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AWS D1.1 2008 Structural Welding Code (21st Edition) by American Welding Society (AWS)

By American Welding Society (AWS)

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Additional resources for AWS D1.1 2008 Structural Welding Code (21st Edition)

Sample text

Gas turbines, for example, are greatly affected by the external temperature. They work by burning natural gas or a fuel oil with a fixed volumetric rate of compressed air, so a turbine’s power output is directly proportional to the mass rate of the compressed air that enters the system. When the weather gets hotter, the mass rate of the compressed air decreases because warmer air has a lower density, so the turbine’s power output decreases. The effect is marked when the surrounding air temperature is above 30 ◦ C.

Some protection is built in. For example, the west coast is subject to salt pollution from high winds. Protection takes the form of a spray that is released when the salt burden gets too big. Electricity is bought and sold in the UK through a system known as the British Electricity Trading and Transmission Arrangements (BETTA). As National Grid explains, the arrangements are based on bilateral trading among generators, suppliers, traders and customers, in any paired combination, across a series of markets operating on a rolling half-hourly basis, which means that it is managed in half-hourly time slots.

The biggest TV pickup ever recorded was on 4 July 1990 following a semifinal World Cup football game between England and Germany. The game went to penalties, and, within minutes of their finishing, demand rose by 2 800 MW. The high-voltage grid that National Grid manages reaches very few of the country’s individual users. But that does not mean National Grid can leave questions of load to the DNOs. Changes in consumption require the grid to bring extra power onto the system and it can be very sensitive.

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