ASME B16.51-2018 pdf – Copper and Copper Alloy Press-Connect Pressure Fittings.
Tolerance for an internal threaded end having an internal shoulder shall be from the gage reference point (notch) to one turn small. Tolerance for an internally threaded end without a shoulder and for an externally threaded end shall be from one turn small to one turn large.
10.3 DesIgn of Threaded Ends
The wrenching section of internally threaded ends shall be polygonal, and the wrenching section of externally threaded ends shall be furnished with either polygon or flats, at the manufacturer’s option.
The maximum allowable deviation in the angular alignment of any end from the specified axis position shall be deg (1 deg total). See Figure 11-1.
12.1 Preferred Gaging Method of Press-Joint Ends
The preferred method olgaging the diameter tolerances for external and internal ends shall be by the use of plain plug and ring gages designed to hold the product within the limits established In Table 9.1-1. Gage tolerances shall be Class ZM, as defined in ANSI H4.4M.
12.2 OptionaL Gaging Method of Press-Connect Pressure Fittings
For gaging the diameter tolerance ol external and internal ends, the use of direct-reading instruments instead of ring and plug gages as specified in para. 12.1 shall be permitted. When gaging the diameters of external and internal ends using direct-reading instruments, refer to para. 9.2.
12.3 Standard Gaging Method of Threaded Ends
The standard method of gaging the externally and internally threaded ends shall be in accordance with the requirements of ASME H1.20.1.
NOTE: In gaging pipe threads, it is acceptable and common pracbce to rap or tap the part to ensure proper seating of the gage However, It is first necessary to clean both the gage and the product threads to ensure that they are tree of chips, burrs, abrasives, or other foreign materials.
The manufacturer of press.connection fittings shall provide instructions for the installation of the fittings. The instructions shall provide a minimum of
(a) end preparation of the tube
(b) assembly of copper tube to the fitting
14.4 Static Torque Test
14.4.1 Test Assembly. Prepare samples with a copper press-connect coupling joining two equal lengths of hard- drawn copper tube. One end of the test assembly shall be fixed and the other end fabricated to accommodate a moment arm, as shown In Figure Each test assembly with a press-connect fitting shall have a mrnlmum torque applied as specified In Table 144.l.1.
After applying the torque, release the force and subpect the sample to a water pressure test of 2 760 kPa ± SO kPa (400 psi ± 7 psi) gage pressure for a period of 48 h at a temperature of 20°C ± 5°C (68°F ± 9°F).
14.4.2 Acceptance Criteria. The press-connect fitting shall withstand the minimum torque listed In Table 14.4.1• 1. During the test, there shall be no visible leakage of the joint.
14.5 Bending Test
14.5.1 Test AssembLy. A test assembly shall have two
1 020 mm (40 in,) lengths of hard-drawn copper tube joined with a coupling with an Internal stop. The sample shall be centered between supports spaced 1 829 mm (6.0 it) apart as shown in Figure A concentrated load shall be applied to the center of the span at the center of the coupling. The concentrated load shall be in accordance with Table 14.5.1-1. A hydrostatic internal pressure of 4 140 kPa ± 50 kPa (600 psi ±7 psi) shall be applied and maintained fora period oil hat a temperature of 20°C ± 5°C (68°F ± 9°F).
14.5.2 Acceptance Criteria. During the test, there shall be no visible leakage of the jolni
14.6 Vacuum Test
14.6.1 Test Assembly. A test assembly shall have a press-connect fitting.
The sample shall be sublected to a vacuum of—83 kPa ±2 kPa (-24.5 in. Hg ± 0.5 in. Hg) at a temperature of 20°C ± 5°C (68°F ± 9°F). Once the vacuum Is established, the sample shall be isolated. The vacuum shall be maintained for a period of 1 h.
14.6.2 Acceptance Criteria. The maximum change in vacuum shall not exceed 3.4 kPa (1.0 in. Hg) within the 1-h test period.
14.7 CycLic Pressure Test
14.7.1 Test Assembly. Thc test assembly shall have a minimum of one press-connect fitting. The sample shall be installed In a system filled with water at a temperature of 20°C ± 5°C (68°F ± 9°F) pressurized to 100 kPa ± 10 kPa (14.7 psi ± 1.5 psi). The specimen shall be subjected to a hydraulic shock of 2 760 kPa ± 200 kPa (400 psi ± 29 psi) for 10000 cycles at a sinusoidal pressure with a frequency of 0.5 Hz.