Friday, November 30, 2012

Piping Design - Pipe Rating Classifications

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It is usual industry practice to classify the pipe in accordance with the pressure-temperature rating system used for classifying flanges. However, it is not essential that piping be classified as Class 150, 300, 400, 600, 900, 1500, and 2500. The piping rating must be governed by the pressure-temperature rating of the weakest pressure containing item in the piping. The weakest item in a piping system may be a fitting made of weaker material or rated lower due to design and other considerations.

Sunday, November 25, 2012

Piping Design - Stream Traps and its Types

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The function of a steam trap is to discharge condensate from steam piping or steam heating equipment without permitting live steam to escape. Some principal types of steam traps are:

  • Float
  • Thermostatic
  • Thermodynamic
  • Inverted bucket

The float type (FIGURE 1) consists of a chamber containing a float-and-arm mechanism which modulates the position of a discharge valve. As the level of condensate in the trap rises, the valve is opened to emit the condensate. This type of valve tends to discharge a steady stream of liquid since the valve position is proportional to the rate of incoming condensate. Because the discharge valve is below the waterline, float-type steam FIGURE 2 Float steam trap. (Spirax traps must employ a venting system to Sarco Inc.) discharge non-condensible gases. This is generally accomplished with a thermostatic element which opens a valve when cooler non-condensible gases are present but closes the valve in the presence of hotter steam. 

Friday, November 23, 2012

Material Selection - Piping Design

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Material Selection

Key Considerations

  • Material specification
  • Chemical Composition
  • Mechanical Properties
  • Brittle fracture toughness
  • Carbon equivalent
  • Inspection
  • Repair
  • Welding Procedure

Saturday, November 17, 2012

List of Free Magazines Subscriptions Offers and Ebooks Downloads

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To make our readers happy, we are able to offer our feed readers and regular readers on website freebies like Magazines (Online and Print Edition) and lots of Free and legal E-book which anyone can freely distribute.

 

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