1) ASME Boiler & Pressure Vessel Code 2013 Edition SECTION VIII Rules for Construction of Pressure Vessels Division 1
UW-21 ASME B16.5 SOCKET AND SLIP-ON FLANGE WELDS
2) ASME B31.1-2014 Power Piping
Fig. 127.4.4(B) Welding Details for Slip-On and Socket-Welding Flanges; Some Acceptable Types of Flange Attachment Welds
Fig. 127.4.4(C) Minimum Welding Dimensions Required for Socket Welding Components Other Than Flanges
3) ASME B16.11-2011 Forged Fittings, Socket-Welding and Threaded