Browsing All Posts By William Forsthoffer

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  Auxiliaries

  How centrifugal pumps respond to process requirements

  Centrifugal pumps increase the pressure of the liquid by using rotating blades to increase the velocity of a liquid and then reduce the velocity of the liquid in ...

  On November 25, 2019 / By William Forsthoffer
• Auxiliaries

  Dry gas seal types for low and high pressure applications

  In order to assure the safety and reliability of gas seals, the system must be properly specified and designed. Listed below are typical gas seal system applications in ...

  On November 23, 2019 / By William Forsthoffer
• Auxiliaries

  Optimizing seal oil system safety and reliability

  by Michael S and William E Forsthoffer Check your plant machinery asset list and see how many compressor seal oil systems there are.  Then, compare the availability or ...

  On July 3, 2019 / By William Forsthoffer
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  Auxiliaries

  Tandem seal for dry gas applications

  Gas from the compressor discharge enters the port closest to the compressor (labyrinth end) and the majority of the gas enters the compressor thru this labyrinth. To assure ...

  On June 30, 2019 / By William Forsthoffer
• Auxiliaries

  Is your pre-startup flushing acceptable?

  One of the most important pre-start-up operations for an auxiliary system is flushing. The object of flushing is to render the entire auxiliary system free of excessive particles ...

  On September 18, 2017 / By William Forsthoffer
• Compressors

  Open and closed compressor impellers

  Some open impellers can operate at higher tip speeds, and thus produce greater head than closed impellers. Open impellers can produce approximately 4,500 – 7,500 m-kg force/kg mass ...

  On September 15, 2017 / By William Forsthoffer
• Auxiliaries

  The seal housing system

  The seal oil system of a centrifugal compressor shown can be divided into four major sub-system: The supply syste, the seal housing system, the atmospheric drain system, and ...

  On September 10, 2017 / By William Forsthoffer
• Pumps

  The limits of the centrifugal pump curve

  The centrifugal pump curve has high and low flow limits, which can cause significant mechanical damage to the pump if not avoided. At the low flow end of ...

  On August 26, 2017 / By William Forsthoffer
• Auxiliaries

  Pusher vs. non-pusher

  Mechanical seals are typically categorized into two major types; pusher and non-pusher. A pusher-type seal consists of a primary sealing ring assembled with an ‘O’ ring and springs ...

  On August 25, 2017 / By William Forsthoffer
• Auxiliaries

  Accumulators: Definition and operation

  An accumulator is simply a vessel which compensates for rapid shirt term flow disturbances in the auxiliary system. Most accumulators contain bladders. It is important to remember that ...

  On August 20, 2017 / By William Forsthoffer