API 600-2001 pdf free download
API 600-2001 pdf free download.Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries.
3 Definitions For the purposes of this International Standard, the definition of nominal size given in ISO 6708 and of nominal pressure given in ISO 7268 apply. Alternatively, the definitions of pressure Class and Nominal Pipe Size given in ANSI/ASME B1 6.34 apply. 4 Pressure/temperature ratings 4.1 The pressure/temperature ratings applicable to the valves specified in this International Standard shall be in accordance with those specified in the tables of ASME B1 6.34 for Standard Class for the applicable material specifi- cation and the applicable Class (PN). Restrictions on temperature and pressure conditions, for example, those imposed by special soft seals or special trim materials shall be marked on the valve identification plate (see 8.4). 4.2 The temperature for a corresponding pressure rating is the maximum temperature of the pressure-containing shell of the valve. In general, this temperature is the same as that of the contained fluid. The use of a pressure rat- ing corresponding to a temperature other than that of the contained fluid is the responsibility of the user. 4.3 For temperatures below the lowest temperature listed in the pressure/temperature tables (see 4.1 ), the ser- vice pressure shall be no greater than the pressure for the lowest listed temperature. The use of valves at lower temperatures is the responsibility of the user. Consideration should be given to the loss of ductility and impact strength of many materials at low temperature. 5 Design 5.1 Body wall thickness 5.1.1 A valve body schematic is shown in Figure 1 . The minimum body wall thickness, t m , at the time of manufac- ture shall be as given in table 1 , except as indicated in 5.1 .2 for butt-welding valve ends. Additional metal thickness needed for assembly stresses, stress concentrations, and shapes other than circular shall be determined by indi- vidual manufacturers since these factors vary widely.
5.5.9 At assembly, all gasket contact surfaces shall be free of heavy oils, grease and sealing compounds. A light coating of a lubricant, no heavier than kerosene, may be applied if needed to assist in proper gasket assembly. 5.6 Gate 5.6.1 Gate configurations are categorized as illustrated in Annex B. 5.6.1.1 A one-piece wedge gate, as either a solid or flexible wedge design, shall be furnished unless otherwise specified. 5.6.1.2 A two-piece split wedge gate or parallel seat double disc gate may be furnished when specified. A split wedge gate consists of two independent seating parts that conform to the body seats when closed. A double disc gate has a spreading mechanism that forces the two parallel discs to the body seats when closed. 5.6.2 Except for a double disc gate, in the open position, the gate shall completely clear the valve seat openings. 5.6.3 Gates shall be designed so that all parts can function properly independent of the installed valve orientation. 5.6.4 Guides shall be provided in the gate and the shell and shall be designed so as to minimize seat wear and maintain gate to stem alignment in all valve orientations. Gate-to-shell design shall consider wear that may be caused by corrosion, erosion and abrasion. 5.6.5 Gate seating surfaces shall be integral or faced with weld metal. Unless specified, hard faced seating sur- faces are not required. Finished thickness of any facing material shall be not less than 1 ,6 mm. 5.6.6 Wedge gates shall be designed to account for seat wear. The dimensions that fix the position of the gate seats relative to the body seats shall be such that the gate, starting from the time of manufacture, can move into the seats, as a result of seat wear, a distance defined as wear travel. The required minimum wear travel varies with valve size, as given in table 5.
