53 Pa. Stat. § 25312
All persons desiring authority to perform the duties of an engineer shall apply to the boiler inspector of such cities, who shall examine the applicant as to his knowledge of steam machinery and his experience in operating the same, also the proofs he produces in support of his claim, and if, upon full consideration, the inspector is satisfied that the applicant's character, habits of life, knowledge and experience in the duties of an engineer, are all such as to authorize the belief that he is a suitable and safe person to be entrusted with the powers and duties of such a station, he shall grant him a license, upon the payment of three (3) dollars, authorizing him to be employed in such duties for the term of one year, and such license shall be annually renewed, without examination, upon the payment of one (1) dollar, provided it is presented for renewal within ten days after its expiration.
53 P.S. § 25312