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Coinneach
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New Zealand - Member - Member Papua New Guinea - Member - Lapun

Join Date: Mar 2007
Location: Kawerau, New Zealand
Posts: 25

Austenitic Stainless Steels

08/01/2010 4:12 PM

I am trying to look at potential causes of premature failure of a (Spirax Sarco) steam sparge nozzle. The process takes soap and 95% sulphuric acid, mixes them through a static mixer, then injects steam to heat the mixture. It seems that the sparge nozzle is corroding/eroding faster than normal. The process vessel is made from 2RK65 austenitic stainless steel, whilst the sparge nozzle is made from 316 austenitic stainless steel. The aggressive process transformation takes place at 270kPa and 100 deg C

Can there be any chance of a some type of galvanic cell causing the sparge nozzle to erode. Any other ideas.

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Pathfinder Tags: steam sparge Sulphuric acid tall oil
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aurizon
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#1

Re: Austenitic Stainless Steels

08/01/2010 10:33 PM

Steam in this service is very noisy. A lot of that noise is caused by cavitation of steam bubbles. The cavitation enhances any corrosion and as the bubbles collapse onto surfaces they cause micro pitting. repetitions make the pits grow together.

Some bronzes resist better. You can also buy ceramic liners that resist pitting. You can also create a rubbery liner that is more tolerant of the cavitation.

Sparger makers know all this...ask them

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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#2

Re: Austenitic Stainless Steels

08/02/2010 12:03 AM

Given 95% sulphuric acid and dilution using steam, it comes as a surprise that stainless steel , indeed any steel, is in use at all.

Check out the Cole Palmer materials compatibility database for some suitable alternative materials.

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SloopJohnB
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Join Date: Sep 2007
Posts: 36
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#3

Re: Austenitic Stainless Steels

08/02/2010 3:05 AM

Try these poeple. http://www.hydro-thermal.com/
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zzjsjx111
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Join Date: Aug 2010
Posts: 1
#4

Re: Austenitic Stainless Steels

08/04/2010 10:48 PM

i agree with you ,

if you want to buy crusher please visit the website:www.hammer-crushers.com
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