Tapped Hole for Lifting Eyebolt - Edge Distance
Tapped Hole for Lifting Eyebolt - Edge Distance
(OP)
Similar questions seem to have been asked in the past but nothing I can find for lifting activities.
We are looking at possibly tapping the outer diameter of some large blind flanges to attach a lifting eyebolt. I'm trying to understand if there is a minimum edge distance between the tapped hole and the faces of the flange?
I've heard rules of thumb but surely there is a requirement for this scenario, especially when we are working with lifting equipment.
Any suggestions as to codes/standards that contain the correct information would be greatly appreciated.
Morts81
P.S. I understand there could possibly be implications with tapping pressure retaining flanges and I'm dealing with these separately.
We are looking at possibly tapping the outer diameter of some large blind flanges to attach a lifting eyebolt. I'm trying to understand if there is a minimum edge distance between the tapped hole and the faces of the flange?
I've heard rules of thumb but surely there is a requirement for this scenario, especially when we are working with lifting equipment.
Any suggestions as to codes/standards that contain the correct information would be greatly appreciated.
Morts81
P.S. I understand there could possibly be implications with tapping pressure retaining flanges and I'm dealing with these separately.





RE: Tapped Hole for Lifting Eyebolt - Edge Distance
RE: Tapped Hole for Lifting Eyebolt - Edge Distance
RE: Tapped Hole for Lifting Eyebolt - Edge Distance
Tell us about the eyebolt size, diameter and depth of threading
MJCronin
Sr. Process Engineer
RE: Tapped Hole for Lifting Eyebolt - Edge Distance
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RE: Tapped Hole for Lifting Eyebolt - Edge Distance
RE: Tapped Hole for Lifting Eyebolt - Edge Distance
RE: Tapped Hole for Lifting Eyebolt - Edge Distance
Is there a reason you couldn't put a D-shackle through one of the bolt holes in the flange instead, to lift the flange vertically?
RE: Tapped Hole for Lifting Eyebolt - Edge Distance
I wouldn't go for anything less than 0.5D of the hole you're drilling for the eyebolt.
I'm sure you could look at this in terms of shear of a slot of material trying to detach vertically, but otherwise looks like an FEA job to me.
if the load is truly vertical with a vertical flange face then in theory there is no real limit, just a reduction in load capacity and bending moment available.
You get orifice flanges tapped so maybe look at the requirements of those.
So long as you don't go beyond the bolt circle diameter I don't think you'll interfere with the flange itself, but might want to replace the eyebolt with a plug or bolt to prevent corrosion. Or leave it screwed in.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Tapped Hole for Lifting Eyebolt - Edge Distance
RE: Tapped Hole for Lifting Eyebolt - Edge Distance
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand