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
- 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.
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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