Spiral Stairs for Tank and Silo
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Spiral Stairs for Tank and Silo

In tank and silo systems, spiral stairs play an important role in terms of both functionality and safety. These stairs are often used to facilitate vertical access in confined spaces. Thanks to their spiral structure, they save space and also offer an aesthetic appearance.

  • STR-spi

  • Pretank

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| Product Description 

In tank and silo systems, spiral stairs play an important role in terms of both functionality and safety

These stairs are often used to facilitate vertical access in confined spaces. 

Thanks to their spiral structure, they save space and also offer an aesthetic appearance


| Product Structure

Tank and Silo Spiral Stairs

  • Material of flights, treads, stringers, rails and handrails made of 304 stainless steel.

  • Stair steps can be made of steel grating or chequered plate

  • Customized height, rungs, rungs dimensions, crosspieces and axles.

  • Left or right turn according to convenience.

  • Platforms and intermediate stringer

  • Exit and descent terminals to be chosen according to the needs indicated.

  • Prepared for intensive industrial use with resident and reinforced stainless steel finishes.

  • Stairs can be freestanding or follow the inside or outside of the silo and tank.

  • Radius, tread width and other data according to customer requirements.



| Product Features

Corrosion-Resistant Material


We use high-quality 304 stainless steel to ensure that the stairs can be used for a long time in harsh environments.

Heavy-Duty Structure 


Heavy-duty structure, made of high-quality stainless steel with good corrosion resistance, less maintenance workload and long service life.

Safe and Reliable


The two ends of the step are equipped with non-slip checked plate, safety handrails on both sides, and a kick plate at the bottom,whic can ensure the safety of users.

Modular Design


Customizable stairs are crafted to meet the specific requirements of your site, utilizing modular construction methods that facilitate seamless installation. We provide entirely customized solutions to address all your access needs, regardless of the project's scale

Customization Design


Stairs with different heights, widths and spiral angles can be designed to suit available spaces and operational requirements and adjust the budget to your economic constraints without compromising quality and long-term performance.

Wide Application


Suitable for various industrial environments, such as chemical plants, food processing plants, storage tanks, buildings, warehouses and other high-altitude channel solutions.

| Customer Cases


Tank and Silo Spiral Stairs (1)
Tank and Silo Spiral Stairs (2)




| About Company

Pretank is established in 1971, it's the largest-scale and longest-history stainless steel vessels manufacturer in China,with 4000 staff, 666,000 m㎡ floor space and US$240 million annual sales. We have the most advanced technology, R&D capability in the industry,adopt solidworks and AutoCAD to design vessels, Engaged in formulation of National Standard in designing, producing, inspection and transportation.About us

53-Year History in Tank Fabrication

Prettech stainless steel tanks already used in 40 classifications,gather rich experiences and precipitate skills in varied industries,win 100,000 client’s trust

Guarantee Quality

- Ensure no leaks no rust, easy cleaning.
- All tanks are over engineered and heavy-duty made, lengthen tank service life.
- Stainless steel tanks produced by automatic and laser machines, reduce labor fault.
- Each tank is strictly tested and inspected before delivery.
- We pass through ISO certificates CE, PED, API650, AS1210, AS1692, CSA, supply 2-year warranty.

Competitive Price

Scale production and automatic machines reduce cost, Pretank always perseus the most reasonable price policy to share the profits with our consumers and distributors. With same quality our price are more strong competitive.

Customize Service Free of Charge
Our bespoke tanks are tailor-made for each project, considering material, strength calculations, dimensions, fittings, and ports.We listen carefully to your needs and provide humane designs.

Lifetime Engineering Service

At pretank family, you will get lifetime engineering service! Installation service on your site, making all the AutoCAD drawings for you, completely free parts replacement in the warranty date, low cost parts supplied out of the warranty, technology support door to door, lifetime consult support.



| Processing Machinery

Pretank use advanced processing machines to fabricate our stainless steel tanks,including auto Robot welding machine,laser cutting/welding machine,CNC lathe,plasma cutting and automatic welding machines.

The machines replace labor working and minimize the human fault& tanks defects,improve tank quality, shorten construction period.

Processing Machinery


| Certificate


Over 100 patents including utility,invrention and industrial design.

Pass through ISO certificates of ISO9001/22000/ 45001, and other export certificates of  CE, PED, API650, AS1210, AS1692, CSA.Certification


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Provide stainless steel tanks solutions for liquid processing of STORAGE,FERMENTING, HEATING,CHILLING, BLENDING, DISTILLING, MASHING AND BOILING.

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Tel: +86-519-85255001 
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Add: A-floor, 16,R&D HUB 2,Science and education Town, No.801,Changwu Middle Road,Wujin District, Changzhou, Jiangsu. P.C. 213000
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