ASME B16.51-2011 pdf – Copper and Copper Alloy Press-Connect Pressure Fittings.
10.3 Design of Threaded Ends
The wrenching section of internally threaded ends shall he polygonal. and the wrenching section of ester- natty threaded ends shall be furnished with either polygon or flats, at the manuIactursrr’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 Fig. 3.
12.1 Preferred Gaging Method of Press-Joint Ends
The preferred method of gaging 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 estat,lished in Table I (Table I-I). Gage tolerances shall be Class ZM, as defined in ASME 134AM.
12.2 OptIonal Gaging Method of Press-Connect Pressure Fittings
For gaging the diameter tolerance of external and internal ends, the use of direct reading instruments instead of ring and plug gages as specified in para. 121 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 ANSI/ASME Bl.20.I.
NOTE: In gaging pipe threads, it is acceptable and common praclice to rap or tap the part to ensure proper seating of the gage. l-knsever, It Is first necessary to clean both the gage and the product threads to ensure that they are free of chips, burrs. abisves. re other foreign matrflah
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
(ii) assembly of copper tube to the fitting
(c) requirements for the tool used to form the press- connect joint
(d) pressing procedure
Installation insti-uctions shall include details to enable assemblers to install fittings with performance consistent with that demonstrated by the design qtialification testing described in section 14.
The pressure-temperature ratings are mly applicable to fittings that are installed in accordance with the manufacturer’s instructions.
14.1 General
Press-connection fitting shall be qualified with the performance tests defined herein. The fittings shall be tested with both ASThI Type K and Type M hard drawn tube, so two sets of tests are required. except for the therinocycle test described in para. 14.9.
Manufacturers shall retain test reports demonstrating compliance with this Standard. For any design change, the performance tests shall be repeated.
Press-connection of the test assemblies shall be done according to the fitting manufacturer’s installation instructions. Each test shall be performed on a new test assembly.
14.2 HydrostatIc Pressure Test at 20UC (68°F)
14.2.1 Test Assembly. The test assembly shall con- tarn a press-connection fitting located between two seeLions of copper tube as shown in Fig. 4. The sample shall not be restrained in the test assembly. The sample shall be filled with water to a pressure of 4 140 kPa ± 50 kPa (600 psi a 7 psi) at a temperature of 20°C ± 5°C (6WF ± 9°F) for a period of 4K h.
14.2.2 Acceptance Criteria. During the first hour. the maximum slippage of eah joint shall be as specified in Table 2 (Table 1-2). Once the I-h slippage is recorded. the maximum additional slippage after the first hour shall not exceed the distance specified in Table 2 (Table 1-2). During the test, there shall be no visible leakage of the joint
14.3 Unrestrained Hydrostatic Pressure lest At 93°C (200°F)
14.3.1 Test Assembly. The test assembly shall contain a press-connect fitting located between two sections of copper Lube as shown in Fig. 4. The sample shall not be restrained in the test assemt4 The sample shall be filled with water to a pressure of 414 kpa ± 50 kPa (600 psi ± 7 psi) and held at a temperature of 93°C ± 2°C (200°F ± 5°F) for a period of 48 h.
14.3.2 Acceptance Criteria. The acceptance criteria shall be as defined in para. 14.2.2.