First of all thanks for your response.
Formerly, I have also of the same idea, but the service "supply of tangible goods for use" defines in Notification No. 24/2008-Service Tax as follows:
"Services of supply of tangible goods for use, without transferring right of possession and effective control of tangible goods, provided to an exporter in relation to goods exported by the exporter"
Now, what if,
1. such services provided to other than exporter ie. Stevedores like us
2. such services provided for activities other than exporter ie. Shifting from anchorage to jetty or transferring from port to port.
hope your valued ideas reveals some more clarification on the points.