What are the differences between spiral duct and stainless steel welded air duct in application scope?

Spiral duct vs Stainless Steel Welded Duct: Core Difference of Application Scope

The core difference between them stems from the essential difference in technology, material and performance, which directly determines the boundary of the adaptation scene. The following is a detailed comparison:

First, the core differences of basic characteristics (determine the application boundary)

form

Comparative dimension spiral duct (mainstream galvanized spiral, including stainless steel spiral) stainless steel welded air duct (304/316L).

The spiral bite of the process steel belt is integrally formed without welding, and the stainless steel plate is mainly round and cut and welded by argon arc welding, and it can be round/rectangular/special-shaped.

The main material is galvanized steel plate (accounting for 90%), and a small amount of stainless steel spiral 304 stainless steel and 316L stainless steel (corrosion resistance).

Core performance: small wind resistance, good sealing performance, quick installation, low cost, corrosion resistance, high temperature resistance, high cleanliness, high strength and customized abnormity.

Service life of galvanized spiral: 5-10 years; Stainless steel spiral: 10-15 years, 20-30 years, the extremely corrosive environment is still stable.

Cost galvanized spiral: 1; Stainless steel screw: 1.5-2 304 welding: 2.5-3; 316L welding: 3.5-4

Second, the core difference of application scope

1. According to the ventilation medium/environment

form

Spiral duct is preferred as the scene type, and stainless steel welded air ducts are preferred.

Ordinary ventilation room temperature air, ordinary dust and non-corrosive gas cost too much.

Galvanized spiral in corrosive environment will rust and puncture after 1-2 years; Stainless steel spiral is only suitable for weakly corrosive acid-base waste gas, chemical tail gas, coastal high salt fog and humid corrosive environment.

Cleanliness requires that the galvanized layer is easy to fall off and dust is easy to accumulate on the bite, which can not meet the cleanliness requirements. Food, medicine, electronic semiconductors, dust-free workshops and laboratories are clean and ventilated.

The galvanized layer falls off above 200℃ in high-temperature scene, which is not resistant to high temperature 304, resistant to 400℃ and 316L resistant to 600℃. It is suitable for high-temperature flue gas and heat treatment workshop exhaust.

High-pressure/explosion-proof bite has limited strength and is easy to leak air under high pressure; Galvanized anti-static welding has high strength, can be used for anti-static grounding, and is suitable for high-voltage ventilation and explosion-proof workshops.

2. According to the industry scene

Spiral duct core application scenario (90% general ventilation scenario)

Ordinary industrial workshop: ventilation and dust removal (ordinary dust) in workshops such as machining, hardware and storage.

Commercial buildings: central air conditioning, ventilation and fresh air systems for shopping malls, office buildings and hotels.

Public facilities: underground garage, subway, station ventilation, fire smoke exhaust.

Agriculture/aquaculture: ventilation in greenhouses and farms.

Low-cost long-distance ventilation: large area and long-distance direct air duct in the factory area, fast installation and small wind resistance.

Core application scenario of stainless steel welded air duct (special high demand scenario)

Chemical industry/environmental protection industry: acid and alkali waste gas treatment, VOCs treatment, exhaust of electroplating workshop, and corrosive gas transportation.

Food and medicine industry: GMP clean workshop ventilation, food processing workshop exhaust, drug production clean ventilation (no shedding, easy to clean)

Electronic semiconductor industry: Dust-free workshop and clean workshop are ventilated, free from dust and impurity pollution.

High-end manufacturing/laboratory: lithium battery, new energy workshop, laboratory fume hood exhaust, high-temperature heat treatment workshop exhaust.

Special environment: coastal high-salt fog workshop, explosion-proof workshop, high-temperature smoke emission, and ventilation of hospital clean area.

Complex pipeline scene: complex ventilation layout with rectangle, special shape, variable diameter and many elbows is required, and the welded air duct can be customized with any shape.

3. According to the installation/engineering requirements

Fast delivery and low-cost project: spiral duct is preferred for prefabricated production, and the on-site installation speed is 3-5 times that of welded air ducts, which is suitable for projects that are in a hurry.

High-standard, long-life project: stainless steel welded air duct is preferred, and it is life-long maintenance-free for one-time installation, which is suitable for long-term stable operation projects such as chemical plants and pharmaceutical plants.

Long-distance straight-through air duct: spiral duct has small wind resistance, which is suitable for long-distance straight-line transportation and lower energy consumption.

Complex pipelines and special-shaped air ducts: Stainless steel welded air ducts can be customized in any shape, which is suitable for scenes with limited space and complex pipelines.

Third, the intermediate state: the positioning of stainless steel spiral duct

Stainless steel spiral duct is a combination product of "spiral technology+stainless steel material", which is between the two:

Advantages: corrosion resistance compared with galvanized spiral, 30% lower cost and 3 times faster installation compared with stainless steel welded air duct.

Application scenario: weak corrosive environment, large air volume ventilation, and cost-sensitive projects, such as ordinary food workshops and slightly corrosive waste gas treatment.

Limitations: It is still a bite connection, and welded air ducts are still needed in scenes with high pressure, strong corrosion and extremely high cleanliness requirements.

Fourth, the selection summary suggestions

General ventilation, limited budget and short construction period: galvanized spiral duct is selected.

Weak corrosion, large air volume, consideration of cost and life: stainless steel spiral duct.

Strong corrosive, clean, high temperature, explosion-proof and complex pipeline: stainless steel welded air duct is selected.

Food and medicine, electronic cleaning, chemical waste gas: stainless steel welded air duct must be selected.