bids are invited for in31 bay of bengal-northern portion-krishnapatnam to bassein river , in224 manappad to setukkarai , in262 kanyakumari to pamban , in263 kanyakumari to colombo , in264 southern coast of sri lanka , in 302 sagar island to damra port , in 303 dhamra port to paradip port , in 304 approaches to chandrabhaga , in 305 approaches to gopalpur , in 315 palk strait , in 316 palk bay eastern portion , in 317 palk bay western portion , in 358 approaches to palk bay , in 2037 valinokkam, vappalodai anchorage , in 2075 tuticorin harbour and appr to tuticorin , in3005 machilipatnam anchorage , in 3016 approaches to mandapam , in 3501 kankesanturai harbour total quantity : 18