Specifications include, but are not limited to: In general, project includes replacing a total of seven (7) diaphragm chemical pumps for chemical addition to the secondary effluent work includes. There are four (4) that are pumping sodium hypochlorite and three (3) that are pumping bisulfite. Pump Fabrication 1. Pump a. Fixed suction and discharge stroke length. b. Drain connection in pump discharge head. c. Suction single ball check valve. d. Discharge single ball check valve. e. Ball-check inlet and outlet valves. f. Moving parts totally enclosed and self-lubricating. • g. Complete external control with turndown capability as shown above. h. Capable of operating dry without damage to any components. i. Repeatable accuracy: 1 percent of maximum output or better. j. Nameplate showing chemical, capacity in gallons per hour and pressure ratings. k. Capable of venting gas/air build-up for Sodium Hypochlorite Pumps for up to 30 seconds without an alarm. If the pump does not begin pumping, "no flow" alarm signal will be activated. l. Pump output shall be essentially "pulseless" throughout pumping range of pump without need for pulsation dampeners. m. Pump shall be UL listed for chemical use 2. Drive a. Motors: 115 VAC. b. Manually and automatically adjustable speed internal stepper motor drive. c. Power connection: 3-prong 115 V AC plug 1. Integral with pump. 2. Output control: a. Manual through push buttons on pump control panel b. Automatically by 4-20mA external signal or from the plant's DCS via Profibus communications. 3. Digital readout control panel with flow display in gallons per hour. 4. Remote ON/OFF control from plant's DCS via Profibus Communications. 5. Remote FAIL alarm from plant's DCS via Profibus Communications. 6. Communication between pump and plant's DCS via Profibus Communications. a. No flow condition alarm. b. Pump flow in GPH. c. Running status. d. All other data and programming available at the pump controls shall be available from plant's DCS via Profibus Communications. 7. Plant DCS System shall activate a 120 VAC output to energize gas venting valve upon detection of no flow. Once flow is detected, gas venting valve will be de-energized. If the failure does not clear in 20 seconds, pump fail alarm will be activated. 8. Profibus Communication Module 9. Four pin receptacle on pump panel for connection of Profibus special cable.
