Socket welding

Valve bodies are also standardized to mate with common piping connections flanged, butt-weld end, socket-weld end, and screwed end. Dimensional information for some of these joints and class pressure-temperature ratings are included in Sec. 10, Process Plant Piping. Control valves have their own standardized face-to-face dimensions that are governed by ISA Standards S75.03, 04, 12, 14, 15, 16, 20, and 22. Butterfly valves are also governed by API 609 and Manufacturers Standardization Society (MSS) SP-67 and 68. 

Plain-end pipe used for socket-weld joints (Fig. 10-126) is available in all sizes, but fittings and valves with socket-weld ends are limited to sizes 3 in and smaller, for which the extra cost of the socket is outweighed by much easier alignment and less skill needed in welding. The joint is not so resistant to bending stress as the butt-welded joint but is otherwise equal, except that for some fluids the crevice between the pipe and the socket may promote corrosion. ANSI B16.il—1973,... 

Forged Steel Fittings, Socket-Welding and Threaded, requires that the wall thickness of the socket must be equal to or greater than 1.25 times the minimum pipe wall. 

Threaded slip-on socket welding Lap joint Welding neck ANSIB16.1, screwed (125-lh)... 

Forged fittings made by boring out sohd forgings are available with socket-weld (Fig. 10-126) or with screwed ends in sizes through 4 in, but 2 in is the usual upper size hmit for use. ANSI B16.il—1973 gives minimum dimensions for socket-weld 3000- and 6000-lb classes and... 

L-shaped pipe section of 2 in. (5 cm) carbon steel pipe socket welded to a 90° carbon steel elbow... 

No socket welding or other pockets that can accumulate dirt downstream of filter. 

Pipe, valve, and fittings tables must specify which size of each class of pipe is threaded, flanged, or socket welded. ANSI B31.3 provides no specific guidance except that it suggests that threads be avoided where corrosion, severe erosion, or cyclic loading is anticipated. 

GENERAL MATERIAL MAXIMUM DESIGN PRESSURE and TEMPERATURE LIMITS UMITED BY CORROSION ALLOWANCE CONSTRUCTION Carbon Steel 275 PSIG at -20/I00°F 100 PSIG at 750°F 150 Flanges See Table, This Spec. ly" and Smaller—Socket Welded 2" and Larger—Flanged and Butt-Welded... 

FITTINGS ly" and smaller 3000 F.S., Socket Weld, ASTM-A105 Gr. I or II... 

FLANGES ly" and smaller 130 ASA, y" R.F., Socket Weld ASTM-A181 Gr. 1... 

Socket Weld ASA B16.11. Steel to Steel Seats, Ground Joint. No Bronze... 

T)pe Socket Weld Ends, F.S., ASTM-A105 Gr. II VCH-312, 800, Combination Horizontal Vertical Ball Type, Socket Weld Ends, F.S., ASTM-A105, Gr. II... 

Figure 2-4B. Forged steel socket weld fittings, WOG (water, oil or gas service). Note the working pressures are always well above actual plant operating levels and are heavy to allow for welding. Pressure classes 3000 psi and 6000 psi, sizes % in. through 4 in. nominal. Do not weld on malleable iron or cast Iron fittings. (By permission, Ladish Co., Inc.)...

Sockoleb utilizes the basic Weldoli i ( ign configuration and incorporates a socket-weld outlet. 

LatroletV used for 45 lateral cor -. )ns, is available butt weld to meet your specific i forcement requirements, and I or > classes for socket weld and threaded applications. 

Figure 2-21. Equivaient iength of fittings for pipe systems. Note preferred use for 1 / in. and larger pipe butt-welded or socket-welded connections (this author). By permission. Tube Turns Div., Chemitron Corp. Bull. TT 725,1952, reference now to Tube Turns Technologies, Inc.

Socket weld pipe connections straight type... 

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