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Suction specific speed

Suction specific speed deals with pump inlet condition and it is calculated by following equation. [Pg.36]

NPSHR is the required NPSH at pump suction. For doifolc suction pump, Q equals half of flic total pumping rate. [Pg.36]

Another dimensionless group, analogous to the specific speed, that relates directly to the cavitation characteristics of the pump is the suction specific speed, Nss  [Pg.250]

RAQML VRNt FI LD fHANC IS-S fl H EJELD M 0- lOM fl -0 4II4L-F10 FlftD [Pg.251]

VamtLco in itnpcllor prcfllti with speed und uppraxim lc ratnje of ap uific for the vwicufl typer [Pg.251]

Straight-vane, single-suction closed impeller. (Worthington Pump, Inc.) [Pg.251]

Similar to the concept of the specific speed, a suction specific speed, S, is defined as... [Pg.291]

Typically, for single-suction pumps, suction-specific speed above 11,000 is considered excellent. Below 7000 is poor and 7000-9000 is of an average design. Similarly, for double-suction pumps, suction-specific speed above 14,000 is considered excellent, below 7000 is poor, and 9000-11,000 is average. [Pg.903]

This operating window is quantified or rated by the term Suction Specific Speed, Nss . The Nss is calculated with three parameters, the speed, the flow rate, and the NPSHr. These numbers come from the pump s performance curve, discussed in Chapter 7. The formula is the following ... [Pg.67]

The operating window is the effective zone around the BH.P on the pump curve that must be respected by the process engineer and/or the operators of the pump. How far away from the BHP a pump can operate on its performance curve without damage is determined bv its impellers suction specific speed. [Pg.70]

Hallam,J. L., Centrifugal Pumps Which Suction Specific Speeds are Acceptable , Hydrocarbon. Processing, 61, No. 4, 1982. [Pg.223]

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. [Pg.476]

For the centrifugal pump, two terms are in common use, the Thoma cavitation number cr and the suction specific speed Sn ... [Pg.507]

Figure 8-6 Effect of suction speed on stable operating window due to recirculation. (Numbers on the curves are the values of the suction specific speed, Nss.) (From Raymer, 1993.)... Figure 8-6 Effect of suction speed on stable operating window due to recirculation. (Numbers on the curves are the values of the suction specific speed, Nss.) (From Raymer, 1993.)...
Centrifugal potting, 16 18 Centrifugal pumps, 19 513 affinity laws related to, 21 63 costs associated with, 21 87 efficiency of, 21 60 nonmetallic, 21 76 suction specific speed of, 21 63 Centrifugal sedimentation, 18 142, 143-144 Centrifugal separation(s), 5 505-551 ... [Pg.158]

Note Suction specific speed derived using cubic meters per second and meters, multiplied by a factor of 51.6, is equal to suction specific speed derived using U.S. gallons per minute and feet. The usual symbol for suction specific speed in US units is S. [Pg.18]

When specified by the purchaser, the pump suction specific speed shall be limited as stated on the data sheet. [Pg.19]

O UTILITY CONDITIONS STEAM DRIVERS HEATING MIN (kPa) (°C) (kPa) (°C) MAX (kPa) C) (kPa) (° C) ELECTRICITY DRIVERS HEATING CONTROL SHUTDOWN VOLTAGE n PREFERRED OPERATING REGION TO (m /h) ALLOWABLE OPERATING REGION TO (m /h) MAX HEAD RATED IMPELLER (m) MAX POWER RATED IMPELLER (kW) NPSH REQUIRED AT RATED CAP (m) (2.1.8) O SUCTION SPECIFIC SPEED (2.1.9)... [Pg.83]

Limitation on suction specific speed (see data sheets). ... [Pg.169]

A148 Suction specific speed SP SPEED N 13 metric units (see paragraph 1.4.42)... [Pg.183]

Another parameter that helps in evaluating the pump suction limitations, such as cavitation, is suction-specific speed. [Pg.34]

Annex A specifies calculations for specific speed and suction specific speed. [Pg.10]

NOTE Impellers made as forgings or fabrications have machined waterways, w hich may offer improved performance for low suction specific speed designs. [Pg.45]

The vendor shall provide complete performance curves, including differential head, efficiency, water NPSHR, and power expressed as functions of flowrate. Except for low specific speed designs where it would not be feasible, the curves shall be extended to at least 120 % of flowrate at peak efficiency, and the rated operating point shail be indicated. The head curve for maximum and minimum impeller diameters shall be included. The impeller identification number, specific speed and suction specific speed shall be shown on the curves. If applicable, the curves shall indicate viscosity corrections. Minimum flow (both thermal and stable), preferred and allowable operating regions, and any limitations of operation shall be indicated. [Pg.103]

See other pages where Suction specific speed is mentioned: [Pg.290]    [Pg.291]    [Pg.303]    [Pg.303]    [Pg.66]    [Pg.223]    [Pg.479]    [Pg.223]    [Pg.250]    [Pg.250]    [Pg.265]    [Pg.266]    [Pg.774]    [Pg.897]    [Pg.17]    [Pg.18]    [Pg.19]    [Pg.32]    [Pg.68]    [Pg.89]    [Pg.19]    [Pg.29]    [Pg.52]   


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