Flange faces, dimensions

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. 

RP4.1 Uniform Face-to-Face Dimensions for Flanged Control Valve Bodies... 

API Standard 526, Flanged Steel Pressure Relief Valves This is a purchase specification for flanged steel PRVs. Basic requirements, such as orifice designations and area, materials, pressure-temperature limits and centre-to-face dimensions, inlet and outlet, are given for both spring-operated and pilot-operated PRVs (Figure 4.13). 

ANSI B16.1 gives face-to-face dimensions of iron flanged and welding-end valves and includes cast iron and steel gate, globe, angle, and swing check valves in various sizes and pressures. 

A valve list is often made to include the numerical order and their face-to-face dimensions of the valves used and other data such as ANSI flange ratings. 

Maintenance located a 12 in. 300 psi RF check valve that was used on firewater pumps, but not on hydrocarbons. This substitute valve was manufactured to a Japanese flange to flange standard dimensioa The Japanese standard face to face dimensions are more compact than the ANSI standard so the storeroom stocked this valve with a connecting short spool piece of 12 in. piping (see Fig. 2.27 to imderstand the dimension). 

A dummy-block is placed against the face of the extrusion ram. For the extrusion of rods the dummy-block is centered on a bolt being inserted in the solid ram and for the extrusion of tubes by means of a hollow ram, on the mandrel. The transition from the cylindrical part of the ram to its flange takes a tapered form. The bearing surface of the flange is dimensioned for a permissible specific unit pressure of about 4,000 kg/cm-. The area of the thrust ring which transmits the ram power to the cross-head, is dimensioned for a surface loading of about 1,500 to 2,000 kg/cm. On account of its stress-concentration index the surface and the central... 

For flanges of nonstandard dimensions or for sizes beyond the scope of the approved standards, design shall be in accordance with the requirements of the ASME Boiler and Pressure Vessel Code, Sec. T11, except that requirements for fabrication, assembly, inspection testing, and the pressure and temperature hmits for materials of the Piping Code are to prevail. Countermoment flanges of flat face or otherwise providing a reaction outside the bolt circle are permitted if... 

The theoretical distance to the dividing streamline, X, is a function of hood dimensions, hood face velocity, distance parallel to the hood face, and crossdraft velocity, and is calculated from the equations for flanged elliptical openings in Section 10.2.2.2. 

ASME B16.34-2004 Valves, flanged, threaded and welding end ASME B16.10-2000 Face-to-face and end-to-end dimensions of valves ASME B31.1-2004 Power piping ASME B31.2-1968 Fuel gas piping ASME B31.3-2004 Process piping... 

ANSI B16.5 includes ring-joint dimensions and facing for steel flanges and flanged fittings. 

Standard flanges arc available with a variely of machined faces, as shown in Fig. 12.7 (corresponding dimensions are given in Table 12.2). 

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