N.Y. Comp. Codes R. & Regs. tit. 12, § 14-3.20 – Rerating of a boiler.

(1) Revised calculations verifying the suitability of the vessel for the new service conditions shall be requested from the original manufacturer and shall be made available to its authorized inspection agency and the jurisdiction. Where these calculations cannot be obtained from this source, they may be prepared by a registered professional engineer and forwarded for review by the authorized inspection agency and the jurisdiction.
(2) All reratings shall be established in accordance with the requirements of the ASME Code to which the boiler was built, or by computation using the appropriate formulas in the ASME Code, if all essential details are known definitely to comply with said Code.
(3) Current inspection records shall verify that the boiler is satisfactory for the proposed service conditions.
(4) The boiler rerating shall be acceptable to the authorized inspector employed by the authorized inspection agency responsible for the inservice inspections of the object.
(5) The boiler shall be pressure tested, as required, for the new service conditions.
(b) Report requirements.
After complying with the requirements of paragraphs (a)(1) through (5) of this section, a Report of Alteration (Figure 14-3 c) shall be prepared and completed in accordance with section 14-3.3(c)(1) through (3) and distributed as indicated in subdivision (c) of this section.
(c) Distribution of report of alteration including rerating.
Legible copies of the complete Report of Alteration, together with attachments, shall be distributed by the organization responsible for the alteration, to the authorized inspection agency responsible for the inservice inspection of the boiler, the owner or user, the department and to the National Board, if the object is so registered.
(d) Stamping or nameplate attachment and authorization of same shall be in accordance with section 14-3.3(b)(1) of this Subpart.

(a) General requirements.

Rerating of a boiler by increasing the maximum allowable working pressure (MAWP) or temperature or decreasing the minimum temperature such that additional mechanical tests are required, shall be considered an alteration and may be done only after the requirements of paragraphs (1) through (5) of this subdivision have been met.