirements

Final Inspection

Dimensions · Wall or Attachment Checks · Required Tests

Protection & Dispatch

Fin Protection · Identification · Packing

Project Documentation Support

Complete documentation for seamless approvals and traceability.

Why DLSS for Finned Heat Exchanger Tubes?

Drawing-Based Review

Fin Construction · Materials · Geometry

Finished-Product Focus

Wall Thickness · Attachment · Section Layout

Inspection Coordination

Acceptance Criteria · Reports · Traceability

Protective Packing

Fin Support · Tube-End Protection · Delivery

FAQ

What finned tube types does DLSS support?

DLSS supports integral low-finned and high-frequency welded finned tube requirements. Other configurations are subject to drawing-based feasibility review.

Can tube and fin materials be different?

For welded finned tubes, the base tube and fin strip are specified separately. Material combinations must be reviewed for compatibility and service requirements. Integral fins are formed from the parent tube material.

Can fin dimensions and plain sections be customized?

Yes. Fin dimensions, finned length, overall length and plain sections can be reviewed against the project drawing.

What inspections can be arranged?

Inspection may include material verification, dimensional checks, finished-wall or fin-attachment inspection, applicable NDE, pressure testing and third-party inspection.

What information is required for quotation?

Please provide fin construction, tube and fin materials, tube dimensions, fin geometry, length layout, quantity, inspection requirements and drawing.

Finned Tube Technical Resources

Fin Root Diameter

Understand the relationship between fin outside diameter, root diameter and the finished tube profile.

Fin Density & Pitch

Specify fin spacing and measurement units clearly.

Residual Wall After Finning

Define the finished-wall requirement for integral-finned tubes.

Finned Tube Standards

Review applicable standards by material and fin construction.