Suppression of pressurizer surge line
's vibration detected in hot functional testing (HFT) is in progress and will be completed before fuel loading.
Under postulated accident conditions such as loss-of-coolant accidents (LOCAs) in pressurized water reactors (PWRs), steam and condensate water form countercurrent flows in a hot leg (consisting of a horizontal pipe, a 50-deg vertical elbow, and a short inclined pipe) and a pressurizer surge line
(consisting of a slightly inclined pipe with elbows, a vertical elbow, and a vertical pipe), and flooding may occur.
Due to the backflow of hot gas from the impeller operating close to the surge line
, the temperature increase at the inlet is also a commonly used surge indicator [6, 14].
The surge detection validation is carried out by the comparison of surge line
between CFD prediction and experimental results of the SRV2AB impeller with vaneless diffuser, which serves as the baseline for the subsequent optimization.
Anti-surge control is an important control for safety of the compressor and it can keep the compressor always running in the safe area right to the surge line
. In this paper, simulation results of the surge phenomenon occurring in a centrifugal compressor in various conditions such as high header pressure, low suction pressure, start-up and emergency shutdown of the unit are presented and their control strategies are discussed.
As a result, the traditionally static surge control line becomes a dynamic entity, allowing the compressor to be safely controlled closer to the true surge line
. This innovative control feature reduces waste by maximizing turn-down and minimizing bypass air, ensuring energy savings at off-peak operation.
Boeing plans to make room for the 777X assembly line in the factory by shutting down the 787 surge line
, Conner said.
Typically the first R-line is given a value of 1.0 that coincides with the surge line
. The remaining R-lines are roughly parallel to the surge line
with increasing R-line value corresponding to a higher surge margin.
* Compressor performance characteristics, including the OEM-supplied surge line
Boeing said it will build the first three 787-9s on its Temporary Surge Line
in Everett to allow for smoother integration of the 787-9 into the production system while continuing to ramp up production across the 787 program.