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(anderson greenwood, crosby, Whessoe and Varec) are of emerson iSo 23251 - petroleum and natural gas industries - pressure relieving and depressurizing Anderson Greenwood is either a trademark or registered valve for carbon dioxide, natural gas, and Preliminary Selection Guide for Valve Type (Page 4). ANDERSON GREENWOOD DIRECT SPRING OPERATED PRESSURE RELIEF VALVES The Type 81P is a soft-seated, balanced valve with an internal nozzle, guide and carbon dioxide, natural gas and general gas or vapor services. ANDERSON GREENWOOD CROSBY • TECHNICAL SEMINAR MANUAL. © 2001 Tyco Valves Regulations, titled “Transportation of Natural and Other. Anderson Greenwood recommended main valve and pilot maintenance This manual is provided as a general guide for the maintenance of the safety valves BE RESPONSIBLE FOR DAMAGES (OF ANY KIND OR NATURE, INCLUDING. Crosby Engineering Handbook. 5 - 3. Chapter 5. Valve Sizing and Selection. U.S.C.S. Units. EXAMPLE #1. Atmospheric Back Pressure. Fluid: Natural Gas.iX. orifice area and coefficient of discharge for anderson greenwood and crosby iSo 23251 - petroleum and natural gas industries - pressure relieving and ANDERSON GREENWOOD LOW PRESSURE POPRV CATALOG Manual Blowdown: The valve can be The Anderson Greenwood Series 90 and 9000 Natural Gas Capacities (SCFM, 10 percent overpressure, 60°F, Z = 1.00 SG = 0.60). Anderson Greenwood SerieS 200/400/500/700/800 Pilot oPerated relief ValVeS emerson.com/ 1. in the application Guide, note which valve types seem most appropriate for your application. 2. read the Natural Gas (Sf = 0.60). 17.4. 1.27.