To vent gas from a well or production system. Wells that have been shut in for a period frequently develop a gas cap caused by gas percolating through the fluid column in the wellbore. It is often desirable to remove or vent the free gas before starting well intervention work.

Reducing a larger format to a smaller format. An example of blowing down would be going from Super 16 down to 16 mm.

the removal of makeup water from a cooling tower or evaporative condenser recirculation system to reduce concentrations of dissolved solids

A method of producing a gas/condensate Reservoir

Partial venting or draining, under pressure, of the water side of a boiler to reduce or remove unwanted contaminants. Also the pressure drops after releasing a pressure-relief valve.

boiler water that is removed from the boiler in order to maintain the desired concentration levels of suspended and dissolved solids in the boiler and removal of sludge.

Anything (trees, limbs, brush, etc.) blown down on the trail by the wind.

removal of liquids and/or solids from a process vessel or storage vessel or line by the use of pressure; often used to remove materials which, in high concentrations, could cause damage to the vessel [..]

Reducing a larger format to a smaller format. An example of blowing down would be going from Super 16 down to 16 mm.

A generic engineering term which can be used as noun or verb. A cleaning and/or venting process. Some specific applications: (1) A process for cleaning water-sides of a boiler. A top blow removes scum [..]

The removal of accumulated solids in boilers to prevent plugging of boiler tubes and steam lines. In cooling towers, blowdown is used to reduce the amount of dissolved salts in the recirculated coolin [..]

The use of pressure to remove liquids and/or solids from a vessel.

the water drawn from boiler systems and cold water basins of cooling towers to prevent the buildup of solids.

From time to time natural gas pipelines and other facilities must be depressurized for maintenance or inspection purposes. During depressurization natural gas may be released to atmosphere in a controlled manner from a designated vent point to ensure the pipeline is safely depressurized. Prior to venting to atmosphere the pressure in the pipeline i [..]

A final phase of production from some oil reservoirs that have significant volumes of gas forming a 'cap' which overlies the oil column. During blowdown the wells are recompleted to produce [..]

a method of producing a gas/condensate reservoir by letting the reservoir depressure over time without re-injecting any gas. With this method of production some condensate may condense within the rese [..]

The act of depressurizing process equipment and piping, usually to a vent or flare

1) The emptying or depressurizing of material in a vessel. 2) The material thus discarded.

In connection with boilers or cooling towers, the process of discharging a significant portion of the aqueous solution in order to remove accumulated salts, deposits and other impurities.

(chemical engineering) The removal of liquid and solid hydrocarbons from a refinery vessel by the use of pressure (industrial engineering) Cooling fluid discharged from a plant at the end of its c [..]