ASME B16.51 pdf download

ASME B16.51 pdf download Copper and Copper Alloy Press-Connect Pressure Fittings
9.2 Out-of-Roundness of Fitting End (P or FTG) Maximum out-of-roundness ofthe press-connectfitting ends, dimensions A and F, shall not exceed 1% of the maximum corresponding diameters shown in Table 9.1-1. The average of the maximum and minimum diameters shall be within the dimensions shown in Table 9.1-1.
9.3 Inside Diameter of Fitting The minimum cross-sectional area of the inside diameter through the fitting body shall not be less than the theoretical minimum area defined by diameter O in Table 9.1-1. The out-of-roundness condition of the cross-sectional area shall not exceed 10% of the minimum diameter shown in Table 9.1-1. For reducer or adapter fittings, the smallest end diameter shall apply, provided that this diameter does not restrict the other outlets.
9.4 Wall Thickness Theminimumwallthicknesstakenatanylocationofthe fitting shall not be less than shown in Table 9.1-1.
10 THREADED ENDS The threaded ends shall have right-hand nominal pipe taper (NPT) threads conforming to ASME B1.20.1.
10.1 Countersink or Chamfer All internal threads shall be countersunk a distance no 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 from the axis. Countersinking and cham- fering shall be concentric with the threads. The length of threads shall be measured to include the countersink or chamfer.
10.2 Threading Tolerances NPT threads shall be checked by use of a plug or ring gage in either standard or limit types. When gaging internal taper threads, the plug gage shall be screwed hand-tight into the fitting. The reference point for gaging internal product-threads depends on the chamfer diameter. When the internal chamfer diameter exceeds the major diameter of the internal thread, the reference point shall be the last thread scratch on the chamfer cone. Otherwise, when the internal chamfer diameter does not exceed the major diameter of the internal thread, the reference point shall be the end of the fitting. In gaging external taper threads, the ring gage shall be screwed hand-tight on the external thread. On the external thread, the ring gage shall be flush with the end of the thread.