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- since 1996 -

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Technical Discussions
Joseph Pascente
Engineering
Lixi, Inc., USA, Joined Nov 1998, 39

Joseph Pascente

Engineering
Lixi, Inc.,
USA,
Joined Nov 1998
39
04:02 May-02-2000
"ULTRASONIC INSPECTION OF WOODEN UTILITY POLES"

We have tested various wooden poles in Australia at the Electricity Board with our Profiler and were successful in determining the status of the pole. UT was not able to duplicate these results.




    
 
 
M S Johannes
Consultant,
Pensioner, South Africa, Joined Mar 2000, 2

M S Johannes

Consultant,
Pensioner,
South Africa,
Joined Mar 2000
2
02:06 May-10-2000
Re: "ULTRASONIC INSPECTION OF WOODEN UTILITY POLES"
Based on the research that has been conducted in Eskom we would recommend that you look at the Resistograph manufactured in Germany by IML. With this unit one can quantify the density in wooden poles fairly accurately, without inducing unacceptable amounts of damage.
It has been found that in spite of various decay mechanisms present in wooden poles, some poles last, whilst others, which may look OK, actually fail. To assess the remnant strength of wooden poles, Eskom developed a Mechanical Pole Tester, which physically applies a bending moment to the pole and with the aid of a small computer calculates the remnant strength of a single pole. Excellent results are achieved using the mechanical pole tester. Tests to validate the test method included the physical destruction of a number of poles under controlled conditions.
Our research and development has shown that Ultrasonic testing of wooden poles is unreliable and does not provide one with repeatable results. There are too many variables which affect the UT energy. Hence, we would recommend the use one of the above mentioned methods.

M S Johannes
Chief Consultant
(Mechanised NDT)


Tel: +27 11 629 5095
FAx: +27 11 629 5777


    
 
 
G. Bennett
G. Bennett
03:16 Nov-01-2001
Re: "ULTRASONIC INSPECTION OF WOODEN UTILITY POLES"
I suggest you look at the final published study results of the NSW Electricity Association. WoodScan an ultrasonic method, developed by Foley International of Auckland achieved the highest Category A rating. The Foley method has been adopted by VECTOR (Auckland) as their best practice and is currently being assessed by numerous Australian utilities.

: Based on the research that has been conducted in Eskom we would recommend that you look at the Resistograph manufactured in Germany by IML. With this unit one can quantify the density in wooden poles fairly accurately, without inducing unacceptable amounts of damage.
: It has been found that in spite of various decay mechanisms present in wooden poles, some poles last, whilst others, which may look OK, actually fail. To assess the remnant strength of wooden poles, Eskom developed a Mechanical Pole Tester, which physically applies a bending moment to the pole and with the aid of a small computer calculates the remnant strength of a single pole. Excellent results are achieved using the mechanical pole tester. Tests to validate the test method included the physical destruction of a number of poles under controlled conditions.
: Our research and development has shown that Ultrasonic testing of wooden poles is unreliable and does not provide one with repeatable results. There are too many variables which affect the UT energy. Hence, we would recommend the use one of the above mentioned methods.

: M S Johannes
: Chief Consultant
: (Mechanised NDT)

:
: Tel: +27 11 629 5095
: FAx: +27 11 629 5777




    
 
 
Craig Ruch
Craig Ruch
20:11 Sep-14-2012
Re: "ULTRASONIC INSPECTION OF WOODEN UTILITY POLES"
In Reply to M S Johannes at 02:06 May-10-2000 .

I you decide you are going with IML resistograph testing I would like to let you know that my company make replacement drills for all of the IML drill machines. We can save you 40 percent in consumables. DACK Manufacturing Solutions - US number 406-892-2423. Please feel free to contact me with any additional information.

    
 
 

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