ASME B16.26:2018 pdf free download – Cast Copper Alloy Fittings for Flared Copper Tubes
1 SCOPE
This Standard establishes specifications for castcopper alloy fittings and nuts used with flared seamless copper tube conforming to ASTM B88 (water and general plumbing systems). Included are requirements for the following:
(a) pressure ratings
(b) size
(c) marking
(d) material
(e) dimensions
(f) threading
(g) hydrostatic testing
2 GENERAL
2.1 References
Codes, standards, and specifications containing provi-sions to the extent referenced herein constitute require-ments of this Standard. These reference documents are listed in Mandatory Appendix I.
2.2 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 orcalculatedvalueberoundedofftothenearestunitinthe lastright-hand digitused forexpressingthe limit. Decimal values and tolerances do notimply a particular method of measurement.
2.3 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 U.S. Customary units are shown in parentheses. 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.
2.5 Service Conditions
Criteria for selection ofmaterials suitable forparticular fluid service are not within the scope of this Standard.
3 PRESSURE RATINGS
The fittings covered by this Standard are designed for a maximum cold-water service pressure of1 200 kPa (175
psig).
4 SIZE
ThesizesofthefittingsshowninTable7.1-1 correspond to standard water tube size as defined in ASTM B88.
5 MARKING
Each fitting shall be marked with the manufacturer’s name or trademark and other applicable markings as required by MSS SP-25. Marking of fittings less than nominal size 1 ∕ 2 is optional.
Fittings manufactured from cast copper alloys containing silicon shall be permanently marked with the designation Si. Fittings manufactured from cast copper alloys containing bismuth shall be permanently marked with the designation B or Bi.
6MATERIAL
(a) Castings intended for use in applications up to 204°C (400°F) shall be ofa copper alloyproduced to meet (1) the requirements of ASTM B62 for copper alloy UNS No. C83600, or (2) the chemical and tensile requirements of ASTM B584 for copperalloy UNS No.C83800 or C84400 and inall other respects comply with the require ments of ASTMB 62
(b) Castings intended for use in potable water applica-tions up to 93°C (200°F) shall be low lead (0.25% or less)
and shall be (1) of a copper alloy produced to meet the require-ments ofASTM B584 for copper alloy UNS No. C87850 or C89833, or
(2) ofother cast copper alloys, provided the fittings produced meet mechanical and corrosion-resistant prop-erties needed for potable water application
8 THREADING
Straight threads shall conform to ASME B1.1 Class 2A external and Class 2B internal. The dimensions ofstraight threads are given in Tables 8-1 and 8-2. Taper pipe threads (NPT) shall conform to ASME B1.20.1.