ASME B16.39:2019 pdf free download

ASME B16.39:2019 pdf free download.Malleable lron Threaded Pipe Unions.
(d) The temperatures shown for the corresponding pressure rating shall be the material temperature of the pressure-retaining structure. It may be assumed that the material temperature is the same as the fluid temperature. Use of a pressure rating at a material temperature other thaii that of the contained fluid is the responsibility of the user and sub)ect to the requirements of any applicable code.
4 SIZE
4.1 NominaL Pipe Size
As applied in this Standard, the use of the phrase nominal pipe size” or the designation NPS followed by a dimensionless number is for Identifying the end connection of unions. The number Is not necessarily the same as the fitting inside diameter. The connecting pipe dimension can be found In ASME B36.IOM.
5 MARKING
Unions shall be marked on the nut with the manufacturer’s name or trademark and nominal pressure dass except on bar stock unions, where marking is Impractical. Additional markings permitted by MSS SP-25 may be used.
6 MATERIALS
(a) The mechanical properties of the malleable iron castings shall be at least equal to those specified in
ASTM A197/A197M.
(b) Steel bar stock having a yield strength not less than 207 MPa (30 ksi) may be substituted for malleable iron in NPS ‘/ unions.
(c) Insert rings may be of suitable copper or copper alloy. Where copper-alloy seats are furnished, either the head or tail part of unions produced from bar stock may be solid copper alloy. Such parts must meet the tensile strength requirements listed in Table 6.1.
7 JOINTS AND SEATS
Inserts shall be secured into the ends permanently with no signs of cracking. Inserted seat rings shall be of suffi. dent width to allow ample beanng for the seating of the male end.
8 THREADING OF PIPE ENDS
8.1 Types of Threads
Pipe ends of head and tail parts shall he threaded with taper pipe threads (ASME H1.20.l) except that NPS ‘4, unions made from bar stock may have National Pipe Straight Coupling (NPSC) internal straight pipe threads.
11 AIR-PRESSURE TEST
Assembled unions selected in accordance withsection 12 shall be tested with air at a minimum pressureof 2.8 bar [40 psi)].
12 SAMPLING FOR AIR-PRESSURE TEST
random sample of unions representative of theproduction lot shall be submitted for testing in accordancewith section 11.The average outgoing quality level(AOQLJ. as defined in ANSI/ASQ Z1.4, of the establishedacceptable sampling plans used shall not exceed 2%.A lot,for purposes of this Standard, is defined as the number ofunions of the same size,design, and pressure ratingsubmitted for testing at any one time.