Electrically heated riser pipe for a fluid supply system

A liquid supply supply system including in combination:

• a rigid liquid supply pipe for supplying liquid from an underground supply source to an aboveground utilization point;
• a rigid outer pipe with an inside diameter substantially greater than the outside diameter of said liquid supply pipe for encasing said liquid supply pipe with a space therebetween;
• an above ground end cap and a below ground end cap on said outer pipe, each end cap having at least one opening for permitting passage of said supply pipe therethrough;
• rigid foam thermal insulation means substantially filling the space between said supply pipe and said outer pipe;
• an elongated straight cavity in said insulation means including therein a predetermined portion of the length of said supply pipe and having an open upper end, the cavity extending from the above ground end cap downwardly toward said below ground end cap, said predetermined portion of said supply pipe having its outer periphery exposed along one side in said cavity, an elongated electric heating means removably positioned in said cavity alongside the exposed portion of said supply pipe and in heat exchange relationship therewith;
• and
• said above ground end cap having a second opening therein aligned with the open upper end of said cavity and being of such size and shape as to allow removal of said elongated heating means from said cavity through said second opening irrespective of connections made to said supply pipe.