2019-193-E AMS - Sasser Companies ES remediation

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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C Orange County Emergency Services Building Construction Documents F. Sleeves shall be provided wherever pipes pass through walls, floors and ceilings. Sleeves shall be Schedule 40, black steel, one-half inch in diameter larger than the pipe or insulation on the pipe. Sleeves through walls and ceilings shall be flush. Sleeves through floors shall extend one inch above finished floor. Sleeves through exterior walls shall be caulked and made watertight. G. Pipe Hangers and Supports: 1. Install in accordance with ASME B31.5. 2. Support horizontal piping as indicated. 3. Place hangers within 12 inches of each horizontal elbow. 4. Provide copper plated hangers and supports for copper piping. H. Arrange piping to return oil to compressor. Provide traps and loops in piping, and provide double risers as required. Slope horizontal piping 0.40 percent in direction of flow. I. Provide clearance for installation of insulation and access to valves and fittings. J. Flood piping system with nitrogen when brazing. K. Follow ASHRAE Std 15 procedures for charging and purging of systems and for disposal of refrigerant. L. Fully charge completed system with refrigerant after testing. 3.03 FIELD QUALITY CONTROL A. Test refrigeration system in accordance with ASME B31.5. B. All refrigerant equipment not tested at the factory shall be shut off from the rest of the system and tested under a vacuum with no evidence of leakage. Piping systems shall be tested after installation, and before any insulation is applied. All controls and other apparatus that may be damaged by the test pressure shall be removed before tests are made. C. Refrigerant piping leak testing shall be as follows, unless equipment manufacturer mandates or recommends or more stringent procedure: 1. Connect the refrigerant manifold gauge hoses to the liquid side and gas side service ports on the equipment and connect the center hose to a nitrogen tank fitted with a pressure regulator. 2. Fill the lines with nitrogen to 590 psi but no more than 595 psi. 3. Monitor the pressure periodically for a minimum of 24 hours. If the pressure drops, use soapy water to check for leaks. Bubbles will occur if joints are not tight. 4. Repair leaks. Repeat the previous steps until the pressure remains constant for 24 hours. 5. Maintain 145 psi of pressure for 15 minutes and check for further leakage. If the pressure drops, check for leaks and repair. Repeat this step until 145 psi of pressure is maintained for 15 minutes. 6. Remove hoses from service ports. D. Evacuation Procedure. After performing leak test, use a vacuum pump to triple evacuate the system as described below: 1. Use a vacuum pump with a check valve to prevent pump oil from flowing backward while the vacuum pump is closed. Completely close the liquid-vapor line service valves of the outdoor unit. 2. Using vacuum-rated hoses, connect the manifold gauges to the liquid and suction (and high pressure, if applicable)gas pipes. 3. Evacuate the system to 750 microns, hold for 5 minutes, and check for leaks. Repair and repeat as necessary until vacuum holds. 4. Break the vacuum by applying 10 psi of nitrogen. 5. Evacuate the system to 500 microns, hold for 5 minutes, and check for leaks. Repair and repeat as necessary until vacuum holds. 6. Break the vacuum by applying 10 psi of nitrogen. 7. Evacuate the system to 200 microns. Wait for 15 minutes. A rise of no more than 200 microns is acceptable. If over 400 microns, check for leaks, repair, and repeat. 8. If under 400 microns, continue holding vacuum for 2.5 hours. If vacuum exceeds 400 microns at end of period, check for leaks, repair, and repeat. 9. If system holds under 400 microns for 2.5 hours, system is ready for charging. PDC Project 18102 REFRIGERANT PIPING 23 23 00-4 12/17/2018