N.Y. Comp. Codes R. & Regs. tit. 12, § 14-9.43
(b) Each boiler, superheater and waterwall to which an ASME Code symbol is to be applied shall be fabricated by a manufacturer who is in possession of the appropriate ASME Code Symbol Stamp, and a valid Certificate of Authorization. Six ASME Code Symbol Stamps are defined as follows:
S — power boiler symbol stamp
M — miniature boiler symbol stamp
E — electric boiler symbol stamp
A — boiler assembly symbol stamp
PP — pressure piping symbol stamp
V —safety valve symbol stamp
Any manufacturer or assembler holding an official “S”, “M”, “E”, “A”, “PP”, or “V” stamp of the American Society of Mechanical Engineers and the Certificate of Authorization shall have, and demonstrate, a quality control system to establish that all Code requirements including material, design, fabrication, examination (by the manufacturer), and inspection for boilers and boiler parts (by the authorized inspector) will be met.
(d) Each boiler shall be stamped with the appropriate American Society of Mechanical Engineers symbol and stamped in accordance with the National Board of Boiler and Pressure Vessel Inspectors requirements. In addition to the symbol, the following items shall also be stamped with letters and figures at least 5/16 inch high (5/32 inch on miniature boilers if necessary), arranged as shown below:
Items on Boilers
(6) Rated steaming capacity (required only for waste heat boilers not equipped for, direct firing)
Items on Waterwalls and Superheaters
(5) Design temperature (required only for separately fired superheaters)