Pump sizing

The kieis aie of varying sizes and production units can handle from 225—1400 kg, adjusting proportionally the pump size and speed. Most machines are highly versatile so as to accommodate the kind of textile being dyed they are able to control rate of temperature rise, volume ofHquor flow, and time of dye apphcation. 

For quick pump selec tion, manufacturers often give the most essential performance details for a whole range of pump sizes. Figure 10-30 shows typical performance data for a range of process pumps based on suction and discharge pipes and impeller diameters. The performance data consists of pump flow rate and head. Once a pump... 

Adjustment may also be required for differences in altitude between the test site and the commercial installation. In general terms, if the plant elevation is higher, the vacuum pump size must be increased, and conversely. 

Firewater Systems. These systems are best laid out by contractors or other specialists. National Fire Protection Association (NFPA) rules will spell out required coverage, typical pump size, and other standard items. A small jockey pump will maintain system pressure at all times. 

The single contingency which results in the largest accumulation (B-E) of liquid safety valve releases during 30 minutes, regardless of any associated vapor rate. The level at point E is used for pumpout pump sizing. 

Use physical limits of pipe size, restrictive orifices, and pump sizing to limit excessive flow rates. 

Above 1000 Flow through valves may become critical factor Larger pump size selection run at reduced speed-e.g. 3 X size at 1000 cenhistokes running at one-third speed. Modification of valve design may be desirable for higher viscosities... 

An oil with a 32.6° API gravity at 60°F is to be transferred from a storage tank to a process unit that is 10 ft above the tank, at a rate of 200 gpm. The piping system contains 200 ft of 3 in. sch 40 pipe, 25 90° screwed elbows, six stub-in tees used as elbows, two lift check valves, and four standard globe valves. From the pump performance curves in Appendix H, select the best pump to do this job. Specify the pump size, motor speed, impeller diameter, operating head and efficiency and the horsepower of the motor required to drive the pump. 

You need a pump that will develop at least 40psi at a flow rate of 300 gpm of water. What combination of pump size, motor speed, and impeller diameter from the pump characteristics in Appendix H would be the best for this application State your reasons for the choice you make. What are the pump efficiency, motor horsepower and torque requirement, and NPSH for the pump you choose at these operating conditions ... 

You must chose a centrifugal pump to pump a coal slurry. You have determined that the pump must deliver 200 gpm at a pressure of at least 35 psi. Given the pump characteristic curves in Appendix H, tell which pump you would specify (give pump size, speed, and impeller diameter) and why What is the efficiency of this pump at its operating point, what horsepower motor would be required to drive the pump, and what is the required NPSH of the pump The specific gravity of the slurry is 1.35. 

Due to the friction of the sliding vanes, the biggest pump size available (water cooled) is about 4001/s. Smaller pumps (0.5-51/s) are air cooled. 

The number of wells manifolded to an individual pump primarily reflects the depth to groundwater, but is also in part dependent on the pump size. In low-permeability formations, wells are typically pumped dry. As long as the pumps sustain sufficient vacuum to all wells at the intake depth, LNAPL eventually enters the well and is evacuated. In higher-permeability formations, fluid is pumped consistently from each well at a maximum rate. In both low- and high-permeability formations, individual pumps work harder to pump from greater depths. Decreasing... 

The control valve/pump sizing procedure proposed above is not without its limitations. The two design equations for the maximum and minimum conditions in general terms are ... 

When driver and pump size permits, baseplates shall have standardized dimensions as given in Appendix M and shall be designed for grouting. These baseplates shall be referred to as API Standard 610 Standard Baseplates, Numbers 0.5-12. ... 

The dependence of the factor from the desired pressure is shown in Fig. 2.75. It should be noted that the pumping speed of single-stage rotary vane and rotary piston pumps decreases below 10 mbar with gas ballast and below 1 mbar without gas ballast. This fundamental behavior is different for pumps of various sizes and types but should not be ignored in the determination of the dependence of the pump-down time on pump size. It must be pointed out that the equations (2.32 to 2.36) as well Fig. 2.75 only apply when the ultimate pressure attained with the pump used is by several... 

For quick pump selection, manufacturers often give the most essential performance details for a whole range of pump sizes. Figure 10-40 shows typical performance data for a range of process pumps based on suction and discharge pipes and impeller diameters. The performance data consists of pump flow rate and head. Once a pump meets a required specification, then a more detailed performance data for the particular pump can be easily found based on the curve reference number. Figure 10-41 shows a more detailed pump performance curve that includes, in addition to pump head and flow, the brake horsepower required, NPSH required, number of vanes, and pump efficiency for a range of impeller diameters. 

Figure 2.38 shows that a volume of 1000 L (chamber and condenser) will be evacuated to 0.01 mbar in -8 min by a pump with the capacity of 100 m3/h. For a volume of 100 L, a pump with a capacity of 10 m3/h is sufficient. The pump for evacuation only can be relatively small. A pump with 100 m3/h has this capacity also at a pressure of 0.05 mbar however, at this low pressure 100 m3/h represents only 1.4 mbar L/s or 1.1 x 10 3 g/s. This pumping capacity is more than sufficient if the leak rate is smaller than 0.01 mbar L/s, which can be expected for most plants. The critical dimension for the pump size can be the gas from the product. In a chamber of 700 L (plus 300 L condenser volume), there may be, e.g., 10 kg of product, which may have a minimum of 10 g (but often 100 g) of air dissolved within, which may become free... 

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