ASME B16.50-2021 pdf download

ASME B16.50-2021 pdf download.Wrought Copper and Copper Alloy Braze-Joint Pressure Fittings.
This Standard establishes requirements for wrought copper and wrought copper alloy seamless pressure fittings designed for use by brazing with seamless copper tube conforming to ASTM B88 (for water and general plumbing systems), ASTM B280 (for air- conditioning and refrigeration service), and ASTM B819 (for medical gas systems).
Fittings made in accordance with this Standard are intended for assembly with brazing materials conforming to AWS A5.8M/A5.8.
This Standard is allied to ASME B 16.18 for cast copper alloy pressure fittings and ASME B16.22 for wrought fittings that can be used in soldering or brazing. This Standard provides requirements for fitting ends of suitable depth to only be joined by brazing. Fittings manufactured to this Standard are not suitable for joining by soldering. When soldering is the desired joining method, use fittings manufactured to ASME 1316.18 orASME B 16.22. This Standard covers
(a) pressure—temperature ratings
(b) abbreviations for end connections
(c) size and method of designating openings of fittings
(d) marking
(e) material
(f) dimensions and tolerances
(g) testing
2 GENERAL
2.1 ReLevant Units
This Standard states values in both SI (metric) and U.S. Customary units. These systems of units are to be regarded separately as standard. Within the text, the U.S. Customary units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, it is required that each system of units be used independently of the other. Combining values from the two systems constitutes nonconformance with the Standard.
2.2 References
Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix I, which is part of this Standard.
9 INSPECTION TOLERANCE
9.1 Convention
For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum and minimum values) are specified shall be as defined in ASTM E29. This requires that an observed or calculated value be rounded off to the nearest unit in the last right-hand digit used for expressing the limit.
Decimal values and tolerances do not imply a particular method of measurement.
9.2 Linear Dimensions
An inspection tolerance, as shown in Table 9.2-1, shall be allowed on center-to-shoulder, center-to-center, center-to-threaded-end, and shoulder-to-threaded-end dimensions on all fittings having internal (C) braze ends, as well as on center-to-braze-end and braze-end- to-threaded-end dimensions on all fittings having external (FTG) braze ends. Coupling inspection limits for shoulder- to-shoulder and shoulder-to-end dimensions shall be double those shown in Table 9.2-1, except that the minus tolerance applied to dimension L (Figure 4.1-1) shall not result in a dimension less than 1.5 mm (0.06 in.). The largest opening in the fitting shall govern the tolerance to be applied to all openings.
9.3 Ovatity of Fitting End (C or FTG)
Maximum ovality of the fitting braze-joint end shall not exceed 1% of the maximum diameters shown in Table 3.1-1. The average of the maximum and minimum diameters shall be within the dimensions shown in the table.
9.4 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 3.1-1. The out-of-roundness condition of the cross-sectional area shall not exceed the value shown in Table 3.1-1.
For reducer or adapter fittings, the smallest end diameter shall apply, provided that this diameter does not restrict the other outlets.
9.5 WaLL Thickness
The minimum wall thickness shall not be less than shown in Table 3.1-1.
10 THREADED ENDS
Fitting threads shall be right-hand, conforming to ASME B1.20.1. They shall be taper threads (NPT).
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 chamfering shall be concentric with the threads.
The length of threads shall be measured to include the countersink or chamfer.