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- since 1996 -
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Technical Discussions
sarah
sarah
15:39 Mar-23-2011
Scratchs in MT test

hello everyone, first of all i have to thanks all the members for this great site and the huge quantity and best quality of information in ndt field and i would be very happy to be member in this forum
i am engineer sarah i was working as technical office engineer , and i was bored from sitting in the office , so some partners advised me to enter NDT career i recently finished MT. PT course and i am employed as quality controll department as NDT inspector
i dont work in the site, i work in house on inspecting lifting equipment like hooks and shackles and pad eyes , some structure components of cranes before installation and erections
i am confused about something when i do MT or PT test for hook for example i am looking for service defects like cracks only is this right? is the only matter to find cracks or not
because i see often alot of scratch and some notchs
sometimes sharp scratch is it consider defects according to standards and codes, we use AWS specifications
i am looking for your replay and its will be pleasure to me
Regards
Eng.sarah

 
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Andreas
Andreas
16:14 Mar-23-2011
Re: Scratchs in MT test
In Reply to sarah at 15:39 Mar-23-2011 (Opening).

Hallo Sarah ,
I believe that AWS first of all will be not the right spec.
For lifting equipment are applicable spec for new and used equipment.
I am not the specialist for lifting ,but like for all ndt work ,you need to know the proper spec first.
Also most manufacturer can give you drawings for the critical areas.

Regards

Andreas

 
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anjafo
NDT Inspector
Norway, Joined Aug 2009, 204

anjafo

NDT Inspector
Norway,
Joined Aug 2009
204
16:17 Mar-23-2011
Re: Scratchs in MT test
In Reply to sarah at 15:39 Mar-23-2011 (Opening).

your specification should give you an acceptance criteria.

i think it may say something like no relevant linear indications above a certain length or no rounded indications bigger than a certain size.

i have heard people call it a crack inspection before because you are generally looking for service induced defects because welding defects should have been found during the original inspection.

a visual inspector / competent person / lifting inspector should also be checking the lifting equipment and i think they would decide if your "mechanical" damage is within spec, i think it might be deemed non relevant for the MPI / NDT inspector.

if i see some mechanical damage on a re-inspection of a pad eye i just point it out to the lifting inspector. unless its on the weld then I may insist for it to be fixed.

 
 Reply 
 
Manuel Haces
Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection, Mexico, Joined Jun 2002, 122

Manuel Haces

Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection,
Mexico,
Joined Jun 2002
122
19:25 Mar-23-2011
Re: Scratchs in MT test
In Reply to sarah at 15:39 Mar-23-2011 (Opening).

You can find at ASME different criteria for lifting equipment. But it will be a good advise to follow manufacturer recomendations. Regards.

 
 Reply 
 
sadek997
NDT Inspector,
AR, Poland, Joined Feb 2011, 12

sadek997

NDT Inspector,
AR,
Poland,
Joined Feb 2011
12
19:36 Mar-23-2011
Re: Scratchs in MT test
In Reply to sarah at 15:39 Mar-23-2011 (Opening).

Actually ther's no such thing as a test for crack presence because during the MT examination you get an "indication" and not an answer about a type of a defect. You have to search for a code treating about frogings (ther's probably a standard concerning new products) or look for the hook manufacturer's specification and like anjafo said there should be an acceptance criteria thas states e.g. No linear indications above x mm are allowed and no nonlinear indications above x mm wide are allowed.

Sentences about no crack presence ar nonsence, no standard in NDT treats about real defects. Remember that You get only an indication and that can be treated for instance as a crack but yo're never sure of it because ther's no such thing in defectoscopy as a real crack (only indications that look like cracks)

 
 Reply 
 
Pedro
NDT Inspector,
Acuren Inspection, USA, Joined Feb 2011, 2

Pedro

NDT Inspector,
Acuren Inspection,
USA,
Joined Feb 2011
2
18:04 Mar-24-2011
Re: Scratchs in MT test
In Reply to sarah at 15:39 Mar-23-2011 (Opening).

Sarah have you seen the different styles defects in the material you are checking? Also depending on what type of MT machine you are using, sometimes you can see possible non-relevant indications from probe or yoke machines ( ie. scratches from lifting the probe or york from the material.). I would get with your personal on site and see if they have any previous hooks or shackles that have known defects in them and that you can check, so you can have an idea what you are looking for. If material is casting, AWS might not be the best code to use. Check with manufacture and find out if they know what their other customers might use as far as acceptance code.
Hope this helps!
Inspector Pete

 
 Reply 
 
mandar
mandar
06:25 Mar-25-2011
Re: Scratchs in MT test
In Reply to Pedro at 18:04 Mar-24-2011 .

in a good mt system scratches are also indicated and its tough to classify the indications if they are defects , as the part under test is lifting hook the area where scratches appear can be rubbed with a sand paper and retested , this mite remove the scratches but not the cracks , and i agree with all other experts regarding relevant acceptance standards as they have mentioned , but usually it is also mentioned in these standards that relevant indications of size xyz mm etc etc , so first it has to be ensured that its a relevant indication

 
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