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  • Services
    • Engineering Services >
      • Pressure Vessel Design
      • Vacuum Chamber Design
      • Cryogenic System Design
    • Machining Services >
      • CNC Milling
      • Lathe Turning
    • Welding Services >
      • ASME Code Welding
      • Aluminum Welding
      • Brazing and Soldering
      • Precision Welding Services
    • Assembly / Testing Services >
      • Helium Leak Testing
      • Pneumatic Pressure Testing
      • Hydrostatic Pressure Testing
      • Electrical Wiring / Sensor Testing
      • Cold Shock Testing
      • Precision Cleaning
      • Dye Penetrant Testing
  • Products
    • Vacuum Products >
      • Custom Vacuum Chamber >
        • Custom Aluminum Vacuum Chamber
        • Custom Stainless Steel Vacuum Chamber
        • Custom Exotic Material Vacuum Chamber
      • Custom Combination Pressure and Vacuum Chamber
    • Pressure Products >
      • Custom ASME Code Pressure Vessel
      • Non ASME Code Pressure Vessels
      • Custom ASME B31.3 Piping Systems
    • Cryogenic Products >
      • Custom Cryostats / Dewars >
        • Custom Aluminum Cryostats / Dewars
        • Custom Stainless Steel Cryostats / Dewars
      • Custom Cryogenic Distribution Boxes / Cold Boxes
      • Custom Heat Exchangers
      • Custom Cryogenic Thermal Shrouds and Shields
    • Machined Products >
      • Precision Mechanical / Electrical Assemblies
      • Custom Precision Machined Parts
      • Radio Frequency Components
    • MLI - Multi Layer Insulation
  • Experience
    • Customers / Industries >
      • Oil and Gas Industries
      • Aerospace Industry
      • Nuclear Industry
      • Coatings Industry
      • Semiconductor Industry
      • Astronomy Telescope Industry
      • Engineered Diamonds Industry
      • National Laboratories
      • Research Universities
      • Advanced Industrial Process Customers
      • CBD and Essential Oils
    • Customer Testimonials
  • Learning Center
    • Fabrication Tips
    • Newsletters >
      • Newsletter Signup
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    • Articles >
      • Custom Fabrication General Interest
      • Custom Cryogenic Technology
      • Custom Vacuum Chambers
      • Custom Pressure Vessels
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Call: 708-425-9080

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Helium Leak Testing

Vacuum Testing - Helium Spray - Bag Testing

Helium leak testing is required for all of the cryogenic equipment and vacuum vessels we build.  Final leak tests are performed once the vessel fabrication is complete.  There are also numerous intermediate leak checks performed on subassembly weldments during different stages of the production process.  In some cases, welds cannot be repaired once subassemblies are attached to the main vessel so it becomes imperative to ensure that individual welds are leak tight.  In the big picture it actually speeds up production time since it greatly reduces the amount of time required to pinpoint a leak.

Helium leak detection is performed with a self calibrated leak detector.  A vacuum of 10-6 Torr or lower is pulled on either the interior or exterior of the assembly that is being tested.   A wand is used to blow a small amount of Helium around each questionable weld zone.  If there is a leak in a weld, the Helium will be drawn into the vacuum and the detector will sound an alarm. In some cases the entire part can be enclosed in a bag filled with Helium.  The bagging process is a conservative method used to prove that no leaks are present in the vessel. 

 The leak detector will specify the leak rate that is detected.  Commonly, for cryogenic and vacuum equipment, leak rate acceptance criteria would require a system sensitivity of 1x10-9 to 1x10-8 atm.cc/sec, (mbar.l/s), for a valid leak test.

Spray Helium Leak Testing

Helium vacuum leak testing multiple Stainless Steel tubing subassemblies prior to being welded to the final chamber

Deep Space Telescope Cryostat Leak Testing

Helium vacuum leak testing of a 0.010" thick Stainless Steel tubing line complete with bimetal fittings which attach it to the Aluminum chamber

Vessel Helium Leak Testing

Pumping down a vessel in preparation for a Helium leak test

Aluminum Cryostat Helium Leak Testing

Helium spray testing the Stainless Steel tubes and Aluminum chamber of a custom Aluminum cryostat assembly

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Phone: 708-425-9080
Fax: 708-425-2612
Address: 4601 W. Southwest Highway, Oak Lawn, IL, 60453
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