Tolerance of a stainless steel vessel
Tolerance of a stainless steel vessel
(OP)
Hi there,
We are ordering a coil which comes in a vessel with:
outer diameter: 9.2 feet - 2.8 meters
inner diameter: 7.9 feet - 2.4 meters
length: 10.8 feet - 3.3 meters
The material is stainless steel 304L
The manufacturer gives a tolerance of +/-5mm (0.2 inches) in the inner diameter and +/-10mm (0.4 inches).
Are these tolerances normal?
What if it was in aluminium?
thank you
regards,
We are ordering a coil which comes in a vessel with:
outer diameter: 9.2 feet - 2.8 meters
inner diameter: 7.9 feet - 2.4 meters
length: 10.8 feet - 3.3 meters
The material is stainless steel 304L
The manufacturer gives a tolerance of +/-5mm (0.2 inches) in the inner diameter and +/-10mm (0.4 inches).
Are these tolerances normal?
What if it was in aluminium?
thank you
regards,





RE: Tolerance of a stainless steel vessel
RE: Tolerance of a stainless steel vessel
of course not.
I forgot to mention the wall thickness. It's 10mm (0.4inches)
The coils is inside the volume defined by the inner and outer diameters (with end-caps)
cheers,
RE: Tolerance of a stainless steel vessel
www.pfi-institute.org
Regards
r6155
RE: Tolerance of a stainless steel vessel
In the case of 7.9 feet - 2.4 meters would be 7.6 inches - 192mm.
This looks way too much for me, wouldn't it?
thanks
regards,
RE: Tolerance of a stainless steel vessel
8% is the ovality of a pipe bend, not the coil.
Regards
r6155
RE: Tolerance of a stainless steel vessel
https://app.aws.org/forum/topic_show.pl?tid=16261
Some, must be as agreed to in the purchase documents
http://www.eng-tips.com/viewthread.cfm?qid=150064
Some are contained in a book called the "Pressure Vessel Handbook"
http://www.inspection-for-industry.com/pressure-ve...
There are probably DIN and NORSK documents out there ...
MJCronin
Sr. Process Engineer
RE: Tolerance of a stainless steel vessel
However, setting tight OD bend tolerances will cost more money over "just accepting industry normals" .
Can you live with the difference in OD's in your heat exchanger in your application? (Special supports, extra welding, harder to slide the HX out through a manhole or hatch?) If you can live with their proposal, use it. If not, call them to come and give you their reasons for the current tolerances, their schedule and their new price for tighter tolerances on the bending.