Method for producing a helically wound pipe having a predetermined diameter
AssigneeSyracuse Tank & Manufacturing Co., Inc.
InventorGeorge L. Campbell
Life of this patent
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Abstract
A method for forming helically wound pipe from an elongated sheet of material having a longitudinal axis wherein markings are provided perpendicular to said longitudinal axis adjacent the edges of the elongated sheet of material at predetermined spaced intervals. The elongated sheet is fed in a direction parallel to its axis and wound helically to form a helically wound pipe having adjoining revolutions while maintaining the distance, parallel to said longitudinal axis, between successive indicia adjacent the edge of one revolution and the indicia adjacent the edge of the adjoining revolution constant.
Claims6
In a method of forming a helically wound pipe of a predetermined diameter from an elongated sheet having a longitudinal axis and having a pair of opposing edges extending parallel to said longitudinal axis, the improvement comprising:
- marking said elongated sheet adjacent said opposing edges thereof with indicia at predetermined spaced intervals, said indicia so marked extending perpendicular to said longitudinal axis;
- feeding said elongated sheet in a direction parallel to its axis;
- helically winding said elongated sheet to form a helically wound pipe having adjoining revolutions, and during said winding maintaining the diameter of said helically wound pipe equal to said predetermined diameter by maintaining a predetermined distance, parallel to said longitudinal axis, between indicia adjacent the edge of one revolution and the indicia adjacent the edge of an adjoining revolution.
Dependencies are inferred from the claim text.