ASME B16.15-2006 pdf download

ASME B16.15-2006 pdf download.Cast Copper Alloy Threaded Fittings.
The temperature shown for the corresponding pres- sure rating shall be the material temperature of the pressure-retaining structure. It may be assumed that the material temperature is the same as the fluid tempera- ture. Use of a pressure rating at a material temperature other than thatofthe contained fluid is the responsibility of the user and subject to the requirements of any appli- cable codes and regulations. 2.3 Limitations Useofcoredplugs and hexagonoroctagonhead bush- ings should be limited to Class 125 pipe fittings. Solid plugs and face bushings are recommended for use with Class 250 pipe fittings. 3 SIZE 3.1 Nominal Pipe Size The size of the pipe fittings scheduled in the following tables is identified by the corresponding nominal pipe size (NPS). 1 3.2 Reducing Sizes In the case of reducing tees, crosses, and Y branches (laterals), the NPS of the largest run opening shall be given first, followed by the NPS of the opening at the opposite end of the run. Where the pipe fitting is a tee or Y branch (lateral), the NPS of the outlet is given last. Where the pipe fitting is a cross, the largest side-outlet opening is the third dimension given, followed by the opening opposite. The straight line sketches of Fig. 1 illustrate how the reducing pipe fittings are read. 4 MARKING 4.1 Class 125 Fitting EachClass125 pipe fittingshallbe marked foridentifi- cation with the manufacturer’s name or trademark.
4.2 Class 250 Fitting EachClass250 pipe fittingshallbe marked foridentifi- cation with the manufacturer’s name or trademark, and the numerals “250.” 4.3 Exceptions Omission of markings is permissible when fittings are too small to provide sufficient marking area. 5 MATERIAL (a) Castings shall be produced to meet the require- ments of ASTM B 62, Alloy C83600 or the chemical and tensile requirements of ASTM B 584, Alloys C83800 or C84400; and in all other respects shall conform to the requirements of ASTM B 62 (b) Bar stock, when used for manufacturing smaller sizes of wrought plugs, bushings, caps, and couplings, shall be in accordance with the requirements of ASTM B 16, Alloy C36000 or ASTM B 140, Alloy C32000 or C31400.
6 THREADING 6.1 Types of Threads All pipe fittings shall be threaded with ANSI/ ASME B1.20.1 general purpose pipe threads and shall have taper threads, except wrought couplings (Tables 2 and I-2), wrought caps (Tables 3 and I-3), and wrought bushings (Tables 4 and I-4) in NPS l ⁄ 8 , NPS l ⁄ 4 , NPS 3 ⁄ 8 , and NPS l ⁄ 2 , which may have straight internal threads. 6.2 Tolerances The permissible tolerance 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 thread- ing shall be limited to one and one-half turns large or small from gaging notch on plug, when using 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. 6.3 Countersink or Chamfer All internal threads shall not be countersunk a dis- tance of less than one-half the pitch of the thread at an angle ofapproximately45 degwiththe axis ofthethread, and all external threads shall be chamfered at an angle of 30 deg to 45 deg with the axis, both for the purpose of easier entrance in making a joint, and for protection of the thread. Countersinking and chamfering shall be concentric with the threads. 6.4 Length of Thread The length of threads specified in all tables shall be measured to include the countersink or chamfer. 6.5 Alignment The maximum allowable variation in the alignment of threads of all openings of threaded pipe fittings shall be 1 mm/m (0.06 in./ft) or 0.5%.