Spiral fin tube lengths in the welded fin workshop

Solution

Boiler and Heat Recovery Surface

Economizer surface is chosen by what the flue gas carries, not by what the duty calculation alone suggests. Four geometries cover the range from clean gas to slagging furnace duty.

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Process

From Enquiry to Delivery

Seven steps, each with a decision that belongs to it. Nothing is left to be discovered at assembly.

Gas analysisFlue gas temperature, dust loading and ash characteristics are reviewed first.

Geometry selectionSpiral for clean gas, H or HH for ash-laden economizer duty, studs for slagging sections, longitudinal where pressure drop rules.

Fin pitch settingPitch is opened or closed against fouling risk, then checked against gas side pressure drop.

Pressure part reviewWhere the finned tube is a pressure part, base tube wall and material certification are fixed accordingly.

WeldingFins are welded continuously or stud by stud on the matching line.

Weld and dimensional inspectionFin root welds, pitch and straightness are verified before bank assembly.

DeliveryTubes are straightened, marked and packed for bank assembly on site or in the fabricator's shop.

Products Involved

What This Solution Uses

Spiral welded fin tube with the steel fin welded along a helix

Spiral Fin Tube Continuously welded helical fin for boiler, economizer and flue gas duty Base tube diameter: 15 mm - 70 mm · Base tube wall thickness: 2.0 mm - 15.0 mm

H type fin tube with square fins welded on in halves, leaving the ash lane

H/HH Fin Tube Split square fins welded in pairs, leaving a straight ash lane along the tube Base tube diameter: 25 mm - 73 mm · Base tube wall thickness: 3.0 mm - 6.0 mm

Stud fin tube with individually welded studs across the tube surface

Stud Fin Tube Individually welded studs for the dirtiest furnace and process heater duty Base tube diameter: 38 mm - 273 mm · Base tube wall thickness: 3.5 mm - 10.0 mm

Longitudinal fin tube sample with straight fins welded along the tube axis

Longitudinal Fin Tube Straight fins welded along the tube axis for viscous fluids and low velocity gas Base tube diameter: 12 mm - 273 mm · Base tube wall thickness: 2.11 mm - 25.4 mm

Capability Behind It

What Sits Behind the Promise

25 rolling and cold drawing machines in the seamless tube workshop
23 fin machines and lines across eight fin geometries
Tubesheets machined to 5000 mm outside diameter and 750 mm thickness
Hydro, eddy current, mechanical, chemical and dimensional testing in house
ISO 9001:2015, CE certificate, Production licence for pressure pipe

Spiral finned tubes prepared for bank assembly — Spiral welded fin tube produced for economizer and waste heat banks.

FAQ

Boiler and Heat Recovery Surface Questions

How is fin pitch decided?

From flue gas dust loading first, then checked against gas side pressure drop. Duty fixes fin height and bank depth afterwards.

Which geometry for a biomass boiler economizer?

H or HH type, towards the open end of the 9.0 mm to 30.0 mm fin pitch range.

Can fin and tube be different materials?

Yes - carbon steel, stainless steel or alloy steel fin on stainless, carbon, alloy or nickel base tube.

Do you supply pressure part tubes?

Base tube wall and certification are specified for pressure part duty when you state that requirement at enquiry stage.

Start With the Drawing

Send the bundle drawing, the process data or the tube schedule. The first thing you get back is a list of what is missing, not an invoice.

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