2025-127-E-AMS-Comfort Systems USA (Mid Atlantic) LLC-Sportsplex Pool HVAC Unit Replacement

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OC Sportsplex Pool HVAC Unit Replacement PDC Project 23022 Hydronic Piping 23 21 13 - 5 3.Subject piping system to hydrostatic test pressure.Verify that stress due to pressure at bottom of vertical runs does not exceed 90 percent of specified minimum yield strength or 1.7 times "SE"value in Appendix A in ASME B31.9,"Building Services Piping." 4.After hydrostatic test pressure has been applied for at least 10 minutes,examine piping, joints,and connections for leakage.Eliminate leaks by tightening,repairing,or replacing components,and repeat hydrostatic test until there are no leaks. 5.No pressure drop shall occur during test period. 6.Prepare written report of testing. G.Provide pumps,appropriately scaled gauges,calibrated instruments and test equipment, temporary piping,and personnel for tests.Remove all test equipment and drain pipes after completion of testing. H.If piping system is drained after testing and left empty or untreated for more than 3 days,add Nalco 2572 or equivalent at recommended dosages for dry system lay-up. 3.03 FLUSHING AND CLEANING OF PIPING SYSTEMS A.Notify Engineer and Owner/CxA at least four (4)days in advance.Do not flush any piping system or portion thereof without prior submission and approval of flushing and cleaning plan. B.General: 1.All hydronic piping systems shall be tested and flushed.All temporary equipment,utilities, and materials,including water,required to perform the tests and flushing shall be the responsibility of the contractor.Tests and flushes shall be witnessed by the Engineer or Owner's representative.The contractor shall perform pre-testing so that the Engineer may witness the final test and flush only.If more than one test and flush are required,contractor shall schedule these with the Engineer's site observation schedule.Submit contractor's testing and flushing plan,indicating how the system will be divided for flushing,chemical injection points,temporary bypass piping,temporary drains,etc. 2.Test fluid shall be clean water 3.Flush fluid shall be clean water with listed cleaning chemicals 4.Fill fluid shall be clean water C.Flushing and Fill: 1.Flush entire piping system until clean.Flush velocity shall be minimum of 5 fps through all sections of the system. 2.Contractor shall provide portable pumping apparatus.Provide temporary materials,valves, equipment,and infrastructure,required to create bypass(es)for a closed system to perform flush(es).Bypass permanent building pumps during flush.Remove any devices that could be clogged or damaged prior to flushing.Provide a grade 18-8 stainless steel screen with 3/16 inch diameter holes at 18 holes per square inch in system strainers.Install #100 mesh startup liner in system strainer with metal screen.Operate valves as necessary to ensure all sections of the system are flushed for the required time period. 3.Provide temporary piping to bypass coils,control valves,and other factory cleaned equipment,as wells as equipment subject to damage. 4.Dissolve the following chemicals in the system (listed in pounds per 1,000 gallons of system water): a.EDTA 40 lbs b.CITRIC ACID 35 LBS c.SURFACTANT 4 ounces product:Tritan DF-16 or equivalent low-foaming surfactant 5.After initial 12 hours of flushing,screens and strainers shall be pulled,checked,and cleaned. Flushing shall then continue for another 12 hours.At the end of 24 hours,if strainers are still showing debris,continue flushing for 6 additional hours.System shall be flushed for a minimum of 24 hours and up to 30 hours as required. 6.After completion of cleaning solution flushing,the system shall be completely drained to sanitary sewer.Flush with clean water.If the system cannot be drained completely,put a bleed on system and add clean water until system test at a pH of 6.8 to 7.4. 7.Remove all temporary materials and bypass piping. Docusign Envelope ID: D4F3B98E-0756-4A0C-A3AD-05AA32D39F1C