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Modsonic Instruments Mfg Co Pvt Ltd
We are leading Indian manufacturer and exporter of portable “Ultrasonic Testing Equipment”
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Technical Discussions
sujith rajagopal
India, Joined Jun 2015, 9

sujith rajagopal

India,
Joined Jun 2015
9
12:03 Feb-20-2017
what is the depth of side drilled hole in ASME sec V DAC block

i have a dac block for ultrasonic testing as per asme sec V.
it is 38mm thick with side drilled hole 3 mm
The side drilled hole is drilled upto a depth of 1 inch.
Is it ok?? But in ASME sec V it is recommended as minimum of 1.5 inch.
i am confused,somebody please advice.

 
 Reply 
 
Visakh Chandran P
Engineering,
Brahmos Aerospace Tvpm. Ltd., India, Joined Dec 2013, 11

Visakh Chandran P

Engineering,
Brahmos Aerospace Tvpm. Ltd.,
India,
Joined Dec 2013
11
09:38 Feb-21-2017
Re: what is the depth of side drilled hole in ASME sec V DAC block
In Reply to sujith rajagopal at 12:03 Feb-20-2017 (Opening).

As per my knowledge the reflecting surface of a defect in a DAC Block is a simulation of the least possible defect size allowed in the hardware being inspected.So logically and technically speaking the dia. of your SDH is 3.0mm and only depth is 1 inch which is lesser than the dimension specified as per standard and if you are making a DAC and inspecting and clearing as per that,your job will surely meet the requirements specified in the code.But on the other side the degree of your rejection will be on higher side in cases of indications crossing DAC.

 
 Reply 
 
Uli Mletzko
R & D, Retired
Germany, Joined Nov 1998, 89

Uli Mletzko

R & D, Retired
Germany,
Joined Nov 1998
89
12:13 Feb-21-2017
Re: what is the depth of side drilled hole in ASME sec V DAC block
In Reply to Visakh Chandran P at 09:38 Feb-21-2017 .

In my opinion this discussion has two aspects.

First, it is clear that the diameter and position of a SDH have to be according to the DAC regulations in the applied standards, e.g. ASME etc.

Second, the drilling depth, i.e. length, of the SDH has to be larger than the lateral diameter of the sound beam at the applied sound path. The sound beam never should touch the lateral surface (drilling surface) on one side, and never should pass regions beneath the drilling depth on the other side. We could say, that the lenth of the SDH should be 'infinite' lateral to the sound path. This conditoin is leading to the required drilling depth in DAC blocks, e.g. accordung to ASME.

It might be, that under special conditions one could decrease the required driilling depth, if this physical UT aspect could be complied.

Regars,
Uli Mletzko
(retired, MPA, Universitiy of Stuttgart, Germany).

 
 Reply 
 

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