P & I Design Ltd


P & I Design introduces a comprehensive suite of software to provide designers and plant operators with the capability to meet the ever-increasing reporting demands of environmental legislation. Programs are stand-alone with individual report format and User Manuals with supporting documentation and theory.

ENVIRODBASE includes 25 of the most common components used in the batch process industry. Data, when available, includes CAS number, vapour pressure, latent heat, liquid specific heat, occupational exposure limits, odour threshold, flammability, flash point and dielectric constant.

BREAC predicts heat up, boil up, cool down rates and heat removal capability in jacketed stirred batch reactors. Jacket side coefficients are based on heat transfer oil systems or direct steam. The reactor contents are based on non-viscous conditions with a turbine agitator operating at a nominal speed of 90 rpm.

EMISSION predicts volatile component emissions from individual process stages. Emissions may be from displacement, heating or pressure blowdown. Condenser emissions are based on the pure component vapour pressure at the exit temperature.

SCRUBBER predicts the performance of packed wet gas scrubbing columns operating at atmospheric pressure and mass transfer by fast chemical reaction. Gas diffusivity, gas viscosity and allowable scrubber outlet concentrations for common gas phase reaction species are predicted. Designs can be based on a specified pressure drop or % flood.

ADSORB predicts the performance of granular activated carbon fixed bed adsorption columns based on the Freundlich and Yaw isotherms for the recapture of single component VOC streams. Sizing parameters can be adjusted for spare bed capacity.

HDRUM rates and sizes horizontal blowdown drums based on API 520/521 methods.

STACK rates and sizes vertical stacks based on HMIP Technical Guidance Note (Dispersion) D1 methods.

DISPERSE - STACK predicts the short term pollutant concentrations directly downwind of an elevated point source, at specified distances, using dispersion coefficients based on Pasquill-Gifford or McElroy-Pooler as a function of atmospheric stability and wind speed.

DISPERSE - POOLS predicts the short term pollutant ground level concentration directly downwind of a non -spreading, rectangular evaporating pool of volatile liquid using dispersion coefficients based on Pasquill-Gifford or HSE Kinsman as a function of atmospheric stability and wind speed.

EMISSIONS - FUGITIVE estimates emissions from refinery and organic chemicals processes due to equipment leaks using the correlation equation and average emission factor methods.


PUMP sizes and rates centrifugal pumps installed in piping systems handling non-compressible fluids.

USER WORKBOOK provides a facility for adding user component properties and databases.

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