Common use of Flow Elements Clause in Contracts

Flow Elements. Orifice Plates Orifice plates of the square-edged concentric type shall be specified except where unsatisfactory for the application. Plate dimensions shall conform to ASME MFC-3M. Weep holes shall be provided in steam and gas flow installations where there is possible condensation or in liquid flow where there is possible gas entrainment. Materials shall normally be Type 304 stainless steel unless special materials are required for the service. For gas and vapor service, the differential pressure range in inches of water normally shall not exceed the static absolute pressure in psia. Orifice bores will be calculated using ASME MFC-3M and ISO 5167. Flange taps shall normally be used in accordance with ASME MFC-3M. For special alloys and 14-inch-and-larger pipe sizes, in 150-psi classification, throat taps may be used. One-half-inch NPT is the normal tap size for 300 psi through 600 psi flange rating. Three-quarter-inch is the tap size for 900 psi through 2,500 psi flange rating. Where threaded connections are not permitted by the pipe class, socket weld connections shall be used. The minimum orifice flange rating shall be 300 psi ANSI except for lines 14 inches and larger, where 150 psi ANSI is the minimum. The use of higher rated flanges, or of facing type, shall be as called for in piping specifications. Ring-type plate holders shall be manufacturer's standard plate mounting. Ring facing shall be oval ANSI standard unless otherwise required by piping specifications. Orifice taps for horizontal pipe runs shall normally be oriented horizontal for clean liquids and steam, and vertical-up for gases. Venturi tubes, low-loss tubes, and flow nozzles shall be used where high-pressure recovery is necessary and/or where only low inlet pressure is available. Averaging pitot tubes shall be used where the pipe diameter is too large for acceptable orifice plate design in applications such as pump minimum flow bypass control, or where normal straight pipe requirements are not met. The element may have two pipe diameters of straight pipe upstream and downstream mounted in a plane parallel to the maximum disturbance. Other types of flow elements should be considered where their use is desirable and the above-mentioned elements are not applicable. Integral orifice meters (combination primary element-measuring device) shall normally be used for meter runs of less than 1.5 inches with a suitable strainer upstream of the meter. Eccentric type orifice plates shall be used for fluids containing two phases. The eccentric-type orifice plates shall have the bottom of the orifice bore flush with the bottom ID of the pipe. Eccentric orifice plates shall be used only in horizontal runs.

Flow Elements. Orifice Plates Orifice plates of the square-square edged concentric type shall be specified except where unsatisfactory for the application. Plate dimensions shall conform to ASME MFC-3M. Weep holes shall be provided in steam and gas flow installations where there is possible condensation or in liquid flow where there is possible gas entrainment. Materials shall normally be Type 304 stainless steel unless special materials are required for the service. For gas and vapor service, the differential pressure range in inches of water normally shall not exceed the static absolute pressure in psia. Orifice bores will be calculated using ASME MFC-3M and ISO 5167. Flange taps shall normally be used in accordance with ASME MFC-3M. For special alloys and 14-inch-and-larger pipe sizes, in 150-150 psi classification, throat taps may be used. One-half-inch NPT is the normal tap size for 300 psi through 600 psi flange rating. Three-quarter-inch is the tap size for 900 psi through 2,500 psi flange rating. Where threaded connections are not permitted by the pipe class, socket weld connections shall be used. The minimum orifice flange rating shall be 300 psi ANSI except for lines 14 inches and larger, where 150 psi ANSI is the minimum. The use of higher rated flanges, or of facing typeother than raised face, shall be as called for in piping specifications. Ring-Ring type plate holders shall be manufacturer's standard plate mounting. Ring facing shall be oval ANSI standard unless otherwise required by piping specifications. Orifice taps for horizontal pipe runs shall normally be oriented horizontal for clean liquids and steam, and vertical-up for gases. Venturi tubes, low-low loss tubes, and flow nozzles shall be used where high-pressure recovery is necessary and/or where only low inlet pressure is available. Averaging pitot tubes shall be used where the pipe diameter is too large for acceptable orifice plate design in applications such as pump minimum flow bypass control, or where normal straight pipe requirements are not met. The element may have two pipe diameters of straight pipe upstream and downstream mounted in a plane parallel to the maximum disturbance. Other types of flow elements should be considered where their use is desirable and the above-mentioned elements are not applicable. Integral orifice meters (combination primary element-measuring device) shall normally be used for meter runs of less than 1.5 1-1/2 inches with a suitable strainer upstream of the meter. Eccentric type orifice plates shall be used for fluids containing two phases. The eccentric-eccentric type orifice plates shall have the bottom of the orifice bore flush with the bottom ID of the pipe. Eccentric orifice plates shall be used only in horizontal runs.