N.Y.C. Admin. Code § 28-303.2.1: § 28-303.2.1 Internal inspection required.

All high-pressure boilers shall have an annual internal inspection performed in accordance with section 204 of New York State Labor Law and the rules of the department. Where construction of a low-pressure boiler allows, an internal inspection shall be performed on a periodic schedule in accordance with section 204 of the New York State Labor Law and the rules of the department.