CA-NV AWWA 2013 Fall Conference. Chemical Metering Pump, Accessories and Systems. By Richard Hopkins Hopkins Technical Products, Inc

Transcription

1 CA-NV AWWA 2013 Fall Conference Chemical Metering Pump, Accessories and Systems. By Richard Hopkins Hopkins Technical Products, Inc

2 Mathematics Equation #: 1 for Chlorine Flow(MGD) x Dosage(mg/l) x 3.785/gal x 1,000,000 Liquid (mg/ml) x (24 hr/day) x 60 minutes/hours 2 x 2 x x 1,000, x 24 x PPD 10/2/2013 2

3 Mathematic Equation #: 2 GPM x Dosage x 1440 / Concentration x 2 x 1440 / /2/2013 3

4 Mathematics Equation #: 3 Feed Rate (lbs/day) = Chlorine Demand (MGDl) X Dosage (mg/l) X 8.34 lb/gal. 2 MGD X 2 mg/l X PPD 10/2/2013 4

5 Mathematic Equation #: 4 GPM X X Dosage x x /2/2013 5

6 Mathematic Equation Any Chemical for 1 PPM Millions Gallons Per Day Concentration Gallons x 2 = Gallons Per Day 10/2/2013 6

7 Mathematic Equations Flow(MGD) x Dosage(mg/l) x 3.785/gal x 1,000,000 Liquid (mg/ml) x (24 hr/day) x 60 minutes/hours GPM x Dosage x 1440 / Concentration Feed Rate (lbs/day) = Chlorine Demand (MGDl X Dosage (mg/l) X 8.34 lb/gal. GPM X X Dosage Millions Gallons Per Day Concentration 10/2/2013 7

8 Mathematics What did the equations have in common? 33.3 Pounds Per Day 10/2/2013 8

9 Pump Sizing GPM x x PPM Pounds Per Day Chlorine Well Flow Rate GPM Dosage 2.0 Parts per Million How much Chlorine do we need? GPM x x 2 = Pounds per Day / 24 hours Or GPH. 10/2/2013 9

10 Pump Selection 10/2/

11 Setting Pump Stroke and Speed Try to keep stroke length at largest setting. Adjust the pump speed for flow rate. Using the previous example we needed 1.39 GPH. Pump capacity selected was 1.66 GPH. Feed Rate / Pump Capacity = Pump Percentage 1.39 GPH / 1.66 GPH = 84% Metering Pump has 180 SPM so we set the pump speed at (180 SPM x 84%) = 151 spm. Or adjust the stroke length to 84% 10/2/

12 Chemical Metering Systems What is the minimum equipment requirements needed for a chemical metering system? Pump. Tank. 10/2/

13 Pump Installation 10/2/

14 Pump Installation 10/2/

15 Pump Installation 10/2/

16 Pump Installation 10/2/

17 Pump Installation 10/2/

18 Seismic Restrained Pump Installation 10/2/

19 Pump Installation 10/2/

20 Tank and a Pump Does this work? Is this the best installation? What are the potential problems? Inconsistent Feeding. Over Pressuring System. General Maintenance. 10/2/

21 Pump Accessories Back Pressure Valve. Pressure Relief Valve. Multi-function Valve. Calibration Column. Pulsation Dampener. Inlet Stabilizers. Y-Strainers/Basket Strainers. Pressure Gauge. Pressure Switch. Flow Meter / Sensor 10/2/

22 Back Pressure Valves Positive Discharge Pressure. Prevents Anti-Siphoning. Eliminates Varying Dosage Rates. Install Close to Injection Point to Prevent Chemical Line Siphoning Prevents Back Flow. 10/2/

23 Back Pressure Valve 10/2/

24 Pressure Relief Valve Designed to Protect Chemical Feed System from over pressuring caused by defective equipment and blockage. Relief port back to chemical tank or pump suction side. Off-Gassing Chemical will require a PRV between valves. 10/2/

25 Pressure Relief Valve 10/2/

26 Multi-Function Valve Mounts directly on liquid end of pump. Back Pressure. Pressure Relief. Anti-siphon. Priming. Draining the discharge line. 10/2/

27 Calibration Column Installed to enhance performance of your chemical feed system by providing verifying flow rates of the chemical feed pump. 10/2/

28 Calibration Column 10/2/

29 Pulsation Dampener Why use a Pulsation Dampener? Positive Displacement pumps create pulsation and hydraulic shock due to the reciprocating nature of their stroking action, potentially damaging the entire pumping system. 10/2/

30 Pulsation Dampener Reduces pump pulsation and pipe vibration up to 99%. Protects Pipes, Valves, Fittings, Meters and In-Line Instrumentation from destructive pulsations, vibrations, surges, cavitation, thermal expansion and water hammer. Produce an even and smooth flow (Pressure Gauges and flow meters). Extend pump component life and improve pump performance. Insures accuracy, longevity and repeatability of In- Line Meters. 10/2/

31 Pulsation Dampener Manufacturer s Installation Requirements: Install Dampener in-line as close as possible to the pump discharge. Installation should be no more than 10 pipe diameters from the pump discharge. Isolation Valve should be installed between the dampener and pump. 10/2/

32 Pulsation Dampener 10/2/

33 Pulsation Dampener Peristaltic Pump 10/2/

34 Pulsation Dampener 10/2/

35 Inlet Stabilizer Why use an Inlet Stabilizer? Positive Displacement pumps contain an inlet valve that alternately opens and closes, creating an acceleration and deceleration of fluid into the pump. Under High Pressure Liquid flow is abruptly stopped as the inlet valve closes. Rapid deceleration creates a pressure spike or Water Hammer. 10/2/

36 Inlet Stabilizer Under Low Pressure Process fluid separate at the pump s inlet as the inlet valve closes. May not be enough to meet required pump s inlet pressure and may result in product starvation or cavitation. 10/2/

37 Inlet Stabilizer Use an Inlet Stabilizer to: Ensure complete chamber fill extending component service life. Protects pumps, valves and diaphragms from excess stress and strain. Prevents unbalanced hydraulics from friction, acceleration and head (Starvation). Prevents premature system component failure. Extends diaphragm life in all diaphragm pumps. 10/2/

38 Inlet Stabilizer Manufacturer s Installation Requirements: Install as close to pump inlet as possible. Upstream of any valves, elbows and filters. No more than 10 pipe diameters from pump inlet. 10/2/

39 Inlet Stabilizer 10/2/

40 Wye / Basket Strainer Removes sedimentation from fluid that may plug the pump check valves. 10/2/

41 Pressure Gauge / Switch Best troubleshooting device in the system. Displays system pressure. Pressure Switch will shut system off if exceeds set point for protection. Pressure Switch set-point? 10/2/

42 Piping Check chemical compatibility. Where to Check? Piping / Material Sch. 80 PVC, CPVC, Polypro, PVDF, 316SS, Alloy 20, Etc. Check elastomer compatibility. Viton, EPDM, PTFE. Valves Ball Valves (Vented or Non-vented), diaphragm Valves End Connections Threaded, socket, flanged. 10/2/

43 What is wrong You decide 10/2/

44 Engineers Drawing 10/2/

45 Contractor s Installation 10/2/

46 What s Wrong 10/2/

47 Inlet Stabilizer 10/2/

48 Pump Installation 10/2/

49 FET UP! 10/2/

50 Pump Installation 10/2/

51 Pump Installation 10/2/

52 What is the Red Hose 10/2/

53 10 lbs in a 5lb building 10/2/

54 What s Wrong 10/2/

55 What is wrong 10/2/

56 What is wrong 10/2/

57 What s wrong 10/2/

58 Questions Any Questions 10/2/

59 Thank you Thank you 10/2/