ASME B16.3-2006 pdf download.Malleable lron Threaded Fittings. Use of a pressure rating at a material temperature other than that of the contained fluid is the responsibility of the user and subject to the requirements of any applicable code. (d) Class 300 street elbows are not recommended for pressures above 600 psi. 3 SIZE 3.1 Nominal Pipe Size As applied in...