intro to pump

7/27/2019 Intro to PUMP

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Copyright - SFASoftware LLC 20072007 International Pump User Symposium 1

By Robert X. Perez and Bill Stark, PumpCalcs.com

Sponsored by


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WhoPumpCalcs is a joint venture between Pumps & SystemsMagazine and SFASoft LLC
http://www.pump-zone.com/index.phphttp://sfasoft.com/


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WhatPumpCalcs is a free, online calculation site targeted toassist engineering, operations, and maintenanceprofessionals dealing with pumping systems andpumping machinery.

Calculator topics:Centrifugal pumpsPD pumpsPressure, head, and flowVibrationMany more


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When and Where PumpCalcs is available 24/7, on any computer withinternet access

Simply go to the Pumps & Systems website,pump-zone.com , and click on the Pumpcalcs.Com link:


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Why One word: Time .

PumpCalcs is a fast way to arrive at useful, meaningfulanalysis results with the option of sharing your results

with coworkers and saving the output for later reference.


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Three Calculator Choices

Unit Converter: Easy-to-use converter allows you toquickly convert from one type of engineering unit toanother.

Basic Calculators: Simple equations that can besolved explicitly for all variables.

Expert Calculators:

Guide the user to conclusions or recommendations

using built-in logical statements based on industryexperience and/or

Have multiple results, numerical and logical.


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Unit Converter Example

Unit Converter: Easy-to-use converter allowsyou to quickly convert from one type of units to another.

Convert 45 lbs to kilograms 20.41 kgs

Convert 100 psi to pascals 689475.73 Pa

Convert 500 Newton-meters to ft-lbs 368.78 N-m


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Basic Calculator Examples

Basic Calculators:

Example #1 You want to know how muchhorsepower will be needed for the following pumpconditions:

500 gpm, 200 ft of head, s.g. = .90, and efficiency of 68%. To answer this question go to basicscalculator and select Brake Horsepower.

After entering the data and pressing the Solvebutton, you get an answer of 33.422 hp.


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Basic Calculator Examples

Basic Calculators:

Example #1 METRIC You want to know how muchhorsepower will be needed for the followingconditions:

500 barrels per minute, 200 meters of head, s.g. =.90, and efficiency of 68%.

After modifying the input data and pressing the Solvebutton again, you get 4605.457 hp.


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Expert Example # 1

Expert Calculators:

We will use the, Centrifugal Pump Analysis Expert Calculator from the home page.

All Expert Calculators have tabs for:Overview

Assumptions

ExamplesReferences

Below these tabs are the data input fields


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Expert Example # 1

Expert calculators (continued)


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Expert Example # 1

Centrifugal Pump Analysis Output:TDH = 590

Ns = 850

Nss = 11,651Impeller Diameter = 12.6667 inches

BHP = 165 hp

Note: After clicking the eff. versus Ns link, you see thatefficiency should be 74% instead of 65%. This meansyou should redo the analysis using the new value for efficiency.


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Expert Example # 1

After changing efficiency to 74%, rerun theanalysis.

Centrifugal Pump Analysis Output :

TDH = 590

Ns = 850

Nss = 11,651 (This is too high)

Impeller Diameter = 12.6667 inches

BHP = 145 hp (Due to higher efficiency)

Eff. = 74% instead of 65%


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Expert Example # 1

Change the NPSHa value to 25 ft to lower the Nss. After rerunning the analysis, we get:

TDH = 590

Ns = 850Nss = 9695 (This is acceptable)

Impeller Diameter = 12.6667 inches

BHP = 145 hp (Due to higher efficiency)

Eff. = 74%


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Expert Example # 2

Expert Calculators:

We will use the Conductor Sizing ExpertCalculator from the home page to determine therequired conductor size for a 75 HP, 460 VAC,

96 Amps, 3 Phase motor.

Adjustments for ambient temperature and parallelconductors can be made along with cable andbreaker types.

Results:1 AWG rate for up to 120 Amperes.


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Closing Comments

PumpCalcs is designed to save pump selectors andusers time.

We want you to encourage your colleagues to use thesite.

New content will be added continually.

We encourage the pump community to support the sitethrough:

Frequent use of the calculators.Submissions of calculators, examples, and improvementideas.


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QUESTIONS?

By Robert X. Perez and Bill Stark, PumpCalcs.com

Sponsored by

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