ASME B16.18-2001 pdf download

ASME B16.18-2001 pdf download.CAST COPPER ALLOY SOLDER JOINT PRESSURE FTTINGS.
1.2 Units of Measurement
The values stated in either U.S. Customary (inch- lb.) or SI (metric) units of measure shall be regarded separately as standard. Within the main text, U.S. Customary units are given. For convenience, the SI units arc shown in parentheses and in Nonmandatory Annex B. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.
NOTE: Combining values from the two systems may result in nonconformance with Ihe Standard.
1.3 Convention
For the purpose of determining conformance with this Standard, the convention for fixing significant digits rherc units, maximum or minimum values, are specified
shall be ‘rounding off’ as defined in ASTM Practice E 29. This requires that an observed or calculated value shall be rounded off to the nearest unit in the last right-hand digit used for expressing the limit.
8 INSPECTION TOLERANCE
8.1 Linear Dimensions
An inspection tolerance as shown in Table 2 shall he allowed on center-to-shoulder, center-to-center, center-to-threaded end, and shoulder-to-threaded end dimensions on all fittings having tmale solder (solder cup) ends, and on center-to-solder end and solder-to- threaded end dimensions on all fittings having male solder (fitting) ends.
Coupling inspection limits for shoulder-to-shoulder and shoulder-to-end dimensions shall be double those shown in Table 2, except that the minus tolerance applied to dimensions M, N, and W, and Tables 7 and B7 shall not result in a dimension less than 0.06 in. (1 .5 mm) for sizes 1/4 through I in., inclusive, or a dimension less than 0.09 in. (2.3 mm) for the larger sizes.
The largest opening in the fitting governs the tolerance to be applied to all openings.
Tables 3 through 19 offer dimensions for pressure fittings covered by this standard.
8.2 Ovality
Maximum ovality shall not exceed 1% of the maximum diameters shown in Table 3 or Table B3. The average of the maximum and minimum diameters must he within the dimensions shown in the table.
8.3 Gaging of Solder Joint Ends
8.3.1 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 B3.
8.3.2 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. 8.3.1. When gaging the diameters of male and female ends using direct reading instruments, refer to para. 8.2.
8.4 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 ASME Bl.20.l.