Hello everyone,

I am a fresh graduate mechanical engineer and right now I am working at a fabrication company where we do welding and beveling for large pipes. these days we are working with a chines Company SEPCO to fabricate some pipes for them and for the sake of productivity calculation, they said our productivity must be 150" diameter, and they gave us a formula to calculate the actual diameter for pipes with a thickness larger than 8mm.

the formula as follows:

**Spool size *(1+(thickness in mm - 8/2)*0.1)**

let me give an example: let's say that we have a 56" spool with a thickness of 25.4 mm, according to their equation the actual diameter will be:

**56"*(1+(25.4-8/2)*0.1)** = **104.72**

**104.72** is the actual di and it is the one that we will use to calculate productivity.

I tried to ask them about it but they are refusing to give an answer. so I was wondering if could help.

does anyone know anything about this formula and why they are using 0.1?

****the beveling degree is 37.5 (it is Auto Welding) **

thank you

## Comments rated to be Good Answers:

Re: effect of thickness on Auto welding" by spades on 11/21/2017 5:03 AM (score 2)Re: effect of thickness on Auto welding" by Kevin LaPaire on 11/22/2017 9:32 AM (score 2)## Comments rated to be "almost" Good Answers:

Re: effect of thickness on Auto welding" by PWSlack on 11/21/2017 10:26 AM (score 1)Re: effect of thickness on Auto welding" by James Stewart on 11/21/2017 3:41 PM (score 1)Re: effect of thickness on Auto welding" by JohnDG on 11/22/2017 5:23 AM (score 1)Re: Effect of Thickness on Auto Welding" by phoenix911 on 11/22/2017 10:05 AM (score 1)Re: Effect of Thickness on Auto Welding" by Tornado on 11/25/2017 2:48 AM (score 1)