Page 492 - Boiler_Operators_Handbook,_Second_Edition

Appendices 477

Appendix T

Code Symbol Stamps

Your boiler or boilers will have one or more of the these ASME Code Symbol stamps applied to the construction.

The letter within the symbol identifies the product and S- Steam boiler, to manufacture power boilers,
quality of construction. These stamps can only be ap- high temperature hot water and organic fluid
plied by manufacturers authorized by ASME to use their heating boilers.
respective stamp. Under no circumstances should you U - Unfired pressure vessel, to manufacture pres-
remove, alter, or obliterate the symbol stamp and the sure vessels.
lettering next to it (which is also required by the Code). UM - Miniature unfired pressure vessel, to manufac-
The definition of the stamps and the general scope of the ture small pressure vessels
authorization, including those you will find on pressure UV - Safety valves, manufacture of safety valves for
vessels (not shown above) are as follows: unfired pressure vessels
V - Safety valves, manufacture of safety valves for
A - Assembly, to assemble boilers. high pressure boilers
E - Electric boiler, to manufacture electric boilers.
H - Heating boiler, to manufacture heating boilers. Note that the manufacturer’s certificate will also define
M - Miniature boiler, to manufacture miniature the locations where the manufacturing can be done,
boilers. either in the shop named on the Certificate of Authori-
PP - Power piping, to manufacture boiler external zation, or (also) in the field.
piping.