Malleable Iron Pipe Fittings Pressure Rating

Asme b 16 39 malleable iron threaded pipe unions threads.

Malleable iron pipe fittings pressure rating.

Again it s a little more complicated you have to look at the fluid and the temperature because the pressure is related to temperature. The pressure rating roughly of a 150 pound malleable iron fitting is 150 psi 300 pound malleable iron fitting has a pressure rating of 300 psi. Malleable iron threaded fittings pressure temperature ratings class 150 class 300 nps normal pipe size 1 4 1 11 4 2 2 1 2 3 temp c temp f bar psi bar psi bar psi bar psi. Pressure ratings pressure ratings of pipes and tubes and their fittings carbon steel stainless steel plastic copper and more.

Pressure temperature ratings. A class 150 rating means these fittings have been tested and approved for a maximum pressure of 300 psi at 150 f. The ratings given are uprated from those in the 1968 edition both for malleable cast iron and bronze fittings. Cast iron there are four basic types of cast iron white iron gray.

Asme b16 3 2006 is the standard used to test malleable iron threaded fittings to make sure they meet the proper pressure and temperature ratings. Ansi asme b1 20 1 pipe threads. 150 black galvanized malleable iron pipe fittings meets or exceeds all applicable astm and ansi standards stocked from 1 8 through 6 diameters 100 pressure tested before leaving the factory. Class 150 malleable iron threaded fittings have no pressure class markings.

As the temperature goes up the pressure goes down. Some malleable fittings such as floor flange lateral street tee and bullhead tees are not commonly available in forged iron. Threading identification marking class 300 malleable iron threaded fittings are marked with the numerals 300 the letters mi and the size. Asme ansi b16 standards for pipes and fittings the asme b16 standards covers pipes and fittings in cast iron cast bronze wrought copper and steel.

Malleable iron fittings are lighter fittings in 150 and 300 pressure class. Bsi pipe tube and fittings standards and specifications british. Please note that although products are designed using the asme b16 3 standard which have a pressure rating of 300 psi fm approval is only for up to 175 psi and there are no temperature range requirements specified by the fm1920 standard. Pressure ratings pressure ratings of pipes and tubes and their fittings carbon steel stainless steel plastic copper and more.

Bs 143 1256 1986 states that fittings are for general purposes for the transmission of fluids within the pressure and temperature ranges specified.