Potable water supply components

Details Potable water supply components Potable water supply components

1995-05-17

1999-07-06

Bell, Janyce

Coating processes

Interior of hollow article coating

Metal base

148282, 148253, 148254, 138145, 427318, 427399, B05D 722, C23C 806

Patent

active

059195193

ABSTRACT:
A method of treating a potable water supply component, for example a pipe, pipe coupling or tap body, made of a leaded copper-based alloy such as a brass or gun metal, in order to inhibit the leach out of lead from the alloy by potable water during service, comprises treating at least internal surfaces of the component with an aqueous solution of an acid that forms a substantially water insoluble compound with lead. The acid is preferably ortho-phosphoric acid.

REFERENCES:
patent: 2711391 (1955-06-01), Kahler
patent: 2834659 (1958-05-01), Mathre et al.
patent: 3420715 (1969-01-01), Ayres
patent: 3879231 (1975-04-01), Watanabe et al.
patent: 4089707 (1978-05-01), Shaffer et al.
patent: 4233088 (1980-11-01), Kronstein
patent: 5076941 (1991-12-01), Boffardi et al.
American Army Standard MIL-M-10578 (1980).
Oliphant, WRC, "Changing Perceptions As To The Significance of Potential., Sources of Lead Contamination in Domestic Water Systems", pp. 1-16 (1992) (no mo.).
Boffardi, Materials Performance, vol. 29, No. 8, Aug. 1, 1990.

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