Depressurization


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Depressurization

A condition that occurs when the air pressure inside a structure is lower that the air pressure outdoors. Depressurization can occur when household appliances that consume or exhaust house air, such as fireplaces or furnaces, are not supplied with enough makeup air. Radon may be drawn into a house more rapidly under depressurized conditions. Backdrafting of furnaces and vented appliances can also occur with depressurization, introducing exhaust gases into the house.
References in periodicals archive ?
BLOWDOWN has been used in hundreds of studies in oil and gas and chemical companies to model depressurization in process plants.
Pressurization testing typically yields marginally higher leakage rates than depressurization (see pressurization and depressurization results in Table 1 below) because of outswing doors and windows that pull tight under negative pressure, but in some cases temporary seals on intentional openings can be blown off during testing, causing abnormally high results.
The depressurization rale during the core-back operation was changed by the core-back rate, and it was increased as the core-back rate was increased.
Skin fatigue sets in when the passenger cabin goes through thousands of pressurization and depressurization cycles that stem from the takeoffs and landings.
Variable pressure set points, hold time and depressurization rates are programmed into PLC controls.
According to the ministry's latest findings, Skymark's pilots were not following the set procedure under which one of the two co-pilots must put on an oxygen mask to prepare for any emergency depressurization when the other leaves the cockpit for lavatory or other reasons during a flight at 3,000 meters or more in altitude.
Instead of just bubbling ozone through polluted water, he uses repeated cycles of pressurization of ozone and dirty water so the ozone saturates the water, followed by depressurization so the ozone expands into numerous microbubbles in the polluted water, similar to the way a carbonated beverage foams and overflows if opened quickly.
Since there was no voice message from the flight deck crew announcing an emergency, only automatic signals indicating electrical faults and cabin depressurization, whatever disaster overtook the aircraft, happened with considerable speed.
Suction must be applied during depressurization if there is an air leak of 5 1/min or greater coming from the patient, otherwise suction is not essential.
Although the test lasted only a few hours, it revealed how quickly the sediments responded to depressurization, how fast the water and gas flowed into the well, and the strength and permeability of the sediments.
Snubbers serve to isolate gauges and other instrumentation for removal from a system without depressurization.
Anytime there's a depressurization there's a possibility.