The technique:

Either for safety or performance improvement, it is extremely important to have good predictive maintenance strategies towards control valves. With Valve Analysis it is possible to monitor each aspect of its performance, and then provide a diagnostic.

The data acquisition occurs mainly in the field, with a portable system, which is prepared to dynamically drive the valve. The test can take from 10 to 20 minutes per valve, a little more or less depending on the case. More complex testing may demand more time. The valve must be in bypass mode during testing, either manually or automatically.

Mainly primary faults that can be detect are faulty diaphragm; leakage; wear (on many parts); looseness; bending shaft etc.

Dynamic parameters that can be evaluated:

  • Travel;
  • Spring travel;
  • Spring compression;
  • Seat conditions;
  • Friction;
  • I/P calibration;
  • Positioner calibration;
  • Linearity;
  • Dynamic Error;
  • Hysteresis;
  • Overall performance;
  • Repeatability;


Turbomachinery is usually one of the most critical type of machine in an industrial plant. Generally of high power and rotating speed, these machines represent great responsibility within the process and its health is top priority. Analyzing and controlling the proper operation of this type of equipment demands senior expertise and specific technology, compatible with its manufacturing complexity and operational dynamics.


Many of these type of machines are loaded with protection systems that work mostly with vibration control. This control is generally limited to alarms of overall value, and not capable of performing a full diagnostic of the vibration spectrum that the machine provides. For a comprehensive understanding of the machine’s health, a proper diagnostic technique must done, thus having possible failures and flaws detected prior to any break.

Orbit Analysis

turbomachines are generally of high rotating speed, high potency and low clearance among parts; thus maintaining proper geometric stability is very important for smooth and safe operation. In order for this to be checked and controlled, proximity probes are installed on the supports in all directions. The probes can be set up in a number of different ways, providing great information about displacement of external set or internal parts, depending on how they are set up. Meaning precise information about the dynamic stability of the system.

Finite Element Analysis for Dynamic Operation

Finite Element Analysis takes precise project data and operational conditions into the computer, making it is possible to simulate any solutions prior to applying them, prioritizing safety and efficiency of solutions.

Dynamic Analysis by Mechanical Thermal Imaging

Thermal Imaging identifies any abnormally hot spots under dynamic condition, making it possible to locate and correct unwanted loads.

Advanced Online and Offline Vibration Analysis

senior vibration analysis, using both online and offline systems for a comprehensive understanding of vibration pattern.

Static and Dynamic Resonance Test

identification of resonance frequencies, which are crucial to understanding vibration related problems

Analysis of Magnetic Sources

current spectrum for various operational conditions; precise analysis to identify the contribution of magnetic defects that might be affecting overall system performance.

One of the most important Predictive Maintenance practices. Oil analysis (OA) is the laboratory analysis of a lubricant's properties, suspended contaminants, and wear debris. OA is performed during routine predictive maintenance to provide meaningful and accurate information on lubricant and machine condition. Engefaz follows a number of different standard norms to make sure diagnostics are extremely accurate, such as ASTM D88; ISO 4406/99; ASTM D377; ASTM D92; among others.

EGF’s headquarters also holds in its Technology Center a Remote Analysis Team, which studies vibration data sent from any place in the world. Engefaz has developed its data acquisition system to work with WEB, so this data can be analyzed anywhere, once it is uploaded.

Even on remote clients, Engefaz is able to take care of standardization of technical field data, necessary to analysis, hence ensuring full reliability of diagnostic. This system also makes possible to easily access a full monitoring history trend of any equipment.

Remote Analysis is specifically interesting for clients who seek high-end vibration analysis partners but using their own resources for data acquisition.

Ultrasonic testing is one of the most reliable non-destructive testing techniques in Predictive Maintenance. It is based on the propagation of ultrasonic waves in the object or material tested. UT is most commonly used on steel, metals and alloys in general, but can also perform on concrete, wood and composites.

In most common UT applications, very short ultrasonic pulse-waves with center frequencies ranging from 0.1-15 MHz, and occasionally up to 50 MHz, are transmitted into materials to detect internal flaws or to characterize materials. A common example is ultrasonic thickness measurement, which tests the thickness of the test object, for example, to monitor pipework corrosion