ASME B16.50-2021 pdf – Wrought Copper and Copper Alloy Braze-Joint Pressure Fittings.
2.3 QuaLity Systems
Requirenients relating to the product manufacturer’s Quality System Programs are described In Noninandatory Appendix B.
3.1 RatIng ot System
The internal pressure—temperature rating for a braze joint system is dependent on not only fitting and tube strength but aLso selection of valves arid appurtenances. Pressure—temperature ratings for fittings and braze joints to the dimensions of Table 3.1-1. made with typical commercial brazing materials, shall be considered equal to the values given in Table 3.1-2.
The internal pressure-temperature rating of the system shall be the lowest of the values shown In Table 3.1-2 and those of the tube, valves, or appurtenances.
3.2 Fitting Bursting Strength
Fittings manufactured to this Standard shall have an ambient-temperature bursting strength of at least 4 times the 38°C (100°F) Internal pressure rating as shown in Table 3.1-2.
4.1 SIze
The size of the fittings shown in Table 3.1-1 corresponds to standard water tube size as shown in ASTM 888. The slzeoIthe threaded ends corresponds to nominal pipe size as shown in ASME BI .20.1. Fittings are designated by the size of the openings in the sequence illustrated in Figure
4.2 Abbreviations
The following symbols are used to designate the type of fitting end:
C braze joint fitting end made to receive copper tube diameter (female)
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 olito 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 92-I. 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 OvaLity of Fitting End (C or FTG)
Maximum ovality olthe 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 o 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.
Fitting threads shall be right-hand, conforming to ASME B1.20.1. They shall be taper threads (NPT).