Our Metal Expansion joints design software is a comprehensive product which requires very little human interface for design of metal expansion joints.

All calculations right from number of convolutions, width, fatigue life cycle, stress, weight, movement calculations, tie-rod, sleeve, shroud, end pipe length and vibration calculations are done automatically.

After the calculations SPULLOWS also generates a manufacturing drawing in ACAD or any other 2D drafting software of the bellows with assembly and child part drawing along with BOM (Bill of Materials), Standards / Schedules used, a 3D model, and costing sheet. All these outputs are generated automatically by a click of a button.


  • EJMA/ASME formulas for bellows design.
  • ASME and DIN flange standards.
  • ANSI pipe schedule.

    It is built to Support both IPS (Imperial) and MMKS units. Additional specific units can be added upon request.


    The material options in the software consist of all the standard materials used in manufacture of bellows, like SS, MS, Inconel to just name a few of them. However, the user has an option to add a new material into the database by going to the Admin screen and adding new material. Once a material is added here it becomes a part of the material database and will be reflected in the material drop down menu as well.


  • I.D(nominal bore)
  • Pressure
  • Temperature
  • Material
  • Lateral, axial & angular movement
  • No of Plies
  • Temperature
  • Ply thickness
  • Pitch,Depth of convolution(Optional)
  • On these inputs SPULLOWS calculates the number of convolutions required to satisfy the design as per EJMA standards. The user can select the number of convolutions that he feels is ideal.

       SPULLOWS rechecks the design and let us to do Hardware selection such as
  • Tie rod
  • Bracket
  • Flange
  • End Pipe
  • Sleeve
  • Shroud

  • Fatigue life
  • Thickness (choice)
  • No of convolutions (tool specific)
  • Manufacturing Drawing
  • Sping rate
  • Compressed length
  • Elongated length
  • Total Stroke
  • Maximum internal pressure
  • Maximum external pressure
  • Operating pressure
  • Operating temperature
  • Exposed environment
  • Material (choice)
  • Assembly requirement
  • Free length
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