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SM Fitting Copper


SM Fitting

Fittings manufactured to the Standard shall have an ambient bursting strength of at least four times the 100° F rated internal working pressure.

Fittings Rating ( rated internal working pressures for annealed temper ASTM B 88 type L copper
water tube are calculated as follows :
P = (2*S*t)/(D-0.8*t)


P = rated working pressure at
temperature (psi)

S = allowable stress at temperature
(psi) from ASME B31.1 or ASME

t = minimum wall thickness (in) from
annealed temper ASTM B 88 for
D = maximum outside diameter (in)
from annealed temper ASTM B 88

S values are found in ASME B 31