ASME B16.14 pdf download Ferrous Pipe Plugs, Bushings, and Locknuts With Pipe Threads
3 PRESSURE–TEMPERATURE RATINGS
(a) Pressure–temperature ratings for plugs and bush- ings shall be in accordance with ASME B16.4 if made of cast iron, or ASME B16.3 if made of malleable iron, ductile iron, or steel. Use of cored plugs or hexagon head bushings should be limited to Class 125 cast iron and Class 150 malleable iron threaded fittings. Solid plugs and face bushings are recommended for use with Class 250 cast iron fittings and Class 300 malleable iron fittings.
(b) Locknuts are not pressure–temperature rated.
4 NOMINAL PIPE SIZE As applied in this Standard, the use of the phrase “nominal pipe size” or the designation NPS followed by a dimensionless number is for identifying the end connection of fittings. The number is not necessarily the same as the fitting inside diameter.
5 MARKING Each fitting shall be marked for identification with the manufacturer’s name or trademark, except where a marking is impractical.
(a) These fittings are furnished in gray iron, malleable iron, ductile iron, or steel as indicated in the individual tables.
(b) The chemical and mechanical properties of cast material shall equal or exceed those properties listed in ASTM A 126, as applicable. Steel castings, forgings, or machined bar properties shall correspond to the comparable ASTM casting material specifications. The fittings manufacturer shall be prepared to certify conformance based on test data.
7 DIMENSIONS AND TOLERANCES (a) Dimensions in metric units are given in Tables 1 through 5 for various types of fittings. Corresponding U.S. Customary values are given in Tables I-1 through I-5 in Mandatory Appendix I.
(b) At no point in the component wall shall the metal thickness be less than 90% of the values listed in the tables.
8.1 Thread Form
Threads shall be in accordance with ANSI/ASME B1.20.1. All internal taper pipe threads shall be countersunk a distance not less than one-half the pitch of the thread at an angle of approximately 45 deg with the axis of the thread. External taper pipe threads shall be chamfered at an angle between 30 deg and 45 deg with the axis. Countersinking and chamfering shall be concentric with the threads.
(a) The length of threads specified in the tables shall include the countersink or chamfer.
(b) The maximum allowable variation in the align- ment of threads of all openings shall be 5.0 mm/m (0.06 in./ft).
8.2 Plugs Plugs shall be threaded with ANSI/ASME B1.20.1 taper pipe threads. The variation in threading shall be limited to one turn large or one turn small from the gaging notch on the plug or the gaging face of the ring when using working gages.
8.3 Bushings Bushings shall be threaded with American National Standard taper pipe threads. Gaging of all threads shall comply with ANSI/ASME B1.20.1, except those sizes of outside hexagon bushings where the external thread lengths are shorter than those required by ANSI/ASME B1.20.1. These bushings should be threaded so thatwhen making up the joint, the shoulder of the head will not interfere. To ensure this, the threads, when made to the minimum length, shall be gaged as listed below with a tolerance of one turn large or one turn small.
(a) An outside head bushing is one having any part of the polygon protruding beyond the outside diameter of the large end of the external thread.
(b) An inside head bushing is one having all parts of the polygon head contained within the root diameter of the large end of the external thread.
(c) A face bushing is one having two lugs on the face of the large end of the external thread by which a bar can be used for makeup with internal pipe threads. Lugs are optional on face bushings in small pipe sizes when made of bar stock.