The Steamboating Forum

I've searched and searched and without spending $18,000 for the ASME code book I'd like to find a diagram of the various ASME Code stamps and there meanings. Any one here have such a thing?

ASME Code Stamps, some definitions relevant to Steamboating:
S = Steam Power Boiler, over 15 PSIG MAWP.
M = Miniature Power Boiler, 100 PSIG MAWP, 20 square feet max, must fit in a 5 cubic feet box, plus many other requirements.
A = Field Boiler Assembly.
V = Power Boiler Safety Valves
R = Boiler repair
H = Heating Boilers, under 15 PSIG MAWP.
U = Unfired Pressure Vessels
T = Transport Tanks
N = Nuclear Components, very few if any steamboats, except submarines.

That is exactly what I needed! Thank you, Thank you, Thank you!