Round vacuum boxes in the MR Chemie portfolio are specially designed for leak testing of weld joints or structures where a circular or tubular geometry requires coverage around a diameter. The range consists of several fixed diameter sizes, and is suitable for situations where a circular weld field or pipe section is covered with the vacuum box method.

Key features and benefits

• Available in a range of standard diameters (Ø approx. 125 mm, 200 mm, 250 mm, 300 mm and 400 mm) for quick selection.

• Round design makes it ideal for inspecting pipes, cylindrical vessels or weld seams that are located around the entire circumference.

• Transparent inspection glass and soft sealing strip ensure good visual observation (bubbles/leaks) during vacuum testing – which is standard procedure in MR Chemie's leak testing program.

• Compatible with MR Chemie's vacuum test equipment and test procedures, so the solution fits into existing inspection setups.

Technical specifications

• Standard diameters:
  Ø ≈ 125 mm (Art. no. 596)
  Ø ≈ 200 mm (Art. no. 1036)
  Ø ≈ 250 mm (Art. no. 1395)
  Ø ≈ 300 mm (Art. no. 1913)
  Ø ≈ 400 mm (Art. no. 466)

• Used with vacuum hose and pump unit; test method recorded for leakage limitation around ~10⁻⁵ – 10⁻⁴ Pa m³/s under practical conditions for the entire system.

• Robust construction suitable for field use, and adapted for tests where only one side of the component is accessible.

Areas of application

• Inspection and leak testing of pipe sections, cylindrical vessels and containers with welds around the entire circumference.

• Ideal for areas where standard straight or corner boxes do not fit due to circular geometry.

• Maintenance and verification in industry: tanks, pipelines, sumps and welded structures with round profiles.

• Situations where tightness requirements are high (chemicals, pressure vessels, hazardous liquids) and visual vacuum box solution are used as a documented control method.