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

Workplace Training: Do Your Homework

Evaluate a variety of factors before embarking upon continuing education.

02/25/2014

Will You Really Realize Energy Savings?

Heat integration may deliver complications instead of expected benefits.

09/10/2009

Water Heating Raises More Than Temperature

A key tradeoff complicates the choice between steam and hot oil systems.

01/10/2011

Watch Out for Two-Phase Flow

Process performance can suffer dramatically when a liquid flashes unexpectedly.

08/30/2010

Watch Out For Dead-Legs

Lack of flow doesn't mean lack of problems.

09/27/2011

View Data from a Different Perspective

Re-plotting by flipping the parametric lines can provide important insights.

07/23/2009

Vacuum System Fix Fizzles

Use of scavenged equipment leads to problems.

03/07/2012

Utility Systems: Don't Rely on Pot Luck

Paying attention to the condensate system can keep you out of hot water.

06/16/2009

Use water to check vessel integrity

Hydrostatic testing offers advantages but requires care

06/25/2008

Understand the cold facts about subcooling

Systems sometimes can surmount major layout errors

06/04/2008

Understand and Control Hot Vapor Bypass

Contributing Editor Andrew Sloley says pressure control technique works well if implemented properly, in this month's Plant InSites column.

01/08/2007

Troubleshooting: Take to the Field

Troubleshooting demands getting into the plant to inspect units.

01/30/2009

Think Straight About Orifice Plates

Insufficient flow conditioning often undermines measurement accuracy.

05/21/2013

Teaming two solutions can be counterproductive

Sometimes things just don’t add up as expected. Andrew Sloley discusses how sometimes two solutions aren't always better than one solution.

06/06/2007

Take the pressure off pressure control

Linkage of other variables can stymie hot vapor bypass schemes, according to Andrew Sloley's Plant InSites column.

02/19/2007

Take a Load Off Loading

Some pipelines may benefit from more than "optimum" insulation.

01/11/2010

Take a Different Look at Centrifugal Pumps

An unconventional assessment can provide insights for effective control.

07/25/2011

Take Control Down a Level

Sometimes you can design out the need for instrumentation.

02/23/2009

Tackle Tray Trade-Offs

Find the right compromise between process and mechanical requirements.

10/26/2011

Tackle Tough Services for Centrifugal Pumps with Care

03/11/2004