Pump Calculations

<Security Level 2>

Toyo Engineering India Ltd. 2008

Piping Pressure Drop &

Pump Design Calculations(PUMPCALC_2.0E)

<Security Level 2>


Introduction

This pump hydraulics calculation sheet is used to decide the required performance of pump i.e. Head, NPSH, estimated shut-off pressure, estimated power consumption and the optimum line size.

Hydraulic calculations are done automatically.

Pipe dimensional data as per ANSI/ ASME and JIS is available.

<Security Level 2>


Introduction

This Microsoft Excel Tool includes:

- User Guide

- Calculation Sheet Form

- Data Input/Calculation Sheet

- Pipe Dimensional Data as per ANSI/ASME

- Pipe Dimensional Data as per JIS

<Security Level 2>


It is recommended to save the file without “Guide” and “Form” to minimize the volume of the file and to keep the original file as original.

User should draw process flow sketch.

Data should be entered in white cells only.

<Security Level 2>


How to use

<Security Level 2>


Calculation SheetTitle In addition to general information (like Client,

Plant/ unit name, Work No.), Item No., Type of pump, No. of pumps in working mode as well as in standby mode are to be specified.

Flow A simplified process flow sketch can be drawn in this section.

<Security Level 2>


Process Flow Sketch

U-GA106A,B

U-FA104

U-DC101

U-FA105

NPSH

Suc. Press.

Dis. Press.

Head, BHP

Shut-off Press.

<Security Level 2>


Flow: Pump Description / Name to be indicated in service

Suction Drum: Suction vessel tag no. to be indicated

Minimum suction pressure and Maximum suction pressure to be considered for shut-off pressure should be given.

Minimum Liquid Level and Maximum Liquid Level in Suction drum based on vessel data sheet.

Discharge Side: Destination (such as vessel / column no. or BL) and the required Pressure at destination to be mentioned.

<Security Level 2>


Operating Conditions

Temperature, specific gravity, viscosity & vapor pressure data is required for further calculations.

Percentage of Over design is calculated using normal and design capacity of pump.

Hydraulics

It is possible to calculate hydraulics in maximum three divided sections.

Extreme right end column in both suction and discharge side should be used for any configuration.

<Security Level 2>


If two destinations are specified in discharge side, then calculations results are obtained in following manner:

Discharge side Calculated Section1st column From pump to branch

2nd column From branch to destination1

3rd column From branch to destination2

Temperature, Specific gravity, Viscosity and flow rate values should be entered. If values are

unspecified then data given in Pump operating conditions is used for calculations in following

priority order:

Sp.Gr. : Minimum Normal MaximumViscosity: Maximum Normal

Minimum

<Security Level 2>


Similarly, if flow rate value is not specified following default will be used:

Suction side:

For section to MID1(1st column) Pump design capacity X No. of working pumps

For other sections Pump design capacity

Discharge side: Pump normal capacity

For hydraulics calculations Nominal pipe size, wall thickness and pipe ID values are also required.

<Security Level 2>


To enable the use of piping database provided with this sheet enter inch index(”) along with pipe size.

Specify reference standard & schedule number for wall thickness.

1 represents ANSI / ASME

2 represents JIS

Pipe ID is calculated automatically in this case.

If pipe ID is specified directly then values of Reference standard and wall thickness are neglected.

Pipe roughness value is required for pressure drop calculation.

<Security Level 2>


Default value is used if roughness value is not entered.

Roughness: CS 0.004572 mm……………Default SS 0.0015 mm

Equivalent Length: For suction side, input number of fittings

on the cells in Note *4) of this sheet.

Also specify the factor by which calculated Total Equivalent length to be multiplied. For discharge side total equivalent length value

(including actual length) to be given as an input.

<Security Level 2>


Actual pipe length is required for both suction as well as discharge side.

Pressure loss for individual components like strainers, heat exchangers, control valves etc. can be entered.

Using liquid levels and elevation data liquid static head is calculated.

Thus, minimum suction pressure and required maximum discharge pressure resulted from hydraulic calculations are indicated.

If there exists two destinations, then larger required discharge pressure is indicated.

<Security Level 2>


Deviation from this discharge pressure for each destination is also indicated.

Differential Pressure:

Based on results obtained from hydraulic calculations, decide values of suction and discharge pressure.

Once suction and discharge pressure values are entered, head and margin included will be calculated. Net Positive Suction Head (NPSH):

Specific gravity of fluid to be pumped is required for NPSH calculations.

<Security Level 2>


If specific gravity is unspecified here, then its value from ‘Pump Operating Conditions’ will be considered

in following priority order:

Minimum Normal Maximum

NPSH available (NPSHA) must be greater than NPSH required (NPSHR) by the required margin (for guidelines see GR-TEG1-1211-103).

Break Horsepower (BHP):

Based on data entered and results obtained, estimated pump efficiency is calculated.

<Security Level 2>


Pump efficiency value is required for BHP calculation. If it is not specified, then above estimated value is used by default. If vendor data is already obtained, use vendor’s efficiency.

Maximum shut-off pressure

Using specific gravity value, maximum liquid static head value can be calculated.

Factors for Maximum shut-off pressure calculation must be specified in NOTE *5)

<Security Level 2>


This factor is based on anticipated performance curve.

Usually 1.3 is applied for Shut off pressure calculations.

However, actual shut-off pressure of the selected pump sometimes exceeds that calculated by using factor of 1.3. Thus, final shut-off pressure shall be confirmed with the selected pump vendor’s data.

<Security Level 2>


The pump calculation file “PUMPCALC_2.0E.xls” will be loaded while loading Line sizing program and will be available in the same folder.

This file is to be used for pump hydraulics calculation.

<Security Level 2>


Thank you.

Documents

Pump Calculations