Whether operating at high pressures, dealing with liquids of low density, viscosity and surface tension, or attempting to satisfy a requirement for a high turndown ratio, it is difficult to separate the smallest droplets from the gas stream, since the velocity required to separate these small droplets may be higher than the critical liquid velocity above which re-entrainment will occur. In this operational situation, it is common to install a pre-conditioner or coalescing device upstream of the demister.

We offer two different types of gas/liquid coalescing device, referred to as Mesh Type and Vane Type systems.

Installed as a coalescing device, both the Mesh Type and Vane Type systems are designed to operate at approximately three times the normal design velocity, when compared to the situation if used as a demisting device. In this capacity, they operate in a flooded condition, which has the effect of enlarging the sizes of the liquid droplets within the device. Since the droplet sizes are larger after passing through the pre-conditioner, they become easier to separate in the downstream demisting device and the gas/liquid separation efficiency is improved substantially. 

Advantages 
·Provide coalescence of the liquid droplets prior to engagement on the demisting device, substantially increasing the efficiency of the demisting system
·Provide a pressure drop upstream of the demisting device, so that flow velocity variations (i.e. mal-distribution) are reduced across the frontal area of the demisting device, thereby increasing the separation efficiency
·Ensure that the separator has a high turndown ratio ≥ 10:1.

Advanced Gas / Liquid Coalescers
·Mesh Type coalescing device
·Vane Type coalescing device