ASME B16.51-2013 pdf download

ASME B16.51-2013 pdf download.Copper and Copper Alloy Press-Connect Pressure Fittings.
9 DESIGN
9.1 General
As a minimum, the fitting shall be designed to withstand the tests specified in section 14 without leakage. The press-connect ends shall be assembled in accordance with the fitting manufacturer’s installation instructions. The dimensions and tolerances of the press-connect ends shall be as shown in Table I (Table I-I).
9.2 Out-of-Roundness of Fitting End (P or FTG)
Maximum out-of-roundness of the press-connect fitting ends, dimensions A and F, shall not exceed 1% of the maximum corresponding diameters shown in Table 1 (Table 1-1). The average of the maximum and minimum diameters shall be within the dimensions shown in Table 1 (Table I-i).
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 0 in Table I (Table 1-1). The out-of-roundness condition of the cross-sectional area shall not exceed lO% of the minimum diameter shown in Table I (Table I-i).
For reducer or adapter fittings, the smallest end diameter shall apply, provided that this diameter does not restrict the other outlets.
9.4 WaIl Thickness
The minimum wall thickness taken at any location of the fitting shall not be less than shown in Table I (Table I-I).
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 he 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 chamfering shall be concentric with the threads. The length of
14.8.2 Acceptance Criteria. During the test, there shall be no visible leakage of the joint.
14.9 Thermocycling Test
14.9.1 Test Assembly. A test assembly shall be constructed using Type L copper tube and press-connect fittings in accordance with Fig. 8. The specimen shall be installed in a test assembly that permits the flow of oxygenated water at a pressure of 1 000 kPa ± 50 kPa (145 psi ± 7 psi). Flow water at a temperature of 20°C ± 5°C (68°F ± 9°F) through the specimen for a period of 15 mm for nominal size 2 and smaller, and 30 mm for nominal size 21/2 and larger. Change the flow to hot water at a temperature of 93°C ± 5°C (200°F ± 9°F) for a period of 15 mm for nominal size 2 and smaller, and 30 mm for nominal size 21/2 and larger. Continue this cycling for 5 000 cycles for nominal size 2 and smaller, and 2 500 cycles for nominal size 2’/2 and larger. The water temperature in the piping shall reach the change in temperature within a period of 2 mm.
14.9.2 Acceptance Criteria
(a) During the test, there shall be no visible leakage of the joint.
(b) The elastomeric material shall conform to para. 6.3(d).
14.10 Dynamic Torque Test
14.10.1 Test Assembly. Prepare two samples with a copper press-connect coupling joining two lengths of copper tube. Install one test assembly in a dynamic torque test assembly that twists the tube, at the non- fixed end, with respect to the coupling, ±5 deg ± 0.5 deg, as shown in Fig. 9. At a temperature of 20°C ± 5°C (68°F ± 9°F), cycle the specimen 10 000 times (a cycle is twisting one direction, reversing and twisting in the other direction). Repeat the test with the second sample at a temperature of 93°C ± 2°C (200°F ± 5°F). After completing the twisting cycles, the samples shall be hydrostatically tested to a pressure of 2 760 kPa ±50 kPa (400 psi ± 7 psi) for a period of I h at a temperature of
20°C ± 5°C (68°F ± 9°F).
14.10.2 Acceptance Criteria. During the test, there shall be no visible leakage of the joint.