In 99 out of 100 cases COMPRESSING GAS UP-STREAM of facilities (pipelines) rather than down-stream is more economic, i.e., it requires less compression power. Expensive off-shore compression or planological reasons may reverse this statement.

GLYCOL DEHYDRATION AT LOW PRESSURE (sometimes considered in cases where CO2 can cause corrosion in plant equipment) is uneconomic as column sizes become very large. Pressures between 30 and 70 bar seem optimum. Also water content at low pressures is factors higher than at high pressures.

WATCH YOUR RECYCLES when you process gas that is relatively rich in heavy hydrocarbons!!! Condensate streams obtained after compression and cooling of gas that are returned to up-stream separators can cause large recycles and consequently increased cooling and compression power requirements. Consider stabilisation of condensates instead.

Sometimes RECYCLES ARE A BIG HELP in those cases where liquid recovery from relatively lean gases is wanted. Namely recovery of liquids from rich gases is not only higher because the % of heavies is higher but also because the percentage recovery is higher at the same processing temperature and pressure. Therefore consider heavy-ing-up the gas by recycling condensate.