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Pressure Vessel Testing
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MONPAC - ACOUSTIC EMISSION PRESSURE VESSEL TESTING

MONPAC is an Acoustic Emission based expert system for evaluating the structural integrity of metallic pressure vessels, spheres, columns and tanks. MONPAC consists of AE test procedures and evaluation criteria and enables 100% inspection of the vessel during one pressure test.
MONPAC
The MONPAC technology package is the result of a strategic cooperative development by Physical Acoustics Corporation (PAC), Software & Systems Division of MISTRAS Group, and Monsanto Chemical Company (MON). An acoustic emission "expert system" for evaluating the condition of metal pressure systems and tanks, based on experience from over 5,000 tests, MONPAC procedures are now widely used in the oil and chemical industries.

AE Sensors on Vessel
MONPAC can be applied during:
  • First Hydrotest of a new Pressure Vessel according to ASME-V Part 12
  • Requalification Hydrotest of a used Pressure Vessel
  • On-line Pressurization (in-service with working fluid)


  • The method utilizes PAC's multichannel Acoustic Emission systems and sensors that detect the high-frequency signals resulting from deterioration in the structure when subject to stress. The systems have sufficient speed and resolution to ensure real-time, on-screen indications of the development of any defects.

    MONPAC
    The signals may result from local over-stressed areas, crack growth, and/or corrosion products de-cohesion. According to evaluation criteria, developed after thousands of tests, MONPAC gives "color coding" for severity of emission and complete associated recommendations.

    MONPAC testing requires Acoustic Emission Instrument Training and Certification. Only experienced AE practitioners qualify for the MONPAC license, so the market is well identified, being limited to those companies that regularly practice the technology.
    Pressure Tank Inspection
    Benefits of the method are largely seen in the reduced inspection costs and reduced downtime resulting from improved information about plant condition. MONPAC is particularly effective on spheres and columns, and for tank shell integrity testing. It is also used on complete process systems. The method provides a "color coding" for severity of emission, complete with associated recommendations.

    KEY ADVANTAGES
  • Rapid Inspection (e.g. a 15m sphere is tested in approx. 3 days)
  • Global Monitoring (100% inspection, including welds, repairs, base metal etc...)
  • On-line Testing (can be tested with service product)
  • Minor Insulation Disturbance(insulation not removed, only few holes cut locally)
  • Reduction in Inspection costs
  • Reduction in downtime resulting from improved information about plant condition
  • The AE test is performed in accordance with ASME-Section V, Article 12
  • MONPAC
    For more information on our MONPAC Technology Package, please click any of the links below.

    View and Download our MONPAC Brochure.
    View our MONPAC Training Courses
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