ASME B16.3:2011 pdf free download

ASME B16.3:2011 pdf free download.Malleable lron Threaded Fittings Classes 150 and 300.
(b) Cenfer-Io-End. Permitted tolerances on the center-to-end dimensions of the fittings are shown in Tables 2 and 1-2. Tolerances for end-to-end dimensions and lengths of couplings and reducers shall be twice those given. The largest opening in a reducing fitting governs the tolerances to be applied to all openings. These tolerances do not apply to return bends and caps.
8 ThREADING
8.1 Types of Threads
All litlings shall be threaded according to ANSI/ASME 81,20.1, and shall have taper threads, except wrought couplings (Tables S and I-B) and wrought caps (Tables 9 and 1-9) in NI’S ‘4. ‘4, and ‘4. which may have straight threads.
8.2 Tolerances
Variations in taper threading shall be limited to one turn large or one turn small from the gaging face on ring and gaging notch on plug when using working gages. The variations in straight threading shall Lw limited to one and one-hall turns large or small from the gaging notch on plug when using a taper pipe thread working gage. The reference point for gaging internal fittings threads depends upon the chamfer diameter. When the internal chamfer diameter exceeds the major diameter of the internal thread, the reference point is the last thread scratch on the chamfer cone. When the internal chamfer diameter does not exceed the major diameter of the internal thread, the reference point is the end of the fitting (see Fig. 2).
8.3 CountersInk or Chamfer
For 11w purpose of easier entrance in making a joint and for protection of the thread, all internal threads shall be countersunk a distance of not less than one-half the pitch of the thread at an angle of approximately 45 deg with the axis of the thread; all external threads shall be chamfered at an angle of 30 deg to 45 deg with the axis. Countersinking and chamfering shall be concentric with the threads.
8.4 Thread Length
The length of threads specified in all tables shall be measured to include the countersink or chamfer.
8.5 Alignment
The maximum allowable variation in the alignment of threads of all openings of threaded fittings shall be 5.0 mm/m (0.0 in./ft) 0.5% slopel.