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Improve the security and performance of your plant with alarm management, performance supervision, asset supervision, web-based data visualisation, optimisation, advanced control, and tuning with the new TaiJi tool.

Rethink your working methods and obtain immediate results thanks to our services, trainings, and consulting expertise. Manage changes intelligently with our proven solutions.

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April 2006

In this issue

puce Classes and seminars
puce Articles
puce Trade shows and conferences
puce Trick of the month
puce To contact us



Coming classes and seminars

PID Loop Tuning
April 6, Ottawa, ON
May 8, Milwaukee, WI

Analytical methods for troubleshooting and Control loop tuning
May 16-18, Dalhousie, NB, English course(Question period bilingual)
May 23-25, Cincinati, OH

Detailed Loop Analysis with ExperTune
May 9-11, Milwaukee, WI
June 12-14, Milwaukee, WI

ExperTune Advanced Tools
June 14-16, Milwaukee, WI

See our calendar for 2006

Articles

Performance and Optimization - An Economic Point of View,
March issue of « ISA NewsLetter Management Division »: an article on performance.
Click here to read the article.

Using Performance Monitoring and Optimization Tools for a Paper Machine Start-up,
March issue of « Pulp and Paper Canada », an article written by Jean-Guy Lagacé from Kruger Wayagamack and Serge Naud and Michel Ruel from Top Control.


Trade Shows

ISA Edmonton:
Top Control will be at ISA Edmonton, April 5-6, 2006 (Booth 78). Come and see us!
Conferences
Wednesday, April 5th, 2006, 10:30 AM - 11:15 AM
            Managing Assets Using Performance Supervision
            Michel Ruel, Top Control

Thursday, April 6th, 2006, 11:15 PM - 12:00 PM
            Quick Start-up Loop Tuning & Subsequent Remote Monitoring
            Jean-François Dubé, Top Control

For more informations about ISA Edmonton please click here.


Trick of the month : Pumps and Flow!

Centrifugical Pump shut off pressure

  • At 1800 rpm (95% of motors), Max Head pressure (ft) ~ [impeller diameter(in)]2
    See
    Ex: A 9in impeller will generate a pressure of 81 ft.

Pump best operating point

  • At 85% of shut off pressure (>90% of cases)
    P(ft) ~ 0.85 * [D(in)]2 1 PSI = 2.31 ft H2O

  • Ex: A 9in impeller will generate a shut-off pressure of 81 ft.
    Hence it should operate at 69 ft or 30 PSI

Pump and VSD

  • Flow speed F2 = F1 * (S2/S1)
    Pres (Head) speed2 P2 = P1 * (S2/S1)2
    HP (Power) speed3 HP2 = HP1* (S2/S1)3
  • If power is proportional to speed*speed*speed,
    hence doubling the speed will increase by a factor of 8 the burden:
    • maintenance,
    • wear,
    • vibration,
    • ...

Pump and HP

  • Power (HP) = F(usgpm)* P (PSI)* S.G. /1717
    Ex: 1 usgpm water at 1717 PSI -> 1HP (hydraulic)
    Ex: 171 usgpm water at 10 PSI -> 1HP (hydraulic)
  • Usually, to include motor efficiency, we use :
    Power (HP) = F (usgpm)* P (PSI)* S.G. /1500 (87.5% efficiency)
    Ex: 1 usgpm water at 1500 PSI -> 1HP (electric)
    Ex: 150 usgpm water at 10 PSI -> 1HP (electric)

Conclusion
Use these simple rules to quickly obtain estimates.

Note
When verifying pressure, never read pressure from installed pressure gauges, use a new one! An old gauge has been exposed to a lot of vibration and could be (probably be) inaccurate.


To contact us

puce Lévis's office +1 (418)834-4321
puce Pointe-Claire's office +1 (514)695-3492
puce Hartland's office (877)867-6473
puce Toll free (877)867-6473
puce Email info@topcontrol.com