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

Nix Nozzle Nuisances

Avoid flow problems by considering the impact of inlet losses.

05/20/2009

Keep Bundle Blunders at Bay

Combining air coolers can provide savings but also pose problems.

03/16/2009

Take Control Down a Level

Sometimes you can design out the need for instrumentation.

02/23/2009

Troubleshooting: Take to the Field

Troubleshooting demands getting into the plant to inspect units.

01/30/2009

Steam Systems: Simple Solutions Can Prompt Complex Problems

Steam systems are especially susceptible to developing difficulties

12/23/2008

Stripper Bares All

Analysis reveals how operating practices compounded design mistakes

11/21/2008

Full Vacuum Rating Isn't an Empty Benefit

It often can provide important but underappreciated advantages for vessels

10/16/2008

Plant InSites: Look Beyond the Lore

Don’t rely on recollections about how a unit had performed

10/10/2008

Right Vacuum Control Choice Takes the Pressure Off

Choosing the proper recycle stream for regulation is crucial

08/07/2008

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

Plant InSites: Cast a cold eye on columns

Subcooling can complicate and compromise tower performance

05/23/2008

Don’t stack the deck against yourself

Always consider future expansions before finalizing layouts

03/14/2008

Keep parallel pumps in line

Mind the curves when using different size pumps.

02/13/2008

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

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

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

Don’t look at precondensers in a vacuum

Consider the impact of the downstream vacuum ejector on precondenser performance, advises Andrew Sloley, in this month's Plant InSites column.

08/20/2007

Properly protect centrifugal pumps

Consider various factors when selecting how to guard against low flow, Andrew Sloley says in this month's Plant Insites column.

07/11/2007

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