SJVN said that the deadline for M&E bids had been put back to 15 June. The project calls for six No 68.7MW vertical axis Francis turbines [214.3rpm] and also three No 5.4m diameter butterfly valves.
Rampur is being built downstream of the Naptha Khakri power plant and therefore benefits from the cascade arrangement by not requiring a dam or desilting chambers. Water will be fed to a surface power house through a 15km long, 10.5m diameter headrace and through three 5.4m diameter penstocks, bifurcating to 3.8m wide tubes leading to the turbines.
Gross head for the project is 139.7m and net head is 119.1m. The design discharge is 384m3/sec. Rampur is expected to generate almost 1970GWh in a 90% dependable year with 95% machine availability.
The project was approved in 2005 and has a construction schedule of 60 months. At present, access roads are being built and excavation of adit for tunnelling works are underway.
On the Devasari project, consultant Colenco Power Engineering has begun studies for the project in Uttrakhand state, and which is now to be a three stage development. The first stage is to be 300MW, which was the initial total capacity of the scheme to be commissioned by 2012; the second and third stages are to have capacities of 245MW and 45MW, respectively.
The initial design for the 300MW scheme called for a 90m high concrete gravity dam across the river Pindar, a 7.4km long headrace with a design discharge of almost 150m3/sec, an underground power house, three vertical axis 100MW Francis turbines, and a 1080m tailrace tunnel.
Colenco was appointed in February this year and has undertaken first site visits to study the options for the enlarged scheme.
SJVN, which is a JV of the national government and the state of Himachal Pradesh, was previously known as Naptha Jhakri Power Corp.
