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testing new overhead cranes

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mortazaa

Electrical
May 3, 2003
1
We have a problem on testing new installed crane due to expansion projects in factory
We did dimensional test by surveying on those cranes as they are installed in site and some one is in operation
We compared the result with DIN and FEM and many discrepancies were shown
Suppliers believe that crane are tested in construction phase in factory and all results were good and measured values in site are not valid because:
1- deviation are related to the base (structure, girder and rails) and not to crane and crane is deformed due to deviation of the installation base
2- standards (DIN, FEM.) are not valid for testing cranes under operation condition and is used just for construction
As we are using the same method for old crane and where we have values out of standards there are some defects and trying to achieve standards improves crane condition we believe that acceptance of such cranes will create many problems and therefore we asked them:
1-as we have all measurements done on structure where could be problem must be indicated and modified to have a standard base
2-if present standards don’t answer our requirements for testing cranes under operation what will be the right method and what is normally in other plants
But unfortunately up to we didn’t get any answer would you please help us to find the solution specially for last question (what is the standard of test for crane under operation? and is there any special condition to be prepared on carne to be tested? and if we are going to do test under normal condition how will be done and comparison with which values is acceptable?
If you have any written documents on this matter please send us
Best regards
 
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If you are in the US, contact:

Crane Certification Enterprises Inc.
6772 Glenella Drive
Cleveland, OH 44131
216-447-3070

If outside the US, do a search on the internet for Crane Certification or Crane Inspection companies.
 
Think this might be eastern europe! Don't know what FEM is but DIN is common throughout europe. I think SGS do crane load certification and again most european countries will have an office.

Seems to me that the supplier is saying that on relocation of the gantry crane the rails were out of spec and that this has caused buckling (or perhaps something slightly less dramatic) of the frame of the crane. Don't know what the DIN spec is for gantry crane rails but 2-3mm tolerance should be achievable. Suggest that this first gets sorted out. Next probably a good idea to have testing done of any points which were subject to excessive stress, MPI, UT could be carried out to check for cracking of welds, if bolts might as well replace. Then check if dimensionally back to spec.

I am ready to be corrected on this but I think that the only test required for your crane to be certified is a load test with a calibrated load.

Zambo
 
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