Faq

What does PEC stand for?

PEC is an acronym for Pulsed Eddy Current

What is SONOPEC?

SONOPEC is the cost effective solution for corrosion detection and monitoring of insulated components in the Oil & Gas and Energy sectors.

What type of inspection method belongs to SONOPEC?

It belongs to the Eddy Current inspection method.

What is the basic working principle of SONOPEC?

SONOPEC is based on the Pulsed Eddy Current principle (PEC).

What is Pulsed Eddy Current?

Pulsed Eddy Current is Eddy Current induced by suddenly switching of a constant magnetic field, therefore Eddy Current generated in this “transitorium”.

What is SONOPEC designed for?

It is designed for detection and monitoring of Corrosion Under Insulation (CUI).

What are the SONOPEC primary applications?

Insulated, fireproofed, coated, or encrusted vessels, columns, storage tanks, spheres, pipe, ship hulls, offshore platforms and wells.

What are the SONOPEC primary limitations?

Applicable on Carbon Steel and Low Alloyed Carbon Steel. In presence of coating and/or stainless steel weather proofing cladding nominal wall thickness 2 – 70mm, stand-off/insulation 0 – 250mm, diameters 2” up to flat plates. When the weather proofing cladding is Aluminium, then the minimal detectable Average Wall thickness is approx. 3 mm at 20ºC and it is function of the temperature. When the weather proofing cladding is Ferromagnetic, then the general equipment performances and application range are halved (WT < ~35mm, LO < ~100mm).

Can you inspect with SONOPEC non-ferrous materials?

No, at present SONOPEC is restricted to ferritic material of Carbon Steel and Low Alloyed Carbon Steel.

Can SONOPEC inspect through fireproofing, or refractories and if so is there any limitations?

Yes and the limitations are the same as the primary limitations. A ferritic steel wire mesh will not affect a reading but reinforcement rods will do, therefore a minimum of 4” mesh size or pattern is required.

What are the temperature limitations of the base object material for a SONOPEC inspection?

-100ºC to +500ºC

What types of insulation and cladding can SONOPEC inspect through?

The insulation type need to be non-magnetic and non-electrical conductive. The weather proofing cladding/sheeting can be Aluminium, Stainless Steel or Galvanised ferrous material, for this sheeting type the general performances are halved.

Is there a dead zone for a SONOPEC probe?

There is a “dead zone” which depends on the coil minimum time of each probe. How bigger the probe size, how stronger is the received signal and how larger is its coil minimum time.

What does the coil minimum time affect?

It affects the minimum detectable Average Wall Thickness (AWT).

How much coverage do SONOPEC typically have on an elbow, pipe, etc?

This is corrosion mechanism dependent and the grid size may be adjusted for straight pipe to 100% coverage depending on the corrosion characteristics. Elbow’s intrados area is accessible by placing the PEC probe orthogonally to the flow.

Does ice have any effect on SONOPEC– cryogenic service?

Ice does not have an effect, as it does not influence the generated magnetic field.

Does SONOPEC need external power supply to be operated?

No the SONOPEC equipment is powered by Battery Packs.

Is SONOPEC intrinsically safe?

No this system is not explosion proof and may have the potential to cause a spark, if a connection or wire is broken.

Can SONOPEC tell the difference between a mechanical disturbance and an artefact of corrosion?

Yes the technician has the ability to view the raw signal or data in real time and evaluate the influence of surrounding objects.

Can SONOPEC differentiate between internal and external corrosion?

Under Laboratory condition with constant lift-off it is possible to determine whether an indication is internal or external by observing the registered signal amplitude. In field operation, insulation does not have a constant thickness and therefore it will not be possible to discriminate whether an indication is internal or external.

Does the product inside a pipe affect the SONOPEC data?

When non-magnetic and non-electrical conductive it will not affect the data.

Is SONOPEC sensitive to Stagnant vs Moving waters?

Water will not affect SONOPECO until it will not penetrate inside connectors and the probes coils.

Is the SONOPEC technology sensitive to internal and external coatings? Which ones?

The system would see an influence from any magnetic of ferrous coatings and the application would be evaluated for prior history or if further application testing would be required.

Is SONOPEC sensitive to internal lining materials?

When non-magnetic and non-electrical conductive, SONOPEC will not be sensitive to internal lining material such as: HDPE, FRP, Non-Ferrous Claddings.

Is a calibration block needed to set up the SONOPEC equipment and to perform the inspection?

No calibration block is required to perform the inspection; calibration or reference measurement is performed on the component to be tested or on a sample having the same material parameters as the object to be inspected.

Can SONOPEC detect pitting corrosion?

SONOPEC is not designed for detection of localized pitting and holes. It is designed for generalized corrosion detection. When pitting is grouped and not localized, then it may give reliable indication.

Can SONOPEC inspect welds, preferential weld corrosion?

SONOPEC is not a weld inspection tool.

Does a SONOPEC inspection need to be verified by other NDT methods to validate findings?

The principal validation method is UT. SONOPEC is a relative inspection method which compares the reference data signal with all other measurement. As result it gives and Average Wall Thickness variation in the object. During validation of the findings, the Reference location and the larger deviations should be checked on the all footprint area. To be noted that within the footprint local Wall thickness could be thinner than the given Average Wall Thickness.

What is the SONOPEC Footprint?

The footprint is the magnetized area on the inspected object. The induced Pulsed Eddy Current decay will give the Average Wall Thickness value compared to the Reference.

What is the SONOPEC equipment accuracy?

The general SONOPEC measurement accuracy is 5 % of the reference value and this will be valid when the local wall reduction will not exceed more than 50% of the reference WT and when the lift-off/insulation variations will be within 50% of the reference lift-off.

What is SONOPEC the equipment repeatability?

The general equipment repeatability deviation is ±2%

What is the SONOPEC equipment detectability?

Detectability depends on the indication and footprint size. To be detected an indication must have a surface extension of more than a third of the footprint area and the volume deviation to the reference area must be more than 10%.

Can SONOPEC detect lamination?

Lamination is not affecting the reading.

Do weather conditions effect the SONOPEC system performance?

The ambient electromagnetic field could be affected during severe storms, and therefore affect the generate magnetic field and the measurement. Although the system is well sealed it is electronic equipment and in severe weather, shelter may be required for the computer and transmitter/receiver, with further sealing requirements of the sensors even to the point of requiring SONOPEC subsea probes.

Does vibration / harmonics from rotating equipment have an effect on SONOPEC?

Yes, all moving ferritic objects within the generated magnetic field will affect the reading. Their influence depends on the received signal strength. How stronger the received signal how weaker is the influence of vibration.

What effect does the insulation and cladding have on the SONOPEC data/readings?What effect does the insulation and cladding have on the SONOPEC data/readings?

Increases in the insulation thickness and sheeting magnetic properties, enlarge the integration or magnetic footprint area.