An industrial fabricator manufactured a stainless steel auger 100ft. long by cladding a 24in carbon pipe with four different stainless steel curved shapes.
12 ga. x 1-3/4in stainless cones, with a major radius on 12in, a minor radius of 11-1/2in, and a height of 1-5/8in provide support beneath the helical flighting.
3/8 x 4 flat stainless bars rolled helically with holes become the flighting.
12 ga. stainless steel sheets with varying widths rolled helically cover the pipe between the flighting.
And 12 ga. x 1 3/4in conical helical strips are welded between the sheet and the auger flutes in the corner edges. These strips are rolled into a left-hand helix to a 24in diameter with a 25-1/2 degree pitch.
By covering a carbon pipe rather than using a stainless pipe, the manufacturer no doubt saved money. Nevertheless, the design calls for close tolerance work and specialty welding. This is not an “off the shelf” product. When it is put in service, this long auger will transport sugar.
