DELLOK Spiral Evaporator Carbon Steel SA210 U Bend Tube - 19mm OD, 18m Length for Heat Recovery Systems

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Delivery Time: Ex-work within 1 month on recepit of order.

Brand: DELLOK

Product Description

Product Overview

High Frequency Resistance Welded Helical Steel Fin Tubes designed for efficient waste heat recovery from boiler flue gas. These spiral evaporator tubes feature continuous spiral welding of fins onto polished bare tubes using advanced high-frequency resistance welding technology.

Technical Specifications

Core Tube Details

Tube Outer Diameter: 19mm minimum
Tube Length: 18 meters maximum
Fin Height: 32mm maximum
Fin Thickness: 0.8mm minimum
Fin Pitch: 4mm minimum for solid fins, 3.3mm minimum for serrated fins

Material Options

Component	Available Materials	Popular ASTM Standards
Core Tube	Carbon Steel, Alloy Steel, Heat Resistant Steel, Stainless Steel	SA210 Gr. C SMLS, SA106B/C, TP304/304L/304H, TP316/316L, T11, T22, T91
Fins	Carbon Steel, Alloy Steel, Heat Resistant Steel, Stainless Steel	Q235-BF, 08F, 08AL, TP304/304L, TP316/316L, TP321/321L

Production Capacity & Fin Types

Daily Production Capacity: Up to 40 tons
HFW Fin Types: Solid plain and serrated configurations
Bending Options: U-bend (hairpin) tubes available with middle or end finning

Quality Assurance

Inspection Procedures

Visual Inspection: Un-welded fin parts, fin damage, copper pollution, tears, wrap
Dimensional Verification: Fin height, spacing, inclination, corrugation, length measurements
Bending Quality: Ovality, thickness, and area reduction analysis

Documentation & Certification

Quality Assurance Plan (QAP)
Welding Procedure Specification (WPS)
Procedure Qualification Record (PQR) & Welder Performance Qualification (WPQ)
Raw material mill certificates
Inspection and test sample results
Manufacturer warranty certificate

Competitive Advantages

Production Scale: 10,000+ square meter workshop with 4 ERW high-frequency welding fining lines
Quality Control: Comprehensive raw material control, in-process monitoring, and final inspection protocols
Heat Transfer Efficiency: 8-9 times higher heat transfer ratio compared to plain tubes
Temperature Resistance: Stainless steel fins withstand up to 800°C; low carbon steel fins handle up to 475°C
Integral Construction: Eliminates heat contact resistance and thermal losses

Applications

Ideal for fired heaters, heat exchangers, boilers, economizers, pre-heaters, coolers, heat pipes, and various industrial heating systems requiring efficient waste heat recovery.

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