×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

ASME Below-the-Hook Lifting Devices - Lifted Load Questions

ASME Below-the-Hook Lifting Devices - Lifted Load Questions

ASME Below-the-Hook Lifting Devices - Lifted Load Questions

(OP)
Hello All!

A customer wants me to check an existing equipment skid for operating load cases and a hoisting and rigging load case. This post is about the hoisting and rigging load case only and the application of ASME BTH-1.

The equipment skid is comprised of various pumps, compressors, pipes, and electrical boxes supported by a steel frame 13'x36' in plan view. There are 4 lifting lugs that I used the ASME BTH-1 standard to check. I also checked the weld connection to the steel frame using this same standard.

Now, the equipment skid framing needs to be checked for the hoisting and rigging load case. Do I stop using ASME BTH-1 and just apply impact factors to the skid framing? Or do I stay consistent and consider the equipment skid framing as part of the lifting devices to be checked?

My engineering judgment tells me to be consistent and consider the skid frame as part of the BTH lifting device assembly. Otherwise I would apply impact factors that seem arbitrary. I am curious to see how others have applied ASME BTH-1 and where the "cut off point" is for applying the standard when the lifted load is part of the BTH lifting device.

Thank you in advance.

RE: ASME Below-the-Hook Lifting Devices - Lifted Load Questions

I would normally just design the lifting lug...

There are some exceptions... some mining regulations require that the 'frame' be designed with a SF=5 against failure and if going down the shaft, a SF=10 may be required for both the lug and the frame and rigging.

Dik

RE: ASME Below-the-Hook Lifting Devices - Lifted Load Questions

Assuming this is a typical skid with those devices permanently attached to it, I would say that your skid is the "load" itself and neither it nor the lugs attached to it are lifting devices per ASME BTH. As it happens, BTH is a handy reference for designing such items, so it's appropriate to use it as a reference. But it would be at your own judgment what design standards, if any, actually applied to the skid or lifting lugs welded to the skid. Note that if BTH/ASME B30.1 applies to the skid, then you're also obligated to label it for allowable load, load test it, etc.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources