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' 2. Throttling duty: use gate,ball,and butterfly valves <br /> 3. Install shut-off duty valves at each branch connection to supply mains,and elsewhere as indicated. <br /> 4. Install throttling duty valves at supply connection to each piece of equipment,and elsewhere as indicated. <br /> B. Install angle pattern globe valves on the supply side of each wall mounted terminal unit. If unit has an enclosure, <br /> install the valve within the enclosure. <br /> C. Install drain valves at low points in mains,risers,branch lines,and elsewhere as required for system drainage. <br /> D. Install swing check valves as required to control flow direction,and to serve as"vacuum breakers." <br /> 3.07 PRESSURE REDUCING VALVE INSTALLATIONS <br /> A. General: Install pressure reducing valves as required to regulate system pressure. Install in a location readily <br /> accessible for maintenance and inspection. <br /> B. Size reducing valves to supply the maximum steam requirements of the heating system or equipment indicated, at <br /> the indicated inlet and outlet pressures. <br /> C. Provide bypass around each reducing valve,with a globe valve equal in size to the area of the reducing valve seat <br /> ring. <br /> D. Install gate valves and unions around each reducing valve to facilitate removal and repair of reducing valves. <br /> Unions may be omitted for reducing valves with flanged connections. <br /> E. Install pressure gages on the low pressure side of each reducing valve and ahead of the shutoff valve plus one <br /> downstream for the shutoff valve. <br /> 1. On two-stage reducing stations,install a drip trap and pressure gage upstream from the second stage reducing <br /> valve. <br /> F. Install strainers upstream for each reducing valve. <br /> 1. On two-stage reducing stations omit the strainer upstream from the second stage,unless specifically indicated <br /> otherwise. <br /> G. Install safety valves downstream from each reducing valve set a 5 psig higher that the reduced pressure when the <br /> reduced pressure is under 35 psig;and at 10 psig higher than the reduced pressure,if the reduced pressure is above <br /> 35 psig or the first-stage of two-stage reducing. <br /> 3.08 SAFETY VALVE INSTALLATIONS <br /> A. Install relief valves in accordance with and where required by ASME B 31.1 - "Power Piping." Pipe discharge to <br /> atmosphere outside the building,without stop valves. Terminate vent pipe with screened vent cap. Install a drip <br /> pan elbow fitting adjacent to the safety valve. Pipe drip pan elbow drain connection to the nearest floor drain <br /> without valves. Comply with ASN E Boiler and Pressure Vessel Code for installation requirements. <br /> 3.09 TERNMAL EQUIPMENT CONNECTIONS <br /> A. Piping size for supply and return shall be same size as the equipment connections. <br /> B. Install traps and control valves in accessible locations as close as possible to the equipment. <br /> ' 15520-9 No.99132-CP2 <br />