Pipe coating

Details Pipe coating Pipe coating

1982-04-16

1985-06-11

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

174 11R, 174 47, G01R 3112, H01B 714

Patent

active

045231419

ABSTRACT:
Pipe coating having a thermal insulating layer of polymeric material and an outer barrier layer is provided with an additional electro-conductive layer intermediate between the two layers to facilitate testing of the latter for discontinuities by conventional electric testing equipment for detecting discontinuities in the outer barrier layer, e.g. by measuring electrical conductivity or resistivity along the face of the barrier layer.

REFERENCES:
patent: 2056085 (1936-09-01), Alles
patent: 2857931 (1958-10-01), Lawton
patent: 3420277 (1969-01-01), Ceintrey
patent: 3719884 (1973-03-01), Laroche
patent: 3731710 (1973-05-01), Bauer et al.
patent: 3807458 (1974-04-01), Royston
patent: 3992237 (1976-11-01), Gerholt et al.
patent: 4197423 (1980-04-01), Fusen

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