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00700 FAILURE OF POLYPROPYLENE LINED PIPE IN SULFURIC ACID - A CASE HISTORY

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Product Number: 51300-00700-SG
ISBN: 00700 2000 CP
Author: Ali A. A1-Beed
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Polypropylene (PP) and PVDF lined pipe experienced frequent failures in spent (60-78%) sulfuric acid after about seven to ten years in service. The failures were due to exceeding the design temperature when mixing 98% acid where high temperature is generated which then created thermal stress in the liner and bolted flared joints and developed cracks and product leaks. The PP was replaced by Polytetrafluoroethylene (PTFE) lined pipe using proper bolting torque. PTFE has been in service for more than 7 years without any failure Key words: Polypropylene, Polytetrafluoroethylene, Spent Sulfuric acid, Polyvinylidene Chloride.
Polypropylene (PP) and PVDF lined pipe experienced frequent failures in spent (60-78%) sulfuric acid after about seven to ten years in service. The failures were due to exceeding the design temperature when mixing 98% acid where high temperature is generated which then created thermal stress in the liner and bolted flared joints and developed cracks and product leaks. The PP was replaced by Polytetrafluoroethylene (PTFE) lined pipe using proper bolting torque. PTFE has been in service for more than 7 years without any failure Key words: Polypropylene, Polytetrafluoroethylene, Spent Sulfuric acid, Polyvinylidene Chloride.
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Sulfuric acid is one of the most important elementary substances of the chemical industry.  There is no stainless steel or even a nickel base alloy available which is suitable over the entire concentration range.  This paper will give corrosion data in up to 75 % sulfuric acid at boiling temperature for various commercial grades as well as for some new developmental alloys.
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