Teflon lined process pumps save over $25,000/yr in acid regeneration plant

Journal Article · Mon Mar 01 00:00:00 EST 1982 · Chem. Process. (Chicago); (United States)

OSTI ID:7086389

Ross, L ^[1]; Gaines, A

---

1. Armco, Inc., Ashland, KY

Armco's Eastern Steel Division Works in Ashland, KY includes an acid regeneration plant that uses the spray/roaster process to recover hydrochloric acid and high purity iron oxides from spent pickling liquor. Two centrifugal pumps, one operating and one on standby, were used to pump the corrosive and erosive mixture at 175-200/sup 0/F to the spray nozzles in the roaster. The impeller, casing and other wetted parts were of an acid resistant exotic metal, but the pumps had a service life of only 2 to 3 months. The impellers had to be replaced after about six weeks because of wear that reduced the discharge pressure and impaired the performance of the spray nozzles. Maintaining the pumps and replacing them several times a year was extremely expensive, since each pump cost about $6000. A 3 X 1 1/2 X 8 1/2'' centrifugal pump specifically designed for severe corrosive service was installed on a trial basis in February 1980. The process pump is built to AVS standards and features a 3/16'' thick fluoropolymer liner molded in place to the ductile iron case, and a fully open faced ductile iron impeller encapsulated with fluoropolymer. The pumps have been available for a number of years with liners and impeller coverings of Du Pont's Teflon-FEP fluorocarbon, and the acid regenerating plant has been using them in various corrosive applications since the startup in 1972. The acid regeneration plant is very pleased with the trouble-free performance of the Teflon-FEP lined pumps. They are reliable, essentially maintenance free, and maintain the discharge pressures required for efficient operation of the spray nozzles.

• OSTI ID: 7086389
• Journal Information: Chem. Process. (Chicago); (United States), Vol. 45:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CENTRIFUGAL PUMPS
CORROSION PROTECTION
COST
HYDROCHLORIC ACID
PROTECTIVE COATINGS
RECOVERY
IRON CHLORIDES
IRON OXIDES
POLYVINYLS
TEFLON
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
HIGH TEMPERATURE
IMAGES
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
COATINGS
DATA
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
IRON COMPOUNDS
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
PUMPS
SYNTHETIC MATERIALS
TRANSITION ELEMENT COMPOUNDS
360400* - Polymers & Plastics- (-1987)
360105 - Metals & Alloys- Corrosion & Erosion
400102 - Chemical & Spectral Procedures
320303 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Equipment & Processes