Design of underground buried pipe linesDescripción completa
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Acid s;urry report
Design Notes for Slurry/Froth Piping Coarse Tailings. •
In general these lines will be run at a 3% slope. Because of the high wear in these lines they will be Chrome carbide lined. • Long straight runs of pipe need not be lined if the pipes can be rotated. • All bends will be 5D unless space constraints prevent their use, when 3D will be used . • Piping should be run as direct as possible p ossible to minimize wear. • If we have the option 90 deg bends should be avoided in favor of 45 deg or 30 deg. • Because of the high wear and need for frequent replacement piping systems should be • connected with ‘Victaulic’ couplings instead of flanges, h owever should the system become unstable then flanges will need to be used. All bends should be either flanged or coupled. • Maximum straight run for lined piping is 6m (to be confirmed by vendor) • At pump suctions a Piping Specialty Spool is required to transition from regular pipe size to • vendors ‘non standard size. These will be 1 meter long and be flanged at pump connection and coupled at pipe end. Pump suctions will have Eccentric reducers flat on bo ttom. • Discharge can be concentric. • After all bends a section of straight pipe up to 5D in length will be lined. • In addition to suction spools a drop out spool is required for maintenance and also to provide • 1600mm clear space for casing removal. Pipe supports for slurry lines will be clamped onto pipe as op posed to welded. This allows • for pipe rotation and frequent replacement. For pipelines couplings should be provided every e very 60m for rotation. •
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Froth piping will be run at a 3% slope where possible. Pockets/low points will be avoided. Froth pumps discharge nozzle will be oriented ‘top horizontal where possible and at 45deg to vertical when not. Pump suctions between pump box and first pump will be as short as possible. Suction to first pump in system will use eccentric reducers flat on bottom and subsequently eccentric reducers will be flat on top. 3x’D’ bends are to be used where possible. Long radius elbows will only be used with prior approval from process.
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With regard to slurry/froth piping in sizes above 24” where we are using pipe bends bend s (as opposed to long radius elbows) and the spec calls for slip on flanges to B16.47 Type A bolt pattern.
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The fact that industry standards define ‘WN flanges’ and d o not cover slip on flanges dictates that we have to use “manufacturer standards”. This also requires the use of 300mm tangents on bends.
