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Hi-Spec Systems
we are specialised in the design, development and manufacture of Phased Array and Time-of-Flight Diffraction (ToFD) ultrasonic inspection systems.
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Technical Discussions
rezha falaq rizki
Indonesia, Joined Jul 2017, 6

rezha falaq rizki

Indonesia,
Joined Jul 2017
6
10:48 Jul-18-2017
Eddy Current VS Hydrotest

I work at pipe industries now. I have problem about pipe/tube inspection.
At pipe mill there are hydro static test and eddy current (EC) test.

I want to ask, can hydro static test replace with eddy current test to detect structure defect?

thanks.

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 776

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
776
02:42 Jul-19-2017
Re: Eddy Current VS Hydrotest
In Reply to rezha falaq rizki at 10:48 Jul-18-2017 (Opening).

NO

1
 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
11:57 Jul-19-2017
Re: Eddy Current VS Hydrotest
In Reply to rezha falaq rizki at 10:48 Jul-18-2017 (Opening).


If the EC test is specified, it has to be done irrespective of the Hydro static test.

The Hydro static test will reveal only the through and through defects or those which have become through and through, under the test pressure.

The EC test will reveal the potential defects that may be above the specified acceptance limits.

Best wishes,

P V SASTRY

1
 
 Reply 
 
rezha falaq rizki
Indonesia, Joined Jul 2017, 6

rezha falaq rizki

Indonesia,
Joined Jul 2017
6
13:25 Jul-19-2017
Re: Eddy Current VS Hydrotest
In Reply to Anmol Birring at 02:42 Jul-19-2017 .

thanks for your ans mr. anmol,
can you give me more explanation about that sir?

 
 Reply 
 
rezha falaq rizki
Indonesia, Joined Jul 2017, 6

rezha falaq rizki

Indonesia,
Joined Jul 2017
6
13:54 Jul-19-2017
Re: Eddy Current VS Hydrotest
In Reply to P V SASTRY at 11:57 Jul-19-2017 .

thanks mr P V Sastry,

how long maximum distance between pipe surfaces and EC coil?
are there any effect about that?
I mean, my coil for 2 inch usage and it uses for pipe 1.3 inch diameter. So, the distance would not be same about pipe surface and coil.
and can the electromagnetic wave "touch" the surface?

 
 Reply 
 
kalaivanan
NDT Inspector, ASNT LEVEL III
TNDT, Thailand, Joined Feb 2016, 76

kalaivanan

NDT Inspector, ASNT LEVEL III
TNDT,
Thailand,
Joined Feb 2016
76
09:06 Jul-24-2017
Re: Eddy Current VS Hydrotest
In Reply to rezha falaq rizki at 13:54 Jul-19-2017 .

Hydrotest -> Ensure No Leak & test the pressure withstand capacity of the system.

Eddycurrent ->Detect the gradual wall thinning/pitting/seam defects, where limited for small and circular cracks.

how long maximum distance between pipe surfaces and EC coil?

Eddy current require 70 to 90 % of fill factor value this value you can calculate by above pic. definition.

From your data "my coil for 2 inch usage and it uses for pipe 1.3 inch diameter"
hope your using Encircling probe gives only 42.2% fill factor not recommended for EC Inspection.

Recommended probe coil ID are 1.41 inch (for Encircling Probe)

Can the electromagnetic wave "touch" the surface?
Eddy current probe has plastic insulated housing, so no need to aware, even if it is touch together. also EC using very lesser voltage for testing.
only thing make sure there is no water contact between the pipe and probe coil before start the inspection process.

1
 
 Reply 
 
kalaivanan
kalaivanan
09:08 Jul-24-2017
Re: Eddy Current VS Hydrotest
In Reply to kalaivanan at 09:06 Jul-24-2017 .

zoom image

Fill factor formula

Fill factor formula
1
 
 Reply 
 
prathamesh
prathamesh
11:00 Jan-26-2019
Re: Eddy Current VS Hydrotest
In Reply to P V SASTRY at 11:57 Jul-19-2017 .

can you state any reference standard where it is been stated that Eddy Current can replace Hydro Test ?

Because recently i came accross with same kind of thing , where we procured cu-ni 90/10 UNS C 70600 Pipes & tubes from Germany and where the Test Certificates of the big bore ( 4" and above diameter Pipes) were Hydro Tested whereas the small bore ( 2" dia. below pipes ) were Tested as EDDY CURRENT .

 
 Reply 
 

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