Just upstream of the desulphurizing vessel(s), the installation requires a small inlet separator with a coalescing filter to remove excess liquids from the gas. Care should be taken to insulate the lines and the vessel(s) to prevent a temperature drop of no more than 5° F (–15° C) after the last liquid separator across the outlet of the vessel. The actual design of the vessel(s) can be customized to specific site needs based on inlet gas flow, operating pressure, desired pressure drop, and the days-to-outlet-H2S specification.Low predictable pressure drops, as low as a few inches of water, allow a wide range of reliable applications and equipment configurations. Properly constructed vessels should last 20 years or more. Site facilities should include the appropriate piping to and from the desulphurizing vessel and vessel support. Insulation of the piping and vessel may be required, depending upon the degree of atmospheric cooling anticipated. Optional equipment may include a water-spray system to saturate the inlet gas. System and internal vessel design specifications, and vessel fabrication and installation assistance is available from the CAVALCO OMG representative given site-specific information.