Pumps, centrifugal single-suction

Centrifugal Pump End Suction pump, End Suction, Single... 

Figure 3-4. Centrifugal Pump, double suction single-stage impeller. (Courtesy Allls-Chalmers Mfg. Co.)...

This specification covers horizontal, end suction, vertically split, single-stage centrifugal pumps with top centerline discharge and hack pullout feature. 

Figure 3-48. Upper limits of specific speeds for single suction overhung impeller pumps handling dear water at 85°F at sea level. (By permission, Hydraulic Institute Standards for Centrifugal, Rotary, and Reciprocating Pumps, Hydrauiic Institute, 13th ed., 1975.)...

Figure 3-50. Typical centrifugal pump characteristic curve vrith auxiliary specific speed curve. Double-suction, single-stage, 6-in. pump, operating at 1760 rpm constant speed. (By permission, Karassik, I. and Carter, B., Centrifugal Pumps, McGraw-Hill Book Co., inc., 1360, p. 197.)...

Figure 3-65 gives the upper limits of specific speeds of single-stage, single and double-suction centrifugal pumps handling clear water at 85°F at sea level [22]. 

Table 3-26 gives the specific speeds for various centrifugal pump types. Table 3-27 gives the suction specific speed ratings for single-suction and double-suction centrifugal pumps. These tables are for pumps handling clear water. 

More pumps fail as a direct result of improper installation than any other single factor. The predominant reasons for these failures include starvation, caused by inadequate or inconsistent suction conditions distortion, caused by pipe strain or improper foundation and turbulent that results from piping or entrained gas problems. Centrifugal pump installation must follow Hydraulic Institute Standards, which provide specific guidelines to prevent these installation and performance problems. This chapter will address the fundamental requirements for proper installation. 

Figure 44.21 Typical end-suction, single-stage centrifugal pump...

Close-Coupled Integrated Two-Stage Liquefaction (CC-ITSL), 6 843 Close-coupled single-stage horizontal end suction pump, 22 63-64 Close-coupled vertical centrifugal pump designs, 22 64... 

The single most common operational problem in a process plant is loss of suction pressure to a centrifugal pump. If the suction pressure is too low, the discharge pressure and the discharge flow become erratically low. The suction pressure, while low, remains comparatively steady. 

Figure 7.3. Performance curves of single-suction impellers corresponding to two values of the specific speed, (a) Ns - 1550, centrifugal pump, (b) Ns = 10,000, mixed and axial flow pumps.

Figure 7.7. Characteristic curves of centrifugal pumps when operating on water at 85°F (Allis Chalmers Co.), (a) Single suction, 1750 rpm. (b) The pump of (a) operated at 3500 rpm. (c) Multistage, single suction, 3550 rpm.

Figure 7.9. Some types of centrifugal pumps, (a) Single-stage, single suction volute pump, (b) Flow path in a volute pump, (c) Double suction for minimizing axial thrust, (d) Horizontally split casing for ease of maintenance, (e) Diffuser pump vanes V are fixed, impellers P rotate, (f) A related type, Ihe turbine pump.

A single-stage single-suction centrifugal pump is recommended to deliver red product nitric acid from the base of the absorption tower to the product bleaching column. 

The pump selected for the transport of red nitric acid from the absorption column to the product bleaching column is a single-stage single-suction centrifugal-type pump. An AJAX E32-20 pump is recommended for this application. The application requires the pump to satisfy a maximum flowrate of 9.5 m3/h with a maximum differential head of 450 kPa. 

Pumps general purpose centrifugal (single and two stage, single suction). Price includes pump, steel base, and coupling, but no motor. Small numbers... 

What is the upper limit of specific speed and capacity of a 1750-r/min single-stage double-suction centrifugal pump having a shaft that passes through the impeller eye if it handles clear water at 85°F (302 K) at sea level at a total head of 280 ft with a 10-ft suction lift What is the efficiency of the pump and its approximate impeller shape ... 

A single-suction centrifugal pump is driven by a 60-Hz ac motor. The pump delivers 10,000 gal/min (0.63 m3/s) of water at a 100-ft (30.5-m) head. The available net positive suction head is 32 ft (9.75 m) of water. What is the best operating speed for this pump if the pump operates at its best efficiency point ... 

As a general guide, single-suction centrifugal pumps handle up to 50 gal/min (0.0032 m3/s) at total heads up to 50 ft (15 m) either single- or double-suction pumps are used for the flow rates to 1000 gal/min (0.063 m3/s) and total heads to 300 ft (91 m) beyond these capacities and heads, double-suction or multistage pumps are generally used. 

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