Check how to apply for obtaining Approval for Boiler/Economiser Repairer. Designated Officer for delivery of Service is Inspecting officer of concern Regional Office. Maximum number of days to get service Delivered is 23 days wide Government Notification no. MISC2017/C.R.66/Lab-9 Date . 20.06.2017 . Procedure involved for the service nbsp;is Scrutiny of documents, Verification of competency of firm by site visit and issue of approval / renewal letter