Chromate versus non-chrome treatment of refinery cooling tower effluents

Conference · Mon Jan 01 04:00:00 EST 1979 · Natl. Pet. Refiners Assoc. Annu. Meet. Pap.; (United States)

OSTI ID:6568948

Tanis, J N ^[1]; Keys, C

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1. Drew Chem. Corp.

Zinc chromate treatment of cooling water circulating at 2700 gpm at Placid Refining Co.'s 36,000 bbl/day refinery was replaced by treatment with 150 ppm of Drew Chemical Corp.'s organic corrosion inhibitor Drewgard 187 because of current expansion projects involving a 20,000 bbl/day vacuum unit, a 40,000 gpm cooling water demand, and a maximum allowable chromate discharge of 1.6 lb/day. Calcium hypochlorite was replaced by gaseous chlorination for microbiological control. Corrosion rates for mild steel under the Drewgard 187 treatment have been 2-4 mils/yr. An attempt to treat the cooling water with an inorganic polyphosphate produced considerable fouling due to the local makeup water quality. A comparison of traditional zinc-chromate technology combined with various chromium removal systems showed that the Drewgard program was more economical.

• OSTI ID: 6568948
• Report Number(s): CONF-7903175-
• Conference Information: Journal Name: Natl. Pet. Refiners Assoc. Annu. Meet. Pap.; (United States) Journal Volume: AM-79-40
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ANTIFOULANTS
BIOLOGICAL FOULING
CHEMICAL REACTIONS
CHEMISTRY
CHLORINATION
CHROMATES
CHROMIUM COMPOUNDS
COMPARATIVE EVALUATIONS
CONTROL
COOLING TOWERS
CORROSION INHIBITORS
FOULING
HALOGENATION
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
LIQUID WASTES
MECHANICAL STRUCTURES
MICROORGANISMS
OXYGEN COMPOUNDS
PETROLEUM REFINERIES
STEELS
TECHNOLOGY UTILIZATION
TOWERS
TRANSITION ELEMENT COMPOUNDS
WASTES
WATER CHEMISTRY