Crosshole Ultrasonic Logging

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

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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

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.


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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