Throttling release

There is considerable potential, therefore, for mineral scale, such as barium sulfate (see the next section), to form during these procedures. The scale may be deposited in the formation, the wellbore, or in production tubing. Scale that forms in the formation near wells, known as formation damage, can dramatically lower permeability and throttle production. When it forms in the wellbore and production tubing, mineral scale is costly to remove and may lead to safety problems if it blocks release valves. 

Source models for throttling releases require detailed information on the physical structure of the leak they are not considered here. Free expansion release source models require only the diameter of the leak. 

A compressed gas tank, when filled, may contain up to 2500 lb/in.2 of pressure. These tremendous pressures cannot be throttled by the main tank valve to pressures that are usable in the laboratory. All the main tank valve can do is release or prevent the release of gas, not control the pressure with which a gas is released. A regulator is required to reduce the gas pressure in a controlled, stable, consistent, and reliable manner. 

Controlling reflux drum temperature by throttling cooling water to condenser caused boiling of cooling water when control valve cloeed. This resulted in atmospheric product release. 

Since high power is applied to the turbo-expander s arbor, it is used to drive generators, pumps, and compressors. Therein lies the basic advantage of turboexpanders as compared to throttles, where the energy released at pressure drop is just wasted. 

In flash distillation, a liquid mixture at its boiling temperature (under pressure) is released into a vapor-liquid separator or a rectification column. No heat is added or removed (isenthalpic throttling, see Fig. 2-13). 

Shut ofiF the chain saw or release the throttle prior to retreating. 

Pressing the throttle, or control lever, downwards releases the control valve. This allows compressed air to enter the drill. The air passes through the valve and down a chamber called a return chamber to the underside of the piston. The pressure forces the piston to rise up the cylinder. As the piston rises, it covers the exhaust, preventing the air from escaping. At the same time, the rising piston starts to compress the air trapped above it. 

When the treatment cycle is completed, the effluent is allowed to cool naturally to below 100°C. At this point, the drain is opened and ballast pressure (0.3 bar g) is used to discharge the effluent via a throttling valve. This allows the rate of discharge to be set to suit the ability of the site drains to cool the outflowing effluent to near-ambient temperature within a short distance of the release point. 

The extent to which fission products are released from the fuel rods to the coolant inside the channel is dependent on the increase in the temperature of the fuel. During leak testing, the flow of coolant through the assembly is throttled by blocking its upper end. The decay heat produces a rise in the temperature of the fuel and thus... 

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