The Proof Ring test system is the most widely used equipment for evaluating sulfide stress cracking and stress corrosion cracking behaviors of materials. The compact size, accuracy, and ease of use provides an economical means for testing multiple specimens simultaneously in a fume hood. Cortest Proof Rings were our original product in 1977 – they meet the testing requirements of NACE TM 0177 test method which is used to determine materials that meet the NACE material requirement of MR 0175.

Proof Rings are precision machined from a single piece of alloy steel, and are then individually tested to obtain the relationship between load and ring deflection. Each ring is supplied with a unique test report, and is accurate to within 1% at full load. From ambient conditions to high pressure and high temperature, multiple types of vessels can be used with these proof rings to fulfill the requirements of even the most demanding application.

Proof Rings

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  • TEST METHOD

    NACE TMO177

    (Method A)

    LOAD RANGES

    75,000 – 250,000 PSI

    (75-250 KSI) 

    TESTING CONDITIONS

    AMBIENT TO HPHT

    (Custom Solutions Available)

  • Materials of Construction:

       -Epoxy Coated Proprietary Alloy Steel

    Available Stress Ranges

       -0-75,000 PSI (517.2 MPa)

       -0-100,000 PSI (689.5 MPa)

       -0-150,000 PSI (1034 MPa)

       -0-200,000 PSI (1379 MPa)

       -0-250,000 PSI (1724 MPa)

    Available Vessels

       -Ambient Condition Acrylic (Standard)

       -Pyrex Glass Vessels

       -PTFE Vessels

       -High Temperature Vessels (Up to 100°C)

       -Tempressure (HPHT) Vessels (Up to 220°C at 15.2 MPa) 

    Ancillary Equipment

       –Fume Hoods for up to 80 Proof Rings

       -Environmental Control Bath

       -Proof Ring Loading Fixture

       -Exhaust Gas Neutralization Tank Assemblies

  • -Gas Flow Control Enclosures to Meter N2 and H2S

    -Multi-Channel Timer Panel to Measure and Record Time to Failure

    -Model 12.6 Temperature Control for High Temp Vessels

  • -Stress Corrosion Cracking – NACE TM0177

    -New Product Development/Testing

    -Quality Testing-High Pressure, High Temperature (HPHT) Stress Corrosion Cracking (SCC)

    -Electrochemical Studies

    -DCPD Testing – ASTM E647

    -New Product Development/Testing

    -Supercritical Steam

    –HPHT Circulating Flow Loops

    –Hydrogen Test Enclosures