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  • Services
    • Engineering Services >
      • Pressure Vessel Design
      • Vacuum Chamber Design
      • Custom 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
  • Markets Served
    • Customers / Industries >
      • Quantum Technology
      • Energy 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
    • Subscribe to Our Newsletter
    • Newsletter Archive
    • Articles >
      • Custom Fabrication General Interest
      • Custom Cryogenic Technology
      • Custom Vacuum Chambers
      • Custom Pressure Vessels
  • About
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    • Why Us?
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Call: 708-425-9080

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Hydrostatic Pressure Vessel Testing

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Hydrostatic pressure testing of an industrial  process chamber
Hydrostatic pressure testing is performed by sealing off a pressure vessel except for a single-entry port. Deionized water is poured into the chamber until it is full. The chamber is oriented to eliminate trapped air inside the vessel. A hydraulic pump cart is then attached to the vessel to bring it up to a predetermined test pressure. The pressure is held for a predetermined amount of time to ensure no leaks around the welds or ports on the vessel.  

The hydraulic pressure test is inherently safer than an pneumatic test in that a failure in hydro-static pressure testing would mean a few drips on the floor.  A failure in hydrostatic pressure testing would result in a few drips on the floor, whereas a failure in a pneumatic test could lead to a catastrophic explosion. However, there are instances where a pneumatic test is preferred or required, as exposure to the hydraulic fluid could compromise the chamber's quality requirements.

The minimum required test pressure for a hydrostatic test is:

Minimum Pneumatic Test Pressure = 1.3 x MAWP x LSR
- MAWP = Maximum Allowable Working Pressure
- LSR = Smallest ratio of the allowable stress at test temperature to the allowable stress at the design temperature of the materials used in the vessel construction.

Once the hydrostatic test is complete, the vessel is drained and disassembled for thorough cleaning.  The vessel is then reassembled and packaged for shipment.

Custom Carbon Steel
Process Vessel Hydro-Static Pressure Testing

Filling a custom pressure vessel with de-ionized water in preparation for a hydrostatic test.

Custom Hastelloy
Process Chamber Hydrostatic Pressure Testing

Hydrostatic pressure testing of a Hastelloy pressure chamber.

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