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THE BEST SULPHURIC ACID PIPELINE MATERIAL  

September 1, 2008 I AM TRYING TO FIND THE BEST MATERIAL USED FOR THE TRANSPORTATION OF 92 TO 96% H2SO4 THROUGH A 14-INCH PIPELINE, 20 KGF/CM2, AMBIENT TEMPERATURE (MAX 60 DEGR. C) WHERE 7 KM OF IT RUN UNDERGROUND AND 2 KM AERIAL IN A MARINE ATMOSPHERE. IT IS IMPORTANT TO KNOW IF SUCH INSTALLATION EXISTS AND, IF THERE IS ONE, WHERE IT IS LOCATED. ULISSES AMADO Pipeline Engineer - RIO DE JANEIRO, RIO DE JANEIRO, BRAZIL

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Hi Ulisses,

My preference would be towards a PVC dual laminate material. Why dual laminate? Because the fibreglass would add strength to the PVC.

Cheers

Freeman Newton - White Rock, B.C. Canada

Dear Freeman,
Thanks for your suggestion, but in this case the use of PVC (polivinyl chloride) is not available. As I mentioned before in my question, the pipeline will be constructed under the ASME code B31.4 (Pipeline Transportation Systems for Liquid Hydrocarbons and other Liquids). We are thinking of using carbon steel API 5L Gr. B specification and I would like to know about any experience regarding corrosion on this material (liquid velocity 1.8 ft/s).

Ulisses Amado
- Rio de Janeiro, RJ, Brazil

Hi again Ulisses

You say that PVC is not available .. that I sure DON'T believe.

My background is mainly in plastics and were you to use PVC, then cemented joints must NEVER be backswelded immediately but after min 24 hours.

Re steel ... well, that would be OK UNLESS air got at it
because steel is OK for conc.sulphuric BUT with air ingress you'd dilute the sulphuric and get immediate corrosion due to that acid's absorption of moisture from the air.

Freeman Newton - White Rock, B.C. Canada