ASME B16.18-2012 pdf – Cast Copper Alloy Solder Joint Pressure Fittings.
(a) Castings intended for use in applications up to 400°F (204°C) shall beo(a copper .ilkw produced to meet
(1) thc requirement of ASTM 1162 Alloy CK36(X)
(2) the tensile requirements of ASTM B584 AIk C8381X) or C84400 and in aN other respects comply with the requirements of ASTM 1162
(b) Castings intended for use in potable water appbcations, up to 200°F (93°C), shall be either
(I) of a copper alloy produced to meet the requiremrnts of ASTM Bl43 Alloy CS7II5tI or C119t133, or
(2) of other cast copper alloys, provided the fittings produced meet mer h.anic-al and cwrnsmn-rrsistant properties needed for potable water application
I)imensuinal vañahons uccur in the casting prizess. Pattern equipment shall be designed to produce the metal thickness given for fittings in Table 3 or Table (-3. The minimum wall-thickns-n shall not be less than Sk) of the lxidy and point wall-thickness as shown in Table I or Table 1-3.
8.1 Convention
For determining conformance with this Standard, the convention for using significant digits where limits (masimum 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 nght.hand digit used lot expressing the hind. Decimal values and tolerances do not imply a parhcular method of measurement.
8.2 Linear Dimensions
An inspection tolerance as shown in Table 2 shall be allowed on center-to-shoulder, center-tsseenter, centerto-threaded end, and shoulder-to-threaded end dimensions 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-lu-shoulder and shoulder-b-end dimensions shall be double those shown in Table 2, except that the minus tcikraneeapphrd to dimensions M. N, and WV. and Tables 7 and 1-7 shall nob result in a dimension less than 0.06 in. (15 mm) for sizes i through tin., 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 .111 openings.
Tables 3 through 19 and Tables 1-3 through 1-19 offer dimensions lot pressure fittings covered 1w this Standard
8.3 Ovakty
Maximum ovality shall not exceed 1% of the maximum dtarncters shown in Table 3 Thlc 1-3. The average of the maximum and minimum dlametrrs must be within the dimensions shown in the table.
8.4 Gaging of Solder Joint Ends
8,41 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 Gptional Gaging Method. For gaging the diameter tolerance of male and female ends, the menufacturer 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 pa. $3.
85 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 Ill .20.1.
8.6 Alignment
The maximum-allowable deviation in the angular alignment of any opening shall be 0.06 in/ft (5mm/m) (0.5%).
9.1 Thread Type
Fitting threads shall be right hand, conforming to ANS1/ASME 8120.1. Pipe Threads. General Purpose (Inch). They ,hall 1w taper threads (NIT).
9.2 Countersink at Chamfer
All internal threads shall be countersunk a distance not lese 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 trom the axis, for easier entrance in making a )isnt and protection of the thread. Countersinking and chamfering shall be concentric with the threads.