I dont have the pipesys extension - but is would be possible with the "noral" HYSYS pipesegment.
But its more difficult that with most other hysys components since the pipesegment is not "wrapped" in VB. This means that you have to use backdoor variables and monikers - but you can find examples and guidiance to this at the supportweb from aspentech.
Best regards
Morten