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Get Acrobat Reader You will need Acrobat Reader to view pdf Slurry Piping Applications

Solids or slurry handling can create erosion in addition to corrosion. The degree of erosion is dependent on the nature of the solids being handled. Tests have shown that RESISTOFLEX Plastic-Lined Piping Products have a narrow window for solids handling. Operation outside of this window requires the installation of test spools and fittings. A 90° elbow is the preferred fitting to determine compatibility. Based on testing, the recommended liners for solids handling are PTFE, and PVDF. Compared with PTFE or PVDF, polypropylene liners wear twice as fast, and carbon steel wears 6.5 times faster. The following list defines the window of potential applications for PVDF and PTFE.

  • Solids concentration should be at 50 percent or higher.
  • Fluid chemical composition must be compatible with the plastic liner.
  • Ideally, flow velocity should be kept at 2 to 4 ft/sec (0.6 10 1.2 m/sec) and should not exceed 7 ft/sec (2.1 m/sec).
  • Particle size should be less than 250 mesh (63 microns) for little wear and between 250 to 100 mesh (63 to 150 microns) for some wear. Particle size greater than 100 mesh (150 microns) may result in significant wear of the liner.
  • Tees or long radius elbows should be substituted for short radius 90° ells.
  • Consider using MULTI-AXIS® plastic-lined piping for slurry service. Reason: the bend radius for MULTI-AXIS® piping is 3D or SD, compared to a 1.5D bend radius for conventional plastic-lined pipe. The more gradual "sweep" in MULTI-AXIS® pipe may reduce the degree of erosion in slurry handling.

Test Results

Tests were performed to determine the relative performance of our plastic liners against erosion. The data generated compared the volume loss of each plastic liner relative to the volume loss of carbon steel when exposed to a slurry. The results are presented in the following graph. (Note: the values represent the volume loss of the liner relative to the volume loss of carbon steel when no oxidants or corrosive materials are present in the carbon steel).

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