Head Forming Table
Head Forming Table
(OP)
Does anyone have a copy of a 2:1 ellipsoidal head forming table that they can upload? I'm referring to a table that tells you what the minimum forming thickness is expected to be based on plate thickness and diameter. I have a table already, but it was an old faxed copy so some of the values are too illegible to read.





RE: Head Forming Table
http://www.ksecal.com/ellipsoidal-head-thickness-c...
RE: Head Forming Table
RE: Head Forming Table
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Head Forming Table
Interesting to see that the values between the two sheets are off by up to 0.030".
RE: Head Forming Table
RE: Head Forming Table
RE: Head Forming Table
The minimum thickness should come directly from the head manufacturer. If you're not the vessel manufacturer, then simply specify a minimum thickness and let the vessel manufacturer figure out what nominal thickness is needed to stay above the minimum.
I would not recommend using a list of head manufacturers and taking the most conservative. You could come up short if your list is not comprehensive. More likely, you'll come up thicker than you need to, which means extra material and welding cost.
RE: Head Forming Table
RE: Head Forming Table
This is not a good way to do engineering.
Regards
r6155
RE: Head Forming Table
I am not in the business of constructing vessels. Wasted welding is not my concern since the vessels are already built. I deal with vessels that have seen damage and need to determine the remaining life. Many of the manufacturers who built the vessels have gone out of business.
If we have a vessel with current thickness data (UT) and a tmin, we need to know what the original starting thickness was. Without baseline UT or the forming thickness, we can't determine a long term corrosion rate. I think taking the highest forming thickness would be the conservative approach as it would give the highest corrosion rate.
I also want to use these tables to confirm original design data. I've encountered U-1As with typos before and like to use tables like this as a confirmation that the data is correct.
RE: Head Forming Table
ASME PCC-2 2015 Repair of Pressure Equipment and Piping
API 579-1/ASME FFS-1, June, 2016
Fitness-For-Service
API 510 TENTH EDITION, MAY 2014
Pressure Vessel Inspection Code:
In-service Inspection, Rating, Repair,and Alteration
NB 23 Part 3 NATIONAL BOARD INSPECTION CODE 2015
Repairs and Alterations
Regards
r6155