Mechanical Calculations


  • Determine pump performance on viscous liquid when water performance is known

    Calculation based on Hydraulic Institute Standard, ANSI/HI 9.6.7. Inputs include flow, head, efficiency,speed, best efficiency point head and flow for water along with viscosity value. Outputs include correction factors on head, flow and efficiency and the viscous head and flow.

  • Determine pump performance on water when viscous performance is known

    Calculation based on Hydraulic Institute Standard, ANSI/HI 9.6.7. Inputs include viscous flow, viscous head and viscosity. Outputs include correction factors on head, flow and efficiency and the viscous head and flow.

  • Viscosity Conversions

    Calculation based on Hydraulic Institute Standard, ANSI/HI 9.6.7 Appendix A. Conversions of viscosity units between kinematic viscosity, dynamic viscosity and SSU viscosity units.

  • Pump Design Estimates

    Determine pump estimated design parameters in terms of predicted efficiency, power, motor rating, NPSHR, impeller diameter, nozzle size, weights and dimensions etc.


  • Centrifugal Compressor Estimates

    Determine centrifugal compressor estimated design parameters in terms of frame size, predicted efficiency, absorbed power, driver rating, discharge temperatures, weights and dimensions etc. Calculation uses inputs for gas composition and operating conditions.

  • Air Compressor FAD requirement Calculation

    Determine the free air delivery (FAD) requirement for an air compressor when the normal flow and design ambient air conditions (pressure, temperature, humidity) are known. The FAD calculated can then be used to make a selection from air compressor suppliers catalogue.

Engines, Gas Turbines and Steam Turbine

  • Gas Turbine Deration Calculations

    Estimate the site power of Gas Turbine, if the ISO power and site conditions (including temperature, altitude, humidity, inlet and exhaust losses and fuel type) are known.

  • Steam Turbine Performance Calculations

    Calculate isentropic efficiency of steam turbine using the inlet and outlet steam conditions or vice versa. Either power or mass flow can be used to define turbine parameters.

  • Diesel Engine Fuel Consumption Estimation

    Calculate diesel engine fuel consumption based on estimated specific fuel consumption rates. Use the default/typical value if specific fuel consumption is not known. Stack height due to gas dispersion considerations are to be separately analysed and are therefore not covered under this calculation.


Fired Heaters and Boilers

  • Measurement of Efficiency of Fired Process Heaters (API 560)

    This calculation helps in the measurement of efficiency of fired process heaters. The calculation is currently applicable to gaseous fuel based Fired Heaters. Inputs used are ambient conditions such as temperature and humidity, assumptive radiation losses, flue gas exit temperatures, flue gas oxygen content, fuel gas composition and fuel supply temperatures. Oxygen sampling is supported on 'wet basis' as well as 'dry basis'. Outputs include, Flue gas composition by consituent mass per mass of fuel gas burned, net thermal efficiency, gross thermal efficiency and fuel efficiency.

Pressure Vessels

  • Pressure Vessel Thickness/MAWP/Weight Estimation

    This calculation helps determine the thickness, MAWP and estimated volumes and weight of vessel under internal desgin pressure in accordance with the provisions of ASME Section VIII Div-1. This calculation is intended to be used for estimation and gross evaluation purposes only and not for fabrication purposes.


  • Noise Attenuation with Distance

    Calculate Sound Pressure Level (SPL) at a distance R2 when the sound pressure level at distance R1 is known. The source of sound can be either a point, a line or a planar wall.

  • Common Noise Conversions

    Calculate Sound Pressure Level if Sound Power Level, distance and directivity factor are known.
    Calculate Sound Power Level if Sound Pressure Level, distance and directivity factor are known.
    Calculate distance if Sound Pressure Level, Sound Power Level and directivity factor are known.

  • A-weighting of Noise Spectrum

    Get A-weighted noise spectrum from unfiltered noise spectrum.

  • Background Noise Correction

    Get corrected noise levels from total noise levels and background noise levels. Correction can be performed either on the overall noise levels or on spectrum levels.

  • Noise map due to multiple noise sources

    Get noise levels on a predifined area(grid) due to multiple noise sources located on ground. Inputs include the sound power level, directivity factor and the x & y coordinate locations.

  • Noise Addition

    Perform logarithmic addition of noise levels. Sound pressure levels at a point can be added up using logarithmic addition. Similarly if addition of sound power levels for various octave bands is done, the overall sound power level can be obtained.


  • Emission Measurement Conversions & Corrections

    Convert emissions from ppm units to mg/m3 units, from wet basis to dry basis and perform corrections to reference Oxygen levels from measured Oxygen levels.

  • Combustion and SOx emissions

    Perform combustion calculations with full flexibility. Fuel can be specified in mole percent or in mass percent. Flue gas composition can be obtained, in 'mole per mole of fuel' or in 'kg per kg of fuel'. The calculations also calculate the SOx emissions in the required units, while correcting for moisture and oxygen levels. The program also provides the flexibility to set the standard conditions for reporting of emission levels if 'mg/Sm3' are chosen as the emission units.



  • Humid Air Properties

    Input Air Dry Bulb temperature, temperature and either of wet bulb, dew point, humidity ratio or enthalphy to obtain thermophysical properties of humid air.

Fluid Mechanics