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.
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.
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.
