The Minimum Connection Time SQ->TG at PNH is 40 minutes - assuming this is all on a single ticket. There is no such thing as a ‘connection’ on separate tickets.
Results from ExpertFlyer.com
Minimum Connect Times:
Connecting at PNH
Incoming airline SQ
Outgoing airline TG
Flight type International to International
STANDARD.D/D...D/I...I/D...I/I.
ONLINE .40 .40 .40 .40
OFFLINE .40 .40 .40 .40