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API Std 600 pdf free download

API Std 600 pdf free download.Steel Gate Valves—Flanged and Butt-welding Ends, Bolted Bonnets.
3.1 class An alphanumeric designation that is used for reference purposes relating to valve pressure/temperature capability, taking into account valve material mechanical properties and valve dimensional characteristics. It comprises the word “Class” followed by a dimensionless whole number. The number following the word “Class” does not represent a measurable value and is not used for calculation purposes, except where specified in this standard. The allowable pressure for a valve having a ”Class” number depends on the valve material and its application temperature, and is to be found in tables of pressure/temperature ratings.4 Pressure/Temperature Ratings 4.1 Pressure/temperature ratings shall be in accordance with those specified in the tables of ASME B16.34 for standard class for the applicable material specification and the applicable class. 4.2 Restrictions of temperature and concurrent pressure, or pressure and concurrent temperature (e.g., those imposed by special soft seals or special trim materials), shall be marked on the valve identification plate (see Section 8). 4.3 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 rating corresponding to a temperature other than that of the contained fluid is the responsibility of the user. 4.4 For temperatures below the lowest temperature listed in the pressure/temperature tables, the service 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. NOTE For valves capable of trapping fluid, resulting in center cavity overpressure, refer to ASME B16.34 for a provision related to this requirement.5.1.2 The weld end preparation in butt-welding end valves (see 5.3.2) shall not reduce the body wall thickness to less than the values specified in 5.1.1 within a region closer than t m to the outside surface of the body neck, measured along the run direction. The transition to the weld preparation shall be gradual and the section shall be essentially circular through the entire length of the transition. Sharp discontinuities or abrupt changes in section in areas that infringe into the transition shall be avoided, except that test collars or bands, either welded or integral, are allowed. In no case shall the thickness be less than 0.77tm at a distance of 2tm from the weld end. 5.2 Bonnet Wall Thickness The minimum bonnet wall thickness at the time of manufacture, except for the neck extension that contains the packing, shall be tm as given in Table 1. For the neck extension, the local minimum wall thickness shall be based on the local diameter, e.g., the inside diameter of the stem bore or packing box bore, and shall be in accordance with the valve body neck rules of ASME B16.34.5.3 Body Dimensions 5.3.1 Flanged Ends 5.3.1.1 Body end flanges shall comply with the dimensional requirements of ASME B16.5 for sizes up to and including DN 600 (NPS 24). For sizes over DN 600 (NPS 24), body end flanges shall comply with the dimensional requirements of ASME B16.47 Series A or Series B as specified by the purchaser. Unless otherwise specified, raised face end flanges shall be provided. The purchaser may specify a flange facing finish other than that specified in ASME B16.5 or ASME B16.47, as applicable.API Std 600 pdf download.

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