ASME B16.5 Flange Hole Chamfering

[lt34]

Hi everyone,

I would like to know is there any section or part of code how to complete bolt hole finish ASME B16.5 flanges.
Is there any standard or engineering practice I might refer 2x45 deg. chamfering to flange bolt holes.

Thanks.

 

[Gr8blu]

Let' see if this helps ... ref ASME B16.5 and ASME B16.47

 

[lt34]

Let' see if this helps ... ref ASME B16.5 and ASME B16.47

View attachment 1990

Hello,

Thanks for your response. However, I ment the chamfer of the bolting holes. Please see the attached picture. There should be some standard code or engineering practice.

 

[LittleInch]

None that I can find.

Why do you want to chamfer it?

I wouldn't go more than 1.5mm.

 

[The Obturator]

'Back in the day' my company's manufacturing drawings, which included such flanges, simply stated on the drawing 'Break all corners/edges'. In practical terms, this simply meant the tip of the cutting tool simply touching the corners and/or the deburring operation/operative hand running a larger size drill in the holes to 'break the edge'. In other words common sense was applied.

 

[lt34]

'Back in the day' my company's manufacturing drawings, which included such flanges, simply stated on the drawing 'Break all corners/edges'. In practical terms, this simply meant the tip of the cutting tool simply touching the corners and/or the deburring operation/operative hand running a larger size drill in the holes to 'break the edge'. In other words common sense was applied.

I guess this is an engineering practice. I reviewed ASME B16.5, ASME B16.47 and Sec. VIII Div.1 as well. There are no such information.
Thanks for your reply.

 

[lt34]

None that I can find.

Why do you want to chamfer it?

I wouldn't go more than 1.5mm.

Hello,

To avoid any injury, crack due to bolt tensioning. This is required as per our company policy.

Thanks.

 

[Compositepro]

Cleaning-up corners should sufficient. Chamferring is more robust. Gun barrels often have the muzzle bore exit set back from the end so the bore is less likely to get dinged. That would affect accuracy. It also help line up the holes to install the bolt studs.