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5 Items to Consider When Installing Welded Pad Eyes for Rigging

  
  
  
  

Structural Connection Points for Attaching Chain Hoists (load drifting)

welded padeyes4riggingIn power plants, refineries, aboard ships, in paper mill and other industrial settings, equipment must be installed or removed to accommodate the facility’s operation. Often riggers must be creative when rigging loads in tight quarters where there are no existing overhead cranes.

If the proposal is to use existing structural beams or columns for chain hoist connections prior to a load drifting activity a number of things should take place.

  1. Ensure that the facility engineering team has approved the rigging point based on the anticipated loading. Obtain the maximum allowable working load limit in writing.
  2. Identify the proper connector for the beam; welded pad eye, bolted swivel hoist ring, beam clamp, etc. Get a qualified engineer to approve the connector, and in the case of weldments get the details of the required material type, size, shape, thickness and shackle pin hole size and its location. If the desired connector is a pad eye also get a listing of the engineer’s minimum “removal criteria” based on wear, deformation and weld condition.
  3. Have a qualified welder, install the pad eye and inspect the welding using the recommended non-destructive examination method (dye penetrant, magnetic particle, etc.). A documented load test may be required.
  4. Mark the pad eye for its maximum rated capacity and angular limitations as provided by the engineer. The pad eye can be serial numbered (RFID identifier) so that it can be referenced on a site plan for original data, limitations and the name of the approving engineer. Maximum capacity and angular markings should be stenciled near the pad eye for future “quick reference” by all rigging personnel.
  5. Inspect all rigging pad eyes before and after use to ensure their integrity.

Chain hoist information can be obtained by reviewing ASME B30.16. This document can be obtained at www.iti.com/bookstore or through www.asme.org.

Happy trails to my crane and rigging friends.

Mike Parnell
President
ITI – Field Services

Comments

Mike, Great information re. this issue. Thanks for taking the time to keep us on track. Engineering should spec. the welding/inspection criteria as well along with the other material specs you indicated.
Posted @ Monday, July 11, 2011 2:41 PM by Keith Hilbish (McKinley Service and Equipment)
Yes, material type of the steel will help the engineer specify the design of the pad eye, and determine if it is compatible with the connection point. Nice touch Keith. All the best, Mike
Posted @ Monday, July 11, 2011 7:46 PM by Mike
Mike: 
 
This morning (4/11/13) I identified a missing table in ASME B30.26-2010. Would like to discuss with you. 
(208)533-7185, 208.520-4630 (mobile)
Posted @ Thursday, April 11, 2013 11:38 AM by Randy MacDowall
yes I am having an issue with finding the proper form for fabrication of pad eyes. I need a form or diagram to explain the correct dimensions of the pad eyes that we need to fabricate for the lifting procedures we are doing.
Posted @ Wednesday, February 05, 2014 10:08 AM by jeff cross qa/qc
Jeff, 
 
The following two websites help with lifting lug/pad eye theory and design. 
 
This website gives the explanation of the various factors that go into the design of a lifting lug. It takes some time to read and digest but I think it’s worth it: 
http://www.maximumreach.com/PEHELP.htm 
 
This calculator is used in conjunction with the website above and allows you to input your lug requirements for design dimensions: 
http://www.maximumreach.com/PadEye.asp 
 
I hope this helps.
Posted @ Wednesday, February 05, 2014 12:53 PM by Christina Lanham
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