Hole Edge Distance Requirement
Hole Edge Distance Requirement
(OP)
As part of my job as a structural engineer I review vessel drawings to be sure they got the hole size and pattern right for anchor bolts. Recently I reviewed a drawing that had a 2.2" dia. hole that was only 1.8" from center of hole to edge of base plate. The vessel designer asked me if that was okay. I said not in the AISC steel design world it's not. You need at least 1.25 x nominal diameter of the bolt. Is there any ASME code requirement for bolt edge distance?





RE: Hole Edge Distance Requirement
Design of Anchor Bolt for vertical vessels in Megyesy (Pressure Vessel Handbook), Table 1 indicates a nominal 1 x bolt size to edge. For a 2" bolt, 2" to the edge. . Moss (Pressure Vessel Design Handbook) provides a design procedure if validation is required.
RE: Hole Edge Distance Requirement
Every company has their own standard how the edge distance shall be for the top ring ( we use bolt diameter + 1/2"). If no standard, then follow any vessel design handbook.
You shall ask that vessel designer if he is following any standard or handbook, and ask him to show you his basis.
Where is your vessel engineer? who shall take the whole responsibility, not designer who may not know many details. It is scary that a designer asking you that kind of question, that means he does not know what he is doing.
RE: Hole Edge Distance Requirement
There are no ASME code requirements for anchor bolt edge distance at base plates.
The AISC minimum edge distance is for steel to steel connections. They don't apply to steel to concrete joints.
RE: Hole Edge Distance Requirement
http://www.aisc.org/DynamicQuestion.aspx?Grpid=6&a...
I believe the FAQ also applies to vessel base plates.
RE: Hole Edge Distance Requirement