Singapore's Bukit Panjang Light Rail System BPLRT announced today that in addition to its existing 19 cars, it will also join two new cars and put them into service. This is the first time that the Bukit Panjang light rail system has added new cars to the existing cars. The light rail system was started in 1999. The newly added two cars can accommodate 105 passengers, similar to the trains of their existing trains. The two cars will be officially put into service at the end of next year. They will arrive in Singapore in June next year, and the Bukit Panjang depot will also conduct extensive reliability tests to ensure that these two cars can serve safely and effectively.
An impulse turbine is a type of Steam Turbine where the rotor derives its rotational force from the impact force, or the direct push of steam on the blades.
The impulse turbine consists of a rotor mounted on a shaft that is free to rotate. Attached to the rotor are a set of curved blades. Nozzles then direct the high pressure and high temperature steam towards the blades of the turbines. The blades catch the impact force of the rapidly moving steam and rotate from this force.
The steam at high pressure enters through a stationary nozzle of a steam turbine, as a result the pressure of the steam is decrease and an increase in steam velocity. As a result of increased steam velocity steam pass through the nozzle in the form of a high-speed jet. This high-velocity steam hit the properly shaped turbine blade, as a result, the steam flow direction is changed. The effect of this change in direction of the steam flow will produce an impulse force. This force cause the blade move, thereby the rotor will start to rotate.
The force applied to the blade is developed by causing the steam to change the direction of flow (Newton`s 2nd Law – change of momentum). The change of momentum produces the impulse force.
In the impulse turbine pressure drops and the velocity increases as the steam passes through the nozzles. When the steam passes through the moving blades the velocity drops but the pressure remains the same.
The fact that the pressure does not drop across the moving blades is the distinguishing feature of the impulse turbine. The pressure at the inlet of the moving blades is same as the pressure at the outlet of moving blades.
Impulse Steam Turbine Shandong Qingneng Power Co., Ltd. , http://www.qnpturbines.com
A total of 13 new train cars will be delivered and tested next year, and will be deployed and operational at the end of next year. It is estimated that this light rail system will increase passenger capacity by about 50% during peak hours. The Land Transport Authority stated that 13 extra cars will make the train more frequent, and the time gap between Choa Chu Kang Station and Bukit Panjang Light Rail Station will decrease from 2.5 minutes to 2.2 minutes. The Land Transport Authority stated that the other 4 trains had arrived in Singapore and were tested before being put into service. The remaining 7 trains will be gradually delivered in June next year and put into service at the end of the year. 
The Impulse Principle
Impulse Turbine Working:
