In addition to department boiler inspectors, the Commissioner of Administrative Services shall, upon the application of any company authorized to insure against loss from explosion of boilers in this state, issue to any boiler inspectors of said company commissions as special inspectors, provided each such inspector before receiving his commission shall pass satisfactorily the examination provided for in § 29-235. The Commissioner of Administrative Services may recognize in lieu of such examination a certificate of competency as an inspector of boilers for a state that has a standard of examination substantially equal to that of the state of Connecticut, or a commission as an inspector of boilers from the National Board of Boiler and Pressure Vessel Inspectors. Such special inspectors shall receive no salary from, nor shall any of their expenses be paid by, the state, and the continuance of a special inspector’s commission shall be conditioned upon his continuing in the employ of such a boiler inspection and insurance company, and upon his maintenance of the standards imposed by this chapter. Each such company shall promptly notify the commissioner of any special inspector’s termination of employment. Such special inspectors shall inspect all boilers insured by their respective companies, and the owners or users of such insured boilers shall be exempt from the payment of inspection fees, as provided for in this chapter. Each company employing such special inspectors shall, within fifteen days following each internal inspection made by such inspectors, file a report of such inspection with the Department of Administrative Services upon appropriate forms as promulgated by the Commissioner of Administrative Services, who may use the standards of the American Society of Mechanical Engineers.