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Slurry Pump: What's it, and how does it work
Slurry pumps are often subjected to severe shock loading and shaft whip because of the presence of solids and system upsets. For these reasons soft compression packing is still favored as a method of sealing on the stuffing box.
The choosered method for packing a slurry pump is the "flush" seal shown in Figure 13-5a. Right here the lantern ring is positioned in entrance of the packing rings and a copious supply of clean liquid is injected at a pressure higher than the prevailing slurry pressure in the stuffing box. The clean liquid acts as a barrier and prevents the ingress of abrasive particles that cause packing and sleeve wear. The disadvantage of this system is that giant quantities of flushing water are required and the pumped product will be diluted. This system is really helpful for severe abrasive services.
An alternative methodology for sealing is shown on Figure thirteen-5b. Right here the lantern ring is positioned between packing rings. This configuration is called a "weep" seal. Again, clean liquid should be injected at a pressure higher than the prevailing slurry pressure close to the stuffing box. Product dilution is significantly reduced compared to the "flush" seal design. Nevertheless, the barrier so created is just not very effective, causing abrasive particles to penetrate and cause wear. If the service is only mildly abrasive, then grease can be used in lieu of liquid.
An approximation of flushing necessities for a "flush" type packing arrangement for typical throat restriction devices where no attempt has been made to curtail the usage of flushing water and the place the pressure differential is 15 psi is displayed in Figure 13-6. Such a restriction will have an annular radial clearance within the order of .007 occasions the sleeve diameter. The size of the throat bush will be about the identical because the width of one turn of packing.
It's inconceivable to predict the exact quantity of flushing water required when the packing is "weep" type, since this depends on shaft deflection and gland maintenance. Nonetheless, under regular operating conditions, weepage could be within the order of 5% of the values acknowledged in Figure thirteen-6 for "flush" packing arrangement.
In most cases, seals and flush necessities are provided in ignorance of the real pressure prevailing at the stuffing box, which results in excessive use of gland water and increased maintenance.
Built into some slurry pump designs are methods to reduce pumped pressure on the stuffing box by hydrodynamic means. (For instance, see Figures 13-7 and 13-eight for diagrams of pump out vanes on impellers and expellers.) The side-suction-pump configuration is subjected only to suction pressure and has an advantage over end-suction pumps, one not absolutely acknowledged by users. By proper application of impeller pump out vanes and expellers, the pressure on the box could be reduced to almost zero. This is called a dry box arrangement. In these cases, weep-type seal is satisfactory, with either water or grease being injected into the cavity formed by the lantern ring.
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Website: https://www.qualityslurrypump.com/products/
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