Electrically heated pipe assembly

An electrically heated pipe assembly comprising:

• a pipe having a longitudinally-extending, electrically insulating outer surface;
• a pair of conductors extending longitudinally of said pipe, said conductors being generally parallel to and spaced apart from each other;
• and,
• a semi-conductor pattern engaging said outer-surface and said conductors, said pattern being arranged to provide a plurality of axially-spaced conductive stripes and, between adjacent ones of said stripes, an area that is free from said semi-conductor pattern,
• said stripes and said conductors being on the same radial side of said sheet and each of said stripes engaging both of said conductors.

An electrically heated pipe assembly comprising:

• a pipe having a longitudinally-extending, electrically-insulating outer surface;
• a pair of parallel conductors mounted on said outer surface on generally diametric opposite sides of said pipe;
• an organic plastic tape wrapped helically around said pipe outer surface;
• and,
• a semi-conductor pattern carried on a radially-inwardly facing surface of said tape, said pattern comprising a pair of parallel conductive stripes extending longitudinally of said tape and spaced apart from each other, a semi-conductor free area intermediate said stripes and a semi-conductor free area extending along each of the longitudinal side edges of said tape, whereby said stripes extend generally helically of said pipe and engage both of said conductors.