If the survey is enabled in the survey settings, then a technician or the ServiceDesk Plus administrator can manually send a survey to the requesters once the survey is closed.
To send the survey:
Log in to ServiceDesk Plus On-Demand application using your user name and password or that of the ServiceDesk Plus On-Demand administrator.
Click the Requests tab.
In the Request list view, select the filter Completed Requests or My Completed Requests.
Click the request Title for which you wish to send the survey.
Click Send Survey for this Request link available under the Actions block. A success message that the survey has been sent for the request is displayed and the survey will be sent to the requester who created the request as a mail with a URL which opens the survey.