The spiral welded pipe production line of Dolco Heavy Industry is a mature unit after years of practice and improvement, which has the advantages of stable forming, high automation, low energy consumption and high production efficiency.

Product Details

The spiral welded pipe production line of Dolco Heavy Industry is a mature unit after years of practice and improvement, which has the advantages of stable forming, high automation, low energy consumption and high production efficiency.

  • Using double pendulum bridge technology, reasonable swing saves space and improves production efficiency.

  • Strict physical and chemical inspection of raw materials to ensure product quality.

  • Adopt advanced welding technology and equipment to ensure stable welding quality.

  • The weld quality is guaranteed by non-destructive testing technology such as ultrasonic and X-ray.

  • After a strict inspection system to ensure that the pipe production process qualified before the production.

  • The accessories of the unit use international well-known brands, such as the United States Lincoln welding machine, Siemens motor, etc., to ensure the stability and reliability of the equipment.

Dolco's spiral welded pipe production line can meet the needs of different industries and provide customers with high quality products and solutions.

Automatic Hydrostatic Testing Machine

Hydrostatic testing machine is mainly used for pressure test of welded pipe, with computerized recording, storing, printing and test results. It has the advantages of high efficiency, high test pressure and strong safety. Adopting two sealing forms: polyurethane end face sealing and internally braced large gap sealing.The diameter range of hydrostatic testing machine is Φ219-Φ5000mm, and the maximum test pressure is 50MPa.

Technology Flow

Feed pipe-Receive pipe-Water filling-Pressure suppression-Pressure keeping-Pressure relief-Drainage-Pipe outlet

Flat Head Chamfering Machine

The chamfering machine of spiral pipe/straight seam submerged arc pipe is used for flat head and groove processing of pipe end of spiral welded pipe or straight seam submerged arc welded pipe. Equipped with copying chamfering knife, the groove processing is uniform and beautiful.

The diameter range of chamfering machine is φ60mm-φ3100mm, it meets the standards of API-5L, API-5CL, GB9711.1 and GB9711.2.

Process flow

Upper pipe - connecting pipe - clamping - flat head chamfering - loosening fixture - outlet pipe

Use to

Spiral welded steel pipes are mainly used for transporting oil and natural gas, as well as for transporting pressure pipelines such as water and steam. They are used in petrochemical, thermal pipelines, building structures, and other engineering projects.

Technical Parameters

Technological process

About us

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Why choose us?

  • Export Experience (Global Trade)

    Since its establishment in 2002, Condor Heavy Industries has successfully operated its equipment in more than 20 countries and has dealers involved.According to Chinese export customs data, Dorco's related equipment ranks among the top ten in the industry, which means reliable quality and price.

  • Customize on demand

    With 21 years of manufacturing and export experience, Dorco supports the design and customization of equipment on demand, provides equipment configuration details and parameter guidance, and guarantees subsequent production quality and equipment adjustment. Here, you can get professional advice for your needs.

Our Clients Say

  • “Excellent plant planning, always the first time to help me solve the problem, thank you!”



    From Pakistan

  • “Excellent technology, fair price, will certainly recommend to friends”

    Albus Waugh

    Albus Waugh

    From Australia

  • DORCO has given me the exchange of industry resources, and I hope to have long-term win-win cooperation.



    From America

  • “High-quality products, gave me high-quality marketing material support, professional!”



    From Canada

Customer factory inspection communication

DORCO Factory Common inquiry

  • What information we need customers to provide?

    Dorco has R&D Center to focus on the study for new product. We can design and make the change as customer’s requirements. We keep an opened mind to service our customers.

  • What’s your quality control system?

    We operate ISO9001 Quality Management System. We control our products quality by our workshop processes: Materials incoming inspection, Machining process control, finished testing and Inspection before packing. Each step has inspector and the testing results will be recorded for checking.

  • What kind of payment terms do you accept?

    We prefer T/T through bank. 30% when order is confirmed and 70% before shipment.

    L/C is also acceptable for amount over 200,000USD.

  • What is your warranty policy?

    All our products are warranted for one full year from date of delivery against defects in materials and workmanship.This warranty does not cover parts that are worn out through the course of normal operation

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