ASME B16.18:2012 pdf free download

ASME B16.18:2012 pdf free download
ASME B16.18:2012 pdf free download.Cast Copper Alloy Solder Joint Pressure Fittings
8.1 Convention
For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum or 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.
8.2 Linear Dimensions
An inspection tolerance as shown in Table 2 shall be allowed on center-to-shoulder, center-to-center, center- to-threaded end, and shoulder-to-threaded end dimen- sions on all fittings having female 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 I-7 shall not result in a dimension less than 0.06 in. (1.5 mm) for sizes 1 ⁄ 4 through 1 in., inclusive, or a dimension less than 0.09 in. (2.3 mm) for the larger sizes.
8.3 Ovality
Maximum ovality shall not exceed 1% of the maxi- mum diameters shown in Table 3 or Table I-3. The aver- age 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 I-3.
8.4.2 Optional Gaging Method. For gaging the diameter tolerance of male and female ends, the manu- facturer 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 inter- nal threaded ends shall be in accordance with the requirements of ANSI/ASME B1.20.1.