Established in 1973, Hydraulic Analysis Limited (HAL) are the world leader in pipeline hydraulic modelling and surge analysis in the water, oil, gas and energy industries. Since our foundation, we have undertaken over 12,000 pipeline hydraulic design studies in more than 60 countries, supported by a number of regional offices. We now also install our pipeline simulation software (VariSim) in control centres around the world to allow the hydraulic models to run live, for leak detection, optimisation, energy saving, fault diagnosis and water quality monitoring, including through web browsers. These are known as ‘real-time’ systems in the pipeline industry.