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CONTROL AND HYDRAULIC RESEARCH OF THE UNIVERSITY <br /> OF SOUTHERN CALIFORNIA. <br /> 3 . A DUAL CHECK CONSISTS OF INDEPENDENTLY ACTING , <br /> SPRING - LOADED CHECK VALVES IN A CORROSION <br /> RESISTANT MATERIAL . DUAL CHECKS USUALLY HAVE TO BE <br /> REMOVED FOR TESTING . THEY ARE NOT RECOMMENDED <br /> FOR HIGH HAZARD CONDITIONS , THIS DEVICE MUST MEET <br /> ASSE STANDARD # 1024 AND BE APPROVED BY THE <br /> FOUNDATION FOR CROSS CONNECTION CONTROL AND <br /> HYDRAULIC RESEARCH OF THE UNIVERSITY OF SOUTHERN <br /> CALIFORNIA. <br /> 4 , A DOUBLE CHECK VALVE ASSEMBLY CONSISTS OF TWO <br /> POSITIVE-SEATING CHECK VALVES INSTALLED AS A UNIT <br /> BETWEEN TWO RESILIENT- SEATED SHUTOFF VALVES AND <br /> FITTED WITH PROPERLY LOCATED TEST COCKS . THIS <br /> DEVICE MUST MEET ASSE # 1015 AND BE APPROVED BY THE <br /> FOUNDATION FOR CROSS CONNECTION CONTROL AND <br /> HYDRAULIC RESEARCH OF THE UNIVERSITY OF SOUTHERN <br /> CALIFORNIA . <br /> 5 , A REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTER <br /> CONSISTS OF TWO POSITIVE-SEATING CHECK VALVES AND <br /> AN AUTOMATICALLY- OPERATING PRESSURE <br /> DIFFERENTIAL RELIEF VALVE INTEGRALLY LOCATED <br /> BETWEEN THE TWO CHECK VALVES , INSTALLED AS A UNIT <br /> BETWEEN TWO TIGHTLY CLOSING , RESILIENT-SEATED <br /> SHUTOFF VALVES AND FITTED WITH PROPERLY LOCATED <br /> TEST COCKS , THIS DEVICE MUST MEET ASSE STANDARD <br /> # 1013 AND BE APPROVED BY THE FOUNDATION FOR CROSS <br /> CONNECTION CONTROL AND HYDRAULIC RESEARCH OF <br /> THE UNIVERSITY OF SOUTHERN CALIFORNIA. <br /> FILTERS AND STRAINERS <br /> A. USE FILTRATION EQUIPMENT AND STRAINERS CONSTRUCTED <br /> OF MATERIALS RESISTANT TO THE POTENTIAL CORROSIVE AND <br /> EROSIVE EFFECTS OF THE WATER , AND SIZED IN ACCORDANCE <br /> WITH THE MANUFACTURER' S RECOMMENDATIONS , <br /> B . USE THE EQUIPMENT THAT IS CONSTRUCTED OF MATERIALS <br /> CAPABLE OF WITHSTANDING THE POTENTIAL MECHANICAL <br /> DAMAGE CAUSED BY CONTAMINANTS ( FOR EXAMPLE , SAND ) IN <br /> THE WATER , <br /> C . THE FILTER ELEMENT , STRAINER , OR FILTRATION MEDIA MUST <br /> BE SIZED TO PREVENT THE PASSAGE OF FOREIGN MATERIAL IN <br /> SIZES OR QUANTITIES WHICH WOULD OBSTRUCT THE <br /> SPRINKLER/ EMITTER OUTLETS , TYPICALLY 1 /4 THE DIAMETER <br /> OF THE SMALLEST OUTLET OR THE MESH SIZE RECOMMENDED <br /> BY THE EMITTER MANUFACTURER , <br /> F:\Engineering\Special Projects\Eagle Trace Phase 2\Contract Documents\Eagle Trace Subdivision Phase <br /> II\IRRIGATION SPECIFICATIONS from W. F . McCain . doc _ 5 <br />