I'm assuming that a request is tied to a request template when it is used, cause I have some old request templates that I created that we don't use anymore and tried to delete them unsuccessfully. 

Is there any other way to delete the request templates?  I've got like 50 request templates and a good 10 aren't even valid. 

can someone shed some light on a way to delete them?

Forgot to include that I'm on 7.6.0 Build 7602