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Well for me the easy method is to do an estimate.
Below Major Pointers for doing an estimate. (The Easy way is to
take it from a book)
First we have a look at the Delivery. = HOW WILL THE PIPE GET
THERE. Once we know this we can estimate an delivery
estimate.
Then we have a look at Fitup = What type of pipe is it is. Is it
Seamed / Seamless / Finwall / Thik Wall / Rolled / Spiral/ preped /
macine prep. All This can effect the the time for the Fitup
Then we have a look at the Weld it self. I would suggest only work
with Arc Time then Add Reel / Rod Changes / Setup etc. (The Reason
with different method of Welding Example Stick / Mig etc) Will have
differnet time Then you add Effeciency / Job Difuiculty Factors /
QA / Material Type / etc.
Now you should have a good time for a weld.
吋径＝焊口当量、焊接当量（dia-inch）
1 dia-inch=1吋的管道*1个焊口
DN25 （1吋）的管道一道焊口是1 dia-inch
DN50（2吋）的管道一道焊口是2 dia-inch
DN80（3吋）的管道一道焊口是3 dia-inch
......类推。
总的焊接吋径简单累加就行了（DIN 就是
焊接当量，国外叫达因，是指直径1英寸的一个焊口为1个焊接当量（1达因），10个1英寸的焊口就是10达因，2个5英寸的焊口也是10达因，这种统计方法只考虑了焊口直径没有考虑壁厚的影响，所以只适用于壁厚在8毫米以下的焊口。超过8毫米每增加2毫米加乘一个0.1的系数。）。
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