ASME B16.1:2015 pdf download.Standardization of Valves, Flanges, Fittings, Gaskets, and Valve Actuators.
7.8 Crosses and Lateral Reinforcement
C rosses and laterals (Y-branches) both straight and reducing shall be reinforced where necessary to corn pen- sate for the inherent weakness in the shape of these fittings.
79 Drain Connections
7.9.1 Threaded Connections. H oles may be drilled and tapped in the wall of fittings if the metal thickness is sufficient to provide the effective length of thread as shown in FIg. 2 and as specified in Table 10. Where thread length is insufficient due to metal thickness or size of tapping is such that reinforcement of opening is necessary, an integral boss should be added. In no case shall the effective length of thread A be less than that shown in Table 10. These lengths are e ual to the effective thread lengths as shown in ASME B1.20.1.
7.9.2 Location Designation. The method of designating the locations of the tapped holes for drains Is shown in Fig. 3. Each location is designated by a Letter so that desired locations for the various types of fittings may be definitely specified without the use of further sketches or description. For further tapping details, see
MSS SP-45.
8 BOLT, NUT, AND GASKET DIMENSIONS
8.1 Bolting (15)
(a) All bolting materials shall haves uare, heavy hex, or hex heads and s uare, heavy hex, or hex nuts with full flat bearing faces as specified in ASME B18.2.1 for bolts and A SM E B 18.2.2 for nuts. Threads shall be U N C or UN 8 and have a thread fit class of 2A for bolts and 2B for nuts. Washer faced bolts or washer faced nuts are prohibited.
(b) Carbon steel boLts 1 in. and smaller shall have s uare heads (ASME B18.2.1) or heavy hex heads (A SM E B18.2.1) and shall have s uare or heavy hex nuts (ASME B18.2.2).
(c) Carbon steel bolts 11/8 in. and larger shall have s uare heads (ASME B18.2.1), hex heads (A SM E B18.2.1), or heavy hex heads(A SM E B18.2.1) and shall have hex nuts (ASME B18.2.2) or heavy hex nuts (ASME B18.2.2) or s uare nuts(ASME B18.2.2). For bolt sizes 11/2 in. and larger, stud bolts with a nut on each end are recommended.
8.2 Gaskets (15)
It is recommended that flat ring gaskets be in accordance with dimensions given in ASME B16.21 for nonmetallic gaskets for pipe flanges. Flanges of CLassA iron should not be used with gaskets having a gasket factor ( M as defined in ASME Section VIII, Rules for Construction of Pressure Vessels, Division 1, Mandatory Appendix 2) greater than 2.75.ASME B16.1 pdf download.