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Participant

Join Date: Nov 2006
Location: MYSORE
Posts: 4

SS piping Material for HCL & H2So4

01/07/2007 7:24 AM

Hello,

Please help me to select the piping material for Sulphuric Acid & Hdrochloric acid with 25% Concentration. I selected SS-316. Is it okay. Please refer me a correct web site along with your suggestion.

Thank you

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Anonymous Poster
#1

Re: SS piping Material for HCL & H2So4

01/07/2007 5:20 PM

I don't know what your application (process temperature or stuctral requirements). With that being said you might want to investigate HDPVT also known as "kynar or Sygef". 316 will not stand up to extended exposure in a strong perchlorate acid enviorment.

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Anonymous Poster
#2

Re: SS piping Material for HCL & H2So4

01/07/2007 11:25 PM

i had used following materials:

pr(kg/cm2) temp(oC) moc

1)21% hcl 5 150 cs+PTFE

2)88% H2SO4 10 60 cs+PTFE

3)21% & 31% HCL 7/10 80/60 PP to suit 10kg/cm2

SHINDE N K

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Guru
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#3
In reply to #2

Re: SS piping Material for HCL & H2So4

01/08/2007 12:50 AM

For Hcl I would suggest Hastelloy Alloy B2 and for 25% concentration by weight of H2SO4 Carbon Steel PTFE lined. These are only general statements as the question does include temperatures or pressures etc

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Participant

Join Date: Nov 2006
Location: MYSORE
Posts: 4
#5
In reply to #3

Re: SS piping Material for HCL & H2So4

01/08/2007 2:53 AM

Dear Sir,

Thank you for the suggestion. The pressure is 5 bar & temp. is 50 deg C.

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Anonymous Poster
#4

Re: SS piping Material for HCL & H2So4

01/08/2007 1:07 AM

browse matweb.com at times it gives very useful solutions instantly.

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Anonymous Poster
#6

Re: SS piping Material for HCL & H2So4

01/08/2007 3:26 AM

Plastic.

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Member

Join Date: Dec 2006
Posts: 5
#7

Re: SS piping Material for HCL & H2So4

01/08/2007 3:43 AM

There is no need to use exotic and expensive pipe systems for this application.

Reinforced Epoxy Resin Systems will provide extended opereating life at lower installed cost.

A saver all round!

Suggest you look at www.futurepipe.com for pipe information and www.advalve.com for suitable valves.

Valvemaker

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Guru
Canada - Member - Toronto, Ontario (South Parkdale On The Lakeshore) Engineering Fields - Marine Engineering - Great Lakes School Of Marine Technology (Owen Sound and Port Colbourne) Technical Fields - Architecture - Private Practice 1976-1990 Technical Fields - Education - Toronto Teachers' College 1971 Technical Fields - Marketing/Advertising - Founding Member Hobbies - Hunting - Founding Member Hobbies - Target Shooting - Founding Member

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#8

Re: SS piping Material for HCL & H2So4

01/08/2007 5:10 AM

While 316 Stainless is known for its resistance in this area, the problem has always been the propensity of sulphur, and particularly in its oxide form, to combine with the material used for its transportation. You might get a better response from a polymer transit material, as over time, the acid will etch the stainless and enhance the pollution process of the metal's various vulnerable components.

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Associate

Join Date: Dec 2006
Posts: 26
#9

Re: SS piping Material for HCL & H2So4

01/08/2007 6:41 AM

stainless steel with molybdenum content is less susceptible to pitting and chloride attack. SS317L is more resistant to acids than SS316. AT 38 DEG C it is more resistant to acid corrosion. resistance increases with molybdenum content.

Alloys 317LMN and 317L stainless steels are considerably more resistant than conventional chromium-nickel types to solutions of sulfuric acid. Resistance increases with alloy molybdenum content. These alloys are resistant to sulfuric acid concentrations up to 5 percent at temperatures as high as 120°F (49°C). At temperatures under 100°F (38°C) these alloys have excellent resistance to solutions of higher concentration. However, service tests are recommended to account for the affects of specific operating conditions that may affect corrosion behavior. In processes where condensation of sulfur-bearing gases occurs, these alloys are much more resistant to attack at the point of condensation than conventional Alloy 316. The acid concentration has a marked influence on the rate of attack in such environments and should be carefully determined by service tests.

www.sandmeyersteel.com is a site where you can refer the properties of stainless steels.

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Anonymous Poster
#10

Re: SS piping Material for HCL & H2So4

01/08/2007 4:05 PM

Try checking in with Haynes Alloy, International Nickel, and Carpenter Technology for a material recommendation

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Power-User

Join Date: Oct 2006
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#11

Re: SS piping Material for HCL & H2So4

01/08/2007 10:09 PM
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Guru
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#12

Re: SS piping Material for HCL & H2So4

01/17/2007 11:56 AM

Several plastics would be suitable at room temperature; there is no need to use metals.

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