The Sugar Engineers

Specification For Vacuum Pan, Evaporators And Juice Heater Tubes More Than Three Metres Long


This specification covers the material selection, dimensional tolerances, heat treatment, surface condition, inspection and testing, marking, and packing for tubes that will be installed in vacuum pans, evaporators and juice heaters in which the tubes are more than three metres long.

Quantities and Sizes

  • Number of tubes required:
  • Length of tube required:
  • Nominal outside diameter of tubes
  • Wall thickness of tubes


    The tubes shall be of TP439 stainless steel, with a longitudinal welded seam

    Code of Manufacture

    The tubes shall be manufactured, inspected and tested in accordance with ASTM A268 Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

    Dimensional Tolerances

    The dimensional tolerances shall be in accordance with ASTM A268

    Heat Treatment

    The heat treatment shall be in accordance with ASTM A268

    Surface Condition

    The external and internal weld bead shall be made flush. The tubes shall be supplied free of mill scale. This can be achieved either by pickling or bright annealling. The tube ends shall be cut square and deburred.

    Inspection and Testing

    The tubes shall be inspected and tested in accordance with ASTM A268. The inspection and testing will be done using an independent inspection authority, at the client's cost.


    Each shall be marked in accordance with ASTM A268 and in addition shall bear the following marks Sugartech Specification


    The tubes shall be packed in bundles with wooden frames to protect the tube ends. The bundles shall be strapped and shrink-wrapped in plastic. A means of lifting the bundle, in a way that will not damage the tubes, shall be provided.