How to calculate IDT? inch dia thickness

[leher258]

Hello,

Could you please let me know how to calculate IDT?
Pipe size 20
No of joints 10
Wall thickness 14.02 mm

Thank you

 

[1503-44]

What is IDT
Welding context?
Capacity context?

Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[Dhurjati Sen]

Inch dia is just a method for contractors to quote welding rate.

In your case, it will be 20"x10joints = 200 inch dia.

DHURJATI SEN
Kolkata, India

 

[1503-44]

Some include a multiple for number of passes to distinguish welding effort between a 7.5mm wall thickness from a 14mm wall thickness, but that is dependent on company estimate practices. There is no commonly defined method for such a calculation. Its a "User specific" term.

Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[hateMech]

We also use this at my company for tendering and planning purposes.

Here's a good reference on estimating: Link

Page 124 should be of interest for you, if you think it is worth the money.

Even the redacted preview on their website gives you a general idea on the methodology.