iMAASP (Maximum Allowable Annulus Surface Pressure) Calculator

iMAASP is a calculation tool used to run up to four MAASP (Maximum Allowable Annulus Surface Pressure) calculations at any one time, providing the details of the MAASP value for the current status of the well using the derated wellhead pressure resistance and the wall thickness loss in any string and identifying the annulus element with the minimum pressure rating, i.e. the component most likely to fail first.


The iMAASP calculation utilises tri-axial stress analysis and takes into account a wide range of inputs, such as the axial load on tubulars (which impacts their collapse/burst resistance) and temperature de-rating of material properties. The iMAASP calculations in operational wells also considers the impact of reduced wall thickness in tubulars arising from wear, corrosion or erosion.

The technical background to the iMAASP calculation is embodied in ISO16530-2 (Annex K).


iMAASP The software is available as a stand-alone PC version for single users.


iMAASP is fully supported. Licensees receive regular updates, including further functionality improvements and have the benefit of expert technical support.

Key benefits

  • IMAASP software allows users to test annuli configurations and equipment to help program and provide safer well operations in any annulus conditions
  • Mitigates risk of reaching annulus loading conditions that can surpass the available pressure capacity of the annulus components
  • Save file feature allows users to quickly adjust for differences from well to well
  • Calculations reflect the industry best practice and meet ISO16530-2 Annex K methodology.

Get the Trial version of iMAASP Professional Edition

Download iMAASP Professional Edition Trial today.