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Material For Sulphuric Acid Service

sulphuric acid material selection acid material selection

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#1 varunpassi

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Posted 21 March 2015 - 01:32 AM

Hi All,

 

In a refinery project, we have to  unload sulfuric acid from standard barrels to atmospheric storage tanks for which barrel unloading pumps have to be used. I wish to know what material will be suitable for this application for the below mentioned parameters. Our process team has specified SS 316L, but as per the link provided below SS 316 seems to be not suitable. Kindly guide me.

 

Parameters:

 

1. Liquid Pumped - 98% H2SO4

2. Operating Temperature - 40 deg.C

3. Specific Gravity - 1.84

4. Pump Type - Barrel Unloading PC Pumps

5. Rated Discharge Pressure - 2.20 kg/cm2

 

 

Link for material selection

 

http://www.coleparme...ical-Resistance

 

Thanks for the help in advance.

Regards,

Varun



#2 breizh

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Posted 21 March 2015 - 01:58 AM

Hi

you may find what you are looking for .

 

Good luck .

 

Breizh


Edited by breizh, 21 March 2015 - 03:55 AM.


#3 fallah

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Posted 21 March 2015 - 02:40 AM

varunpassi,

 

That link is only a guide for material selection and as its contains it doesn't accept any responsibility for the cosequences of wrong selection...

 

Anyway, SS 316L can be a good choice for acid sulfuric 98% since it's a molibdenum bearing grade...



#4 Zauberberg

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Posted 21 March 2015 - 02:50 AM

See the FAQ's from Dupont: http://www2.dupont.c...ipment_FAQs.pdf

 

We used Carbon Steel for concentrated Sulfuric Acid service in refinery, and the system had operated reliably. The key two things to remember are:

 

- Purge the lines with N2 after you complete the loading

- Do NOT install trace heating on Sulfuric acid lines



#5 fallah

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Posted 21 March 2015 - 03:22 AM

Also high pumping velocity, concentration decreasing say due to humidity absorbtion (even falling by 2-3%), air bubbles entrapment are among the matters can create problem by using CS and can't be simply preventable...



#6 P.K.Rao

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Posted 21 March 2015 - 03:58 AM

As long as the concentration does not fall below 98%, I have seen using carbon steel  tanks in some water treatment plants, because concentrated sulfuric acid.is not reactive at 98% and above . 



#7 Kiran T

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Posted 21 March 2015 - 08:39 AM

i agree with rao sir, i found recently one near miss of the same . 98 % sulfuric acid transfer line was remain as a dead line for approx 1 year with blind flange at end of pipe ( length of 300 meter), one day line start leakage from bend and we tried to remove line but suddenly tiny hole found on line and gas/vapor start leakage with extreme pressure.   



#8 Zauberberg

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Posted 21 March 2015 - 10:31 AM

The key things one needs to remember when using CS in concentrated sulfuric acid environment, are to avoid elevated temperatures (corrosion rates increase exponentially) and dilution of the acid (e.g. from atmospheric moisture). if you can manage these two, expected service life of Carbon Steel will be very long.

 

Below are a few links showing additional information with regards to H2SO4 and corrosion.

 

http://www.sulphuric...n/corrosion.htm

http://www.tantaline...rrosion-57.aspx



#9 Zauberberg

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Posted 28 March 2015 - 12:32 PM

Recently I came across this publication - it may be helpful to you (see attached).

If possible, try to obtain a copy of the NACE RP0391 "Materials for Sulfuric Acid" for more detailed information.

Attached Files






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