I D
× COMMENTARYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chemical Engineering MagazineChementator Briefs
Solar desalination Researchers at Rice University (Houston, Tex.; www.rice.edu) working…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILESOLIDS PROCESSINGEQUIPMENT & SERVICESFOCUSNEW PRODUCTS + Show More

Comment

Letters

By Chemical Engineering |

Pump Safety: Flirting With Disaster

I just finished reading your article (Pump Safety: Flirting With Disaster, pp. 67–70, December 2016) and want to indicate the following:

In the third example, the text said that the HBEP/HSO is 0.7, but in the formula, 0.75, (0.75–1) is written as the divisor. With 0.7, the relation QSO/QBEP is 0.166666, which is less than the stated 0.20.

By the way, I found the article very interesting.

Ernesto Calderón
Head of Design Process Engineering, Techint 

Author’s response

Mr. Calderón is correct. He must have read the article very carefully to glean that, in Example 3, I stated that HBEP/HSO was 0.7, but inserted a value of 0.75 into the calculation. With the correct value (0.7), you get a
QSO/QBEP ratio of 0.166666, which is lower than the value of 0.20 that I stated.

 We need to thank Mr. Calderon for identifying the error in my calculations and then calculating the correct value for the QSO/QBEP ratio.

Robert Perez

Editor’s note: The correction to Example 3 as stated above has been included in the online version of this article: www.chemengonline.com/pump-safety-flirting-disaster

 

Re-Establishing Course 

Your article in the November 2016 edition of Chemical Engineering was excellent (Re-Establishing Course, pp 67–70; www.chemengonline.com/re-establishing-course). There is so much pertinent information, very to the point and written from your [the authors] personal experience — not by some person just “imagining” what the situation of having to re-establish course would be like. There is nothing like first-hand knowledge to give weight to a story. 

I am retired and not in a position of looking for employment, although I have had a few part- and full-time jobs that needed my area of expertise. I read the story because it sounded interesting and the further I got, the more it made an impression on me. If I were in a position of needed to “start over,” I would have your story as my main guide. Thank you very much. 

Brian T. Bender
Napa, California

 

Related Content
Letters
Atmospheric Storage Tanks This refers to the [Engineering Practice] article “Designing Atmospheric Storage Tanks” [March 2017, pp. 77–82]. It is…
Letters
Control Engineering for Chemical Engineers The March 2017 Chemical Engineering issue features the article “Control Engineering for Chemical Engineers” [pp.…
Letters
Steam Concepts I enjoy reading your magazine and find many of its articles informative and helpful. I noticed several errors…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Quadruple Sensor Lifetime with a Retractable Housing
Minimizing Explosion Risk Where Other Solutions Cannot
Minimizing Corrosion with Fast, Robust Gas Analysis
Lower Measurement Point Costs with Automatic pH Sensor Cleaning
Reduce the Risk of Corrosion in Fertilizer Production

View More

Live chat by BoldChat