ASME B16.18-2012 pdf download
ASME B16.18-2012 pdf download.Cast Copper Alloy Solder Joint Pressure Fittings.
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 SI units are shown in parentheses or in separate tables that appear in Mandatory Appendix I. 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 II, which is part of this Standard. It is not considered practical to identify the specific edition of each standard and specification in the individual references. Instead, the specific edition reference is identified in Mandatory Appendix TI.
2.3 Quality System
Requirements relating to the product manufacturer’s quality system programs are described in Nonmandatory Appendix C.
3 PRESSURE—TEMPERATURE RATINGS
3.1 Rating of Fitting and of Joint
The internal pressure—temperature ratings of the fittings are shown in Table 1.
The internal pressure—temperature rating for a solder joint fitting is dependent not only on fitting and tube strength, but also on the corn position of the solder used for the joint and selection of valves and appurtenances. The internal pressure—temperature rating of the system shall be the lowest of the values shown in Table 1, the solder joint, and those of the tube, valves, or appurtenances.
8.3 OvaLity
Maximum ovality shall not exceed 1% of the maximum diameters shown in Table 3 or Table 1-3. The average of the maximum and minimum diameters must be within the dimensions shown in the table.
8.4 Gaging of Solder Joint Ends
8.4.1 Standard Gaging Method. The standard method of gaging the diameter tolerances for male and female ends shall be by the use of plain plug and ring gages designed to hold the product within the limits established in Table 3 or Table 1-3.
8.4.2 Optional Gaging Method. For gaging the diameter tolerance of male and female ends, the manufacturer may use direct reading instruments instead of ring and plug gages as specified in para. 8.4.1. When gaging the diameters of male and female ends using direct reading instruments, refer to para. 8.3.
8.5 Standard Gaging Method of Threaded Ends
The standard method of gaging the external and internal threaded ends shall be in accordance with the requirements of ANSI/ASME B1.20.1.
8.6 Alignment
The maximum-allowable deviation in the angular alignment of any opening shall be 0.06 in./ft (5 mm/rn) (0.5%).
9 THREADED ENDS
9.1 Thread Type
Fitting threads shall be right hand, conforming to ANSI/ASME B1.20.1, Pipe Threads, General Purpose (Inch). They shall be taper threads (NPT).
9.2 Countersink or Chamfer
All internal threads shall be countersunk a distance not less than one-half the pitch of the thread at an angle approximately 45 deg with the axis of the thread, and all external threads shall be chamfered at an angle of 30 deg to 45 deg from the axis, for easier entrance in making a joint and protection of the thread. Countersinking and chamfering shall be concentric with the threads.
9.3 Threading Tolerances
Tolerance for an internal threaded end having an internal shoulder shall be from the gage reference point.
