Pumps and Pumping

How to Derate a Pump Curve for Slurry Pumping

The pump curves published by pump manufacturers are for the performance of the pump on water. Some pump manufacturers use a derating factor to correct the head and efficiency of the pump when pumping slurry.

This a subject which has had a lot of controversy and disagreement It is suggested that the method used be left to the manufacturer The method they use works for them.

As a final check, another factor in the selection of the pump size is the entrance or suction velocity The higher the entrance velocity the higher the wear rate will be on the leading edge of the impeller vanes and the impeller eye. Generally speaking, eye velocities below 15 or 16 ft./sec. are preferred. The velocity must be high enough to insure that the slurry and solids reach the impeller eye, but not so high to cause rapid wear.

Now that we have looked at the parameters which affect the selection and sizing of a pump, let’s take a set of conditions that we have derived by the testing and careful analysis of the system or as supplied by the customer to select a pump:

Flow: 4000 GPM – Mill Discharge Service
Head: 100 ft.
Sp gr of ….Read more

Mining Tailings Pumps

The disposal of mill residues or tailings costs 2 to 6 cents pel ton, however carefully it is done. Residues may be moist sand which can be conveyed by belt or trucked to a dump, moist solid slime which can be handled somewhat similarly, or pulp which can be pumped to a suitable place. The handling of sand and slime does not call for any special comment. With rails, a dump

mineral processing centrifugal pump

may be extended outward or it may be circular, the latter method being preferable. Pumps suitable for pulp have already been described. Pulp should be dammed in a dump made of the drained material. As the solids settle (a little lime or cement added to the pulp helps) and more or less clear water flows to one point for discharge to waste or for re-use in the mill, walls of the slime are built up with a good batter. If they are too steep, they might collapse. On some well-made dumps, every shovelful of slime can be seen up the side of the walls. The author has seen such dumps containing 10,000 to 2 million tons.

A tailings pile should ….Read more

Ceramic Shaft Sleeve For SRL Pump

Ceramic Shaft Sleeve For SRL Pump Increases Part Life By Several Times That of Steel Sleeves

One of the problems of concern to operators of centrifugal slurry pumps is the wear of shaft sleeves and the deterioration of packing material in the gland.

This matter has also been under study by the Engineering Research and Development Department of EQUIPMENT COMPANY for some time. The result is the development of a shaft sleeve of much superior wearing qualities.

The SRL Ceramic Shaft Sleeve, which has undergone destructive field tests for over 18 months, has proved to extend part life several times that of steel shaft sleeves on the same pump, same service. Total maintenance costs and down-time were reduced accordingly.

Steel has always been the here-to-fore accepted material for shaft sleeves for most centrifugal pumps. However, steel in shaft sleeves is subject to pitting, fritting and wear that often results in short part life.grinding-flotation-ceramic

SRL Ceramic Shaft Sleeves are precision formed of high density alumina, fired, and ground to size. The hardness of ceramics (9.0 to 9.5 MOH Scale) resists this destructive action.

In addition, the ceramic sleeve surface is highly polished which, together with its lower co-efficient of ….Read more

OSA Sample Pumps – Vertical Tank Pump

on stream analyzer pumpFor pumping and feeding a slurry sample to a On-Stream-Analyzer (OSA), the classic pump to use is a vertical tank pump. The market for such OSA sample pump appears dominated by Metso. Irony is OSA’s are made by Outotec or Thermo Fisher Scientific, but you must go elsewhere to pump your slurry sample to the X-ray. What size should the OSA sample flow be?

Metso Sala Vertical Tank Slurry Pump, Model VF50 O5, complete with high chrome wear parts (casing, impeller, inlet), mild steel tank, steel shaft with no Shaft seal (no gland water required), 5 HP, 380 V, 60 Hz, 3-phase premium efficiency motor, motor plate, v-belt drive and belt guard.

This pump will suit all 3 duties you described of 150 lpm @ 30% solids, solids s.g=3.0 at 30 ft static head, and line lengths of 50 ft, 100 ft, 200 ft. The 5 HP motor is the smallest motor mounted on Metso pumps.

osa multiplexer trash screen keep sample cleanhttps://www.xore.se

osa sample pumps vertical tank Vertical Tank Pump

osa <a href=….Read more

Power Required for Pumping Water

In Pumping Water, the power required to raise a given quantity of water to any height up to 100 ft. can be calculated from this Table, which assumes the use of a double inlet centrifugal pump of good design working well up to its full capacity and reasonably near to its most efficient speed. To calculate the total power consumption the appropriate horse-power figure in the table must be multiplied by the number of gallons per minute to be pumped and the total effective head in feet.power-required-for-pumping-water

Slurry Pumps

When the slurry cannot be transferred from one machine to the next by gravity, one method of handling it is by means of a Wilfley slurry Pump, which is shown in Fig. 21. It is employed in most modern flotation plants for elevating and transferring all classes of material from coarse gritty slurry to fine slime. Differing considerably in design and construction from the usual type of centrifugal pump, it has the advantage that the conventional stuffing-box is replaced by a centrifugal seal which dispenses with the necessity for gland water and eliminates all wear on the shaft. This seal is so constructed that the intake chamber is open to the atmosphere. The pump can therefore have no suction and must be fed by gravity through the feed opening (35) from a box or sump designed to provide an intake head of at least 4 ft.

Slurry Pumps

The pumping chamber consists of a case (1) and follower plate (3). The runner (25) is of the enclosed type with a single inlet located on the side nearer the drive, and is cast in one piece with the expeller ; the combined casting is illustrated separately in Fig. 22. It is ….Read more

Froth Factor for Pump Sizing

The ‘froth factor’ is a measure of the air contained in the froth. It is quantified by filling a measuring cylinder or bucket, of known volume, with froth and measuring the froth column. After air dissipation the remaining water and solids volume is measured. The ratio of the original volume of froth to the remaining combined volume of water and solids is the ‘froth factor’. Measured ‘froth factor’ values are not employed by the flotation cell or pump designers. These are modified based on experience and application.

Froth transfer between flotation stages requires either gravity flow or pumping. The characteristics of the froth depend to a large degree on the type of ore being treated, the fineness of the particles, the solids concentration, the amount of air in the froth, the type of reagents used and the froth ‘brittleness’. Froth factors for launders and sumps are dependent on reagent addition rates and reagent type, froth brittleness, the ability to add spray water, the nature of the sprays, the design of the launder or sump and the fineness and nature of the particles. Froth factors up to eight to ten have been measured/reported for ores with stable froth structure. These froths require ….Read more

Tailings Pond Water Balance

Water systems in modern mines are complex and an understanding of the tailings pond and plant water balance is necessary. Control of the water balance can avoid problems such as operating losses from water shortages or hazardous releases as a result of a water surplus. Here is a schematic of a typical water balance. By regularly monitoring the various components of the water balance, effective water management can be practiced.

For operators who depend on reclaim for process water, the water balance must be closely monitored. There are many factors that affect the balance and these should all be examined in deriving an equation.

Factors to consider include feed rate of tailing to pond, percentage of water released as supernatant and % retained in deposited tailing, evaporation losses, precipitation contribution both direct and run-off, seepage losses, amount of seepage collected and returned, amount of supernatant discharged from system, reclaim water removal rate and quantity of any other inflow such as pit dewatering. Most operators monitor the quantity of fresh water added to the process from outside sources. The operator should also equip himself with a calculation of pond level vs contained volume. Armed with these pieces of information, rates of rise and rates of advance can be calculated and long term adjustments are possible. Changes ….Read more

Pumps & Pumping Research

  1. Horizontal Process Pumps Modification to Comply With API-610 Sixth Edition Forces And Moments
  2. Diamond like Carbon Coatings Tribological Possibilities and Limitations in Applications on Sintered Silicon Carbide Bearing and Seal Faces
  3. Changes in Pump Vibration Levels Caused by the Misalignment of Different Style Couplings
  4. High Pressure Noncontacting Mechanical Seal for API Applications
  5. A Case History Improved Hydraulic Design Lowers Cavitation Erosion and Vibrations of a Water Transport Pump
  6. Magnetically Driven Centrifugal Pumps Eliminating Seal Problems in Refinery and Chemical Processing Plant Equipment
  7. A Case Study Unusual Problems Discovered During the Rerate of 2800 HP Boiler Feedwater Pumps and Turbines
  8. Vibration Problems With an electric motor for a Centrifugal Pump Installation
  9. Pump Vibrations Acoustics in Pumping Systems
  10. A New Method for Secondary Contaminent of Emissions From Primary Seals
  11. Torsional Vibration in Pump Driver Shaft Trains the role of External Damping from Pump Impellers
  12. CFD Analysis of a Double Suction Cooling Water Pump
  13. New Developed Multistage Variable Speed Drive of High Economy for the Speed Control of Pumps with Powers up to 40,000 ….Read more

Pumps & Pumping Education

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