Perspectives: Plant InSites

Pumps: Handle More Flow

Success often depends upon lowering head losses or raising pump pressure

By Andrew Sloley, Contributing Editor

Straightforward hydraulic systems follow simple rules. For non-Newtonian and incompressible fluids, flow and net pressure drop are directly related. Consider the water transfer system shown in *Figure 1*. Wastewater generated in Unit 1 is stored in tank T1. Some of the water is reused in Unit 2. The remaining wastewater goes to treatment via vessel V1 in Unit 2. When Unit 2 isn’t running, centrifugal pump P1 provides the head for transferring the water from tank T1 to vessel V1.

Read more

More from this perspective...

Title

Don't Calculate Pressure Drops in a Vacuum

Consider flow regime boundaries and the limitations of methods.

06/08/2011

Do some heavy thinking about light loads

Cutting steam demand can get you into hot water, advises Contributing Editor Andrew W. Sloley, contributing editor, in this month's Plant InSites column.

10/01/2007

Do Liquid Injection Right

A variety of factors influence performance.

01/05/2012

Distillation Columns: Get Some Inside Information

A gravity-flow loop can enable measuring internal liquid flow in a column

07/22/2014

Distill Your Internals Choice

Some general guidelines can ease the selection process.

09/01/2011

Cut Pump Speed to Cut Problems

Lower rpm can translate into higher reliability.

08/10/2009

Correct those disturbing lapses

Keeping liquid in a reflux drum still can prevent problems, says Andrew Sloley, in this month's Plant InSites column.

08/31/2007

Control Challenges Can Pinch Energy Savings

Heat integration can make achieving effective control more difficult.

11/03/2010

Consider VFDs for Centrifugal Pumps

Such drives may provide energy savings and avoid operating problems.

03/12/2014

Consider More Than Static Mixers

A number of technologies can handle pipeline mixing.

01/31/2011

Consider Compact Reboilers

Several types of heat exchangers can save space

07/24/2012

Consider "Pasteurizing" Your Column

A side-draw may cut capital and energy costs for distillation.

02/12/2013

Column configuration can cripple performance

The importance of having the inherent capability to meet operating requirements and enable proper instrumentation performance is stressed by Contributing Editor Andrew Sloley.

09/21/2006

Choose the Correct Condenser

Consider a variety of factors when selecting a unit.

02/10/2014

Check What You're Ordering

A mistake on a purchase order can buy trouble.

02/04/2010

Centrifugal Pumps: Fight Flow Recirculation

But first understand why the phenomenon occurs in centrifugal pumps.

04/17/2014

Centrifugal Pumps: Avoid Surprises When Cutting Impellers

Predicting resulting centrifugal pump performance demands care

01/15/2014

Carefully check vendor references

Determine the differences between a cited installation and yours, Andrew Sloley, contributing editor, says in this month's Plant InSites column.

10/30/2007

Can you trust your sight glasses?

Sight glasses are invaluable for troubleshooting towers and checking instruments. Improper connections can take a toll on accuracy.

02/17/2006

Baffles Needn't Be Baffling

Clear criteria determine their design for drums to separate three phases.

08/19/2013