A general method has been developed to designate the location of tapped holes and/or bosses in pipe fittings. These designated locations can also be helpful in specifying the location of bases on certain unobvious conditions eg. Reducing 90 degree bends. Refer to table 4.2 below.
The illustrations show two views of the same fitting and represent fittings with symmetrical shapes, with the exception of the side outlet elbow and the side outlet tee. When a cast iron flanged fitting is wanted with a tapped connection, give the size of the tapping required, and designate its location by means of a letter selected from the correct view of the fitting in question.
