Thickness Monitoring of pipe vs Designed Thickness?

Hii,
I've found out the thickness in a thickness monitoring report of a SS pipe (2" Sch. 40S) to be 5.4mm while the thickness of the 2" Sch 40S pipe in ASME b36.19 is 3.91mm. So is this possible that the pipe swells up and thickness of the pipe becomes greater than as stated in B36.19 or there is a flaw in Thickness Monitoring Report??
The service of pipe is Sulphuric acid. Pressure would be the head of tank (i.e max. height of fluid in tank) as the line is at the bottom of tank and temp. is atm.

This is obviously a type-O error ...I'll bet they meant 2" sch.80S for the 5.4mm, which matches exactly the thickness of sch.80s piping, as does the 3.91mm for sch.40s.

Thanks for ur reply 11echo..
I also think that it's a type error.. but have you heard of any case in which the pipe swells...?

I've heard of piping plugging up (with minerals) but never where it accumulates "extra" steel and attaches it to the inter pipe walls, if that's what your asking? There is a condition with tanks where the wall swells down near the foot of the tank when the stress of a semi full tanks is too great for the wall thickness, this condition is called "elephants foot", you can google it and see some good pictures of this.
saprefresh.oes.ca.gov/module4/4I_Reservoirs.html