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Heat Exchanger Design in PV Elite

 

A fixed tubesheet heat exchanger modeled in PVElite

PVElite performs the mechanical design of heat exchangers in accordance with the following Codes:

  • ASME Section VIII Division 1 (part UHX, formerly App. AA) code
  • TEMA standard
  • PD 5500 (formerly BS5500, British standard)

Fixed Tubesheet Capabilities

Fixed Tubesheet Exchanger with an Expansion Joint

  • Fixed Tubesheet can be designed per ASME, PD5500 and TEMA codes.
  • Plain Shells, and Shell with Expansion joints or Bellows can be modeled.
  • Stress due to differential thermal expansion of tubes and shell is computed.
  • Flanged and Flued (thick) Expansion Joint can be designed per TEMA and ASME.

U-tube Tubesheet Capabilities

A U-tube tubesheet exchanger, tubesheet integral on both sides

  • U-Tube exchangers can be designed per ASME, PD5500 and TEMA codes.

Floating Tubesheet Capabilities

A Floating tubesheet exchanger with a floating head and backing ring

  • Floating Exchangers can be designed per ASME, PD5500 and TEMA codes. e.g. packed, sealed etc.
  • Floating head covers can also be designed per ASME and PD5500. 
  • Stress due to differential thermal expansion of tubes and shell is computed.

General Tubesheet Capabilities

Moment from bolting of the Tubesheets to the shell/channel flanges is considered in the design.

Tube-Tubesheet joint is checked per ASME App-A and part UHX, and PD5500.  Tube-Tubesheet weld can also checked per ASME.

PVElite computes the stress at the actual tubesheet thickness and the required tubesheet thickness for given loading.  Where required it calculates the shell/channel stresses. If an expansion joint is specified (for a fixed tubesheet) then its spring rate and stresses are also computed and the spring rate is considered . 

There is an option to specify up to 8 different load cases at one time.  These load cases can have different design temperatures, mean metal temperatures, pressures etc. User can also override the material properties such as coefficient of thermal expansion and Young's modulus.


Integrated Heat Exchanger Design

In program versions before 2004, the heat exchanger components such tubesheets, expansion joints and floating heads could only be analyzed in the Component Analysis module (CodeCalc) of PVElite. Although this facility is still available, additionally in version 2004, these components can be analyzed in the same model.  This new feature has a number of advantages not formerly available. Among these advantages are:

  • Tubesheet can be integrated into a model, including cylindrical shells (main shell and channels), heads, and nozzles in the same model.
  • The total weight of the heat exchanger can be computed including all of its major component parts (tubesheet, tube bundle).
  • Supports, such as saddles, can be analyzed directly from the integrated model, ensuring that all the weights and applied loads are catered for.
  • The tubesheet reports are part of the overall analysis.
  • The tubesheet design code can be changed between TEMA and ASME with little modification to the input.