Paliwal's unbeaten 178-ball 147, which was studded with 19 fours and three sixes, was cornerstone of Services innings after a top-order collapse.
Lower down the order, Devender Lochab also added 31 runs to help Services be in a reasonably good position.
For Tripura, Rana Dutta grabbed four wickets for 53 runs in his 20 overs.
Brief Scores:
Services: 282/5 in 76 overs (Rajat Paliwal 147 batting, Rana Dutta 4/53).