Pile Testing

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CHUM – 3D animation movie

CHUM – 3D animation movie

A new animated movie introducing the CHUM just added to our YouTube channel

We think it is an effective and very clear way to show the product

More about CHUM in the product page

Posted by admin in CHUM, Crosshole Ultrasonic Logging, Pile Testing, 0 comments

Pile P20 – A Case History


Pile P20 – A Case History

supported by 3D tomography and verified by coring

Erez I Amir. Piletest



Pile P20 is part of a sensitive project so just a few details can be disclosed at this stage.

The pile is ACIP (augered-cast-in-place) 1m diameter and 14m long

The pile was pre-installed with 4 CSL access tubes and was tested more than 5 days after casting.

CSL Test Results

CSL (Cross-Hole Logging) was performed using CHUM (Cross Hole Ultrasonic Monitor) manufactured piletest.com

Testing revealed a significant relative energy (RE) decrease and a matching first arrival time (FAT) increase in profiles 13 and 23, and to a lesser degree also in profile 12 (Images 1, 2)

CSL results – showing an anomaly at all profiles at the same level

Image 2

A zoom into the anomaly zone, profile 23.

The bars on the left indicate that at 10m both FAT is increased by > 20% and RE decreased by > 12dB


Although the data was tested by 1D CSL and the pile was equipped with just 3 access tubes, a 3D tomography was attempted and reveals the location of the flaw (image 3)

Image 3

A 3D tomography view of the anomaly at 10m, showing velocities lower than 2750m/Sec, higher velocities are transparent



Following the CSL results, the inspector ordered coring of the pile which confirmed the CSL results (Image 4) – The concrete at 10m was totally washed-out leaving just aggregates.

Image 4

Cores showing the defect



  1. CSL is a viable test method with few false-positives
  2. Interpretation is usually straightforward
  3. 3D tomography supports tough decisions regarding anomalies.



As this project is undergoing litigations, we thank the anonymous testing lab for sharing this information with us.


Posted by admin in CHUM, Crosshole Ultrasonic Logging, Pile Testing, 0 comments
CHUM CSL Picture in Bangladesh.

CHUM CSL Picture in Bangladesh.

We liked this surreal and colorful picture showing CHUM CSL testing so much we just had to share it with you 🙂

By the way – just by looking at the size of the cable heap you can guess how massive this pile is…

— Picture credit to MD. SHAMSUL ISLAM from Prosoil, Bangladesh


Posted by admin in CHUM, Crosshole Ultrasonic Logging, Pile Testing, 1 comment

BIT – Measuring verticality in CSL access tubes

Every standard specifies the permitted deviation from the vertical – and for a good reason.
But until now, there was not practical way to measure it
The new YouTube animations below explains it perfectly

Contact us for details

Posted by admin in Inclination Testing, Pile Testing, 0 comments

You are probably spending too much time on your testing!

You are probably spending way too much time on your testing!
Why is this happening?
And what am I doing wrong?
Read the following article to find out!

“My boss did not believe how fast I tested this 100-pile retaining wall”

He figured it would take me 2-3 minutes per pile which is over 3-5 hours, but I finished in half that time thanks to the following PET features:


I first used [Pile]-[Insert multiple piles] – it is a bulk-insert feature. When I need to test a long series of piles this feature saves me repetitive and tedious typing. This feature can be accessed from the Pile tab on the top menu. I can even define complex pile-name series.

My tip: if the series isn’t continuous (for example, 1..5, 10..15, 20..25, … .90..95) – I simply fill the whole range (1-95)  – it is faster the delete untested piles later on.


The piles were names 1E to 100E and were all 11m deep (planned) – adding them took less than a minute.

I started testing them piles, knowing that I still have to produce a report today, I wanted the data I collect to be as close as possible to final, so that I would need very little office time to work on them later on.


Next thing I did was to make sure the SmartTrigger is ON, when moving around the pile head, many false impacts are triggered by random accelerometer movement. The SmartTrigger looks at the trigger shape, and removes most  of the false triggers, while still passing nearly all the good ones.

With SmartTrigger on I could set the trigger to a very low and sensitive level and still filter out most of the random noise. My hammer taps could now be fast and gentle and I still get more quality data in less time.


In addition, why keep irregular impacts? With Auto-Sort I can set the desired numbers of impacts to collect. Once this number is reached, the impacts are sorted and the most irregular one are removed to the recycle bin. The remaining set of impacts is regular and consistent. The piles were quite easy to test and I have set the AutoSort to 15 impacts. This may sound like a lot, but tapping 2-3 times per second meant I could collect a repetitive set of 15 impacts in less than 30 seconds


I also switched on the [Signal options]-[Convergence] message – it pops up when the collected data is sufficient – As soon as 1) a sufficient number of impact traces have been collected and 2) adding additional impact traces has only a marginal effect on the average result. I selected 15 impacts and 5%

With all this set up – I just started and finished testing the whole wall in under 1.5 hours. A couple of pile were giving me irregular results and needed more attention.

I did not bother with analysis – I just took a brief look to see that I collected good data, and went to the next pile, knowing that I have very little office time on it.

Coming next – how to save on Analysis and Report time

Posted by admin in Inclination Testing, Pile Testing, 2 comments

Can 3D video make the difference?

For years I’m searching for the best way to create an interesting media to present in a simple way, how simple and effective it is to run tests with the Piletest products. We tried nice brochures, and presentations – boring! We tried filming a video – Extremely complicated, as it requires a live outdoor construction site, and eventually you can not film the process in the ground. Now we have made this animated video, which is self explanatory, yet unlike a presentation it is a 3D animation, which makes it exciting to watch – Here it is:

See also versions in Spanish and French voice

Posted by Gadi in Inclination Testing, Pile Testing, 0 comments