pipespec. corrosion allowance

[europipe]

Just saw something new;
guys here invented various corr. all. in one spec.
up to dn65 0,5mm ; up to dn65 1mm ; up to dn300 1,5mm,
Is it acceptable that small bores should be replaced more often in the same pipeline?
I should think it's not very practable.
Cracks, What's your opinion?

 

[XL83NL]

I dont see any immediate advantage to replace small bore piping if they're welded (to larger dia run pipes).
To me this is non-standard practice. Curious to hear other's opinions on this.

 

[Ripz]

It's poor engineering practice to set Corrosion allowances based on pipe size. This is all dependant on the service conditions and material of construction.