Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
(OP)
Hello.
I have been assigned to choose a mass flowmeter to measure 99% urea at 140 Deg C and 20 bar.
I have been checking Endress+Hauser and Krohne documents,and:
E+H recommends only Ti tube for temp < 100 Deg
Krohne recommends either SS 316 or Ti for temp < 90 Deg.
However, beside that this will require the flow to be cooled; it also required to completely change the flow as I believe 99% urea flow will crystallize at temp < 135 deg or so.
I am at a loss currently as I can't find enough data on corrosivity of a rather pure urea flow. Is it even corrosive to being with?
Thanks for the help.
I have been assigned to choose a mass flowmeter to measure 99% urea at 140 Deg C and 20 bar.
I have been checking Endress+Hauser and Krohne documents,and:
E+H recommends only Ti tube for temp < 100 Deg
Krohne recommends either SS 316 or Ti for temp < 90 Deg.
However, beside that this will require the flow to be cooled; it also required to completely change the flow as I believe 99% urea flow will crystallize at temp < 135 deg or so.
I am at a loss currently as I can't find enough data on corrosivity of a rather pure urea flow. Is it even corrosive to being with?
Thanks for the help.





RE: Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
This suggests that 317L or 904L would be suitable at higher temps as would Ti.
I would be leery of 316L in these conditions.
Urea
CO(NH2)2
Temp. °C: 180
4438 : 0
4439 : 0
904L : 0
Ti : 0
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Plymouth Tube
RE: Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
May I ask if the table is referring to the pure melted Urea?
Also, what does the 0 numbers in from of the materials stand for?
RE: Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
RE: Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
RE: Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
since they don't give a concentration I presume that it is 100%. This is their normal practice.
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Plymouth Tube
RE: Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
Thanks a lot for the link, I didn't know they provide their tables online!
Based on their tables, corrosion for Standard Cr-Ni-Mo is also '0'.
I believe 316l, which is the normal stainless steel material for flowmeters tube, falls under this category?
RE: Material to use with Urea 99% at 140 Deg, 20 Bar for flowmeter
I would step up.
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Plymouth Tube