Product Overview

JMG Machinery Single/Double Chamber Vacuum Calibration Tank is a critical sizing and cooling device for pipe extrusion lines, designed for thermoplastic materials such as PVC, HDPE, PPR, and PE. Fully constructed from SUS304 stainless steel, it uses stable vacuum pressure to pull the molten pipe tightly against the sizing sleeve, while an efficient spray cooling system rapidly reduces the pipe temperature. This ensures precise outer diameter accuracy and uniform wall thickness. The single-chamber model is ideal for small to medium diameters and standard line speeds; the double-chamber model allows independent vacuum and cooling control in two stages, making it particularly suitable for large-diameter or high-quality pipes. Covers pipe diameters from 16 mm up to 630 mm (expandable to 1200 mm), meeting all needs from residential pipes to municipal water supply, gas pipes, and electrical conduits.

Key Advantages

• ✅ High-precision sizing, reduce scrap rate by 30% – Stable and adjustable vacuum keeps the pipe tightly against the sizing sleeve, achieving outer diameter tolerance within ±0.2 mm and significantly improved wall thickness uniformity.

• ✅ High-efficiency spray cooling, increase line speed by 20% – Optimized fan nozzles with anti-clog design deliver uniform water mist coverage, improving heat exchange efficiency by 35% over traditional immersion cooling. Rapidly cools the pipe below its glass transition temperature, allowing higher extrusion speeds.

• ✅ VFD vacuum pump, save energy by 25%+ – Standard VFD control automatically adjusts vacuum level according to pipe diameter and line speed, avoiding continuous full-load operation. Actual data shows 25–30% annual electricity savings compared to fixed-speed pumps.

• ✅ Automatic water level control + large viewing window with LED light – Water level sensors monitor cooling water in real time and automatically add or drain water. Large tempered glass window with LED illumination allows easy observation of the sizing process inside the tank.

• ✅ Full stainless steel construction, 5-year corrosion resistance – All water-contact parts are SUS304 stainless steel (SUS316 optional), resistant to oxidation and chloride corrosion, suitable for 24/7 continuous operation, service life over 10 years.

• ✅ Easy maintenance, reduce downtime by 50% – Quick-clamp nozzle assembly, removable filter screen, and large-slope bottom drain design allow daily cleaning and nozzle replacement within 15 minutes. Vacuum lines include transparent inspection sections and drain ports.

Working Principle

After exiting the extruder die, the molten plastic pipe enters the vacuum calibration tank. The vacuum pump generates an adjustable negative pressure (0.02–0.08 MPa) inside the tank, which pulls the pipe wall tightly against the inner surface of the sizing sleeve, accurately replicating the sleeve’s dimensions and roundness. Simultaneously, multiple nozzles spray cooling water onto the pipe’s outer surface, quickly removing heat and solidifying the pipe to sufficient strength for further cooling in downstream tanks.

In the single-chamber design, vacuum and cooling occur in one chamber – compact and suitable for pipes up to 160mm. The double-chamber design uses the first chamber mainly for vacuum sizing and the second for intensive cooling, with independent vacuum adjustment for each chamber. This prevents internal stress or ovality issues that can occur when large-diameter pipes cool too quickly.

Technical Specifications

* Specifications may vary based on final configuration. Please refer to quotation.

Optional Configurations & Customization

We understand the unique requirements of different pipe extrusion lines and offer the following options:

• Digital Vacuum Controller – Real-time digital display and closed-loop PID auto-regulation, accuracy ±0.001 MPa.

• Automatic Water Level & Temperature Regulation – Temperature sensor + proportional valve maintains optimal cooling water temperature (20–30°C).

• Extra-long Chamber – Customizable up to 12 meters for oversized pipe diameters or slow cooling processes.

• Special Pipe Diameter Kits – Beyond the standard 16–630mm range, we can provide sizing sleeves and seals for 12mm, 700mm, 800mm, 1000mm, 1200mm.

• High-pressure Flushing System – Quickly flushes deposits from the tank interior, reducing cleaning downtime.

• Remote Monitoring & Alarm – Automatic alarm push to control room or mobile phone when vacuum, water level, or temperature is abnormal.

Typical Applications

• PVC Drainage / Water Supply Pipes – Building drainage, municipal sewage, agricultural irrigation.

• HDPE Water / Gas Pipes – Urban water supply networks, natural gas pipelines, trenchless pipes.

• PPR Hot & Cold Water Pipes – Residential and commercial heating, domestic hot water systems.

• PE Electrical / Telecommunication Conduits – Cable protection pipes, fiber optic ducts, silicon core pipes.

• MPP Power Jacking Pipes – Modified polypropylene cable protection pipes for trenchless installation.

Our equipment has been operating stably on more than 200 pipe production lines worldwide, serving large building materials groups, municipal engineering contractors, and export-oriented pipe factories.

Why Choose JMG Machinery?

• 15 years of extrusion auxiliary experience – Specialized in vacuum calibration tanks, spray cooling tanks, haul-offs, cutters, and other downstream pipe equipment.

• CE / ISO 9001 certified – All equipment complies with EU safety standards and quality management systems.

• Fast-response after-sales – Trouble diagnosis within 24 hours, on-site engineer dispatch within 48 hours (major domestic cities).

• Long-term spare parts supply – Even after 8 years of operation, critical spare parts (nozzles, seals, viewing windows) remain available for order.

Get a quote today: Please provide your pipe material, outer diameter range, and target line speed. We will recommend the optimal chamber configuration and provide a technical proposal with price.