Perspectives: Plant InSites

Ease Measurement of Column Internal Flow

Opting for a pump instead of gravity to return liquid to a tower often makes sense

By Andrew Sloley, Contributing Editor

Last month, we looked at using a gravity-flow loop to measure liquid flow inside a column (“Get Some Inside Information[http://goo.gl/CTYvck]”). An often-attractive alternative uses a pump to return the total liquid draw taken from the column. The important engineering fundamentals of this system lie in the pump and control logic.

Read more

More from this perspective...

Title

Keep Bundle Blunders at Bay

Combining air coolers can provide savings but also pose problems.

03/16/2009

Nix Nozzle Nuisances

Avoid flow problems by considering the impact of inlet losses.

05/20/2009

Utility Systems: Don't Rely on Pot Luck

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

06/16/2009

View Data from a Different Perspective

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

07/23/2009

Cut Pump Speed to Cut Problems

Lower rpm can translate into higher reliability.

08/10/2009

Will You Really Realize Energy Savings?

Heat integration may deliver complications instead of expected benefits.

09/10/2009

Plant InSites: Don’t Make Problems for Your Plant

Local fabrication may seem attractive but can degrade performance.

10/22/2009

Assess the Gravity of the Situation

Flow systems without pumps demand particular attention.

11/09/2009

Plant InSites: Come Up With a Solid Estimate

Use geometry to figure out the amount of material in storage or equipment.

12/14/2009

Take a Load Off Loading

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

01/11/2010

Check What You're Ordering

A mistake on a purchase order can buy trouble.

02/04/2010

Improve Your Plant's Prospects

Keep economics and the lifecycle stage of a facility in mind .

03/04/2010

How Important is Piping Symmetry?

Designers should consider the impact of unequal flows in branches.

04/05/2010

Properly Trigger Standby Pumps

A pressure signal works for many but not all situations.

05/06/2010

Software: Show Some Skepticism

Calculated results require critical analysis.

06/14/2010

Rethink Reactor Temperature Control

Cascade strategy offers simplicity and fast response.

07/13/2010

Watch Out for Two-Phase Flow

Process performance can suffer dramatically when a liquid flashes unexpectedly.

08/30/2010

Don't Err With Air-Fin Exchangers

Take considerable care when specifying maximum air temperature.

10/04/2010

Control Challenges Can Pinch Energy Savings

Heat integration can make achieving effective control more difficult.

11/03/2010

Water Heating Raises More Than Temperature

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

01/10/2011