Chemical Metering Pump, Accessories

and Systems.

By

Richard Hopkins

Hopkins Technical Products, Inc

CA-NV AWWA

2013 Fall Conference

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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 3.785 x 1,000,000

315.16 x 24 x 60

33.36 PPD

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Mathematic

Equation #: 2

GPM x Dosage x 1440 / Concentration

1388.88 x 2 x 1440 / 120000

33.33

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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 8.34

33.36 PPD

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Mathematic

Equation #: 4

GPM X 0.012 X Dosage

1388.88 x 0.012 x 2

33.33

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Mathematic

Equation Any Chemical for 1 PPM

Millions Gallons Per Day

Concentration

2

0.120

16.66 Gallons x 2 = 33.33 Gallons Per Day

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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 0.012 X Dosage

Millions Gallons Per Day

Concentration

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Mathematics

What did the equations have in common?

33.3 Pounds Per Day

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Pump Sizing

GPM x 0.012 x PPM – Pounds Per Day Chlorine

Well Flow Rate – 1388.89 GPM

Dosage – 2.0 Parts per Million

How much Chlorine do we need?

1388.89 GPM x 0.012 x 2 =

33.33 Pounds per Day.

33.33 / 24 hours

Or 1.38889 GPH.

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Pump Selection

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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%

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Chemical Metering Systems

What is the minimum equipment requirements

needed for a chemical metering system?

Pump.

Tank.

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Pump Installation

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Pump Installation

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Pump Installation

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Pump Installation

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Pump Installation

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Seismic Restrained Pump Installation

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Pump Installation

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Tank and a Pump

Does this work?

Is this the best installation?

What are the potential problems?

Inconsistent Feeding.

Over Pressuring System.

General Maintenance.

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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

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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.

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Back Pressure Valve

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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.

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Pressure Relief Valve

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Multi-Function Valve

Mounts directly on liquid end of pump.

Back Pressure.

Pressure Relief.

Anti-siphon.

Priming.

Draining the discharge line.

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Calibration Column

Installed to enhance performance of your chemical

feed system by providing verifying flow rates of the

chemical feed pump.

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Calibration Column

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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.

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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.

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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.

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Pulsation Dampener

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Pulsation Dampener – Peristaltic Pump

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Pulsation Dampener

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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”.

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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”.

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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.

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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.

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Inlet Stabilizer

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Wye / Basket Strainer

Removes sedimentation from fluid that may plug the

pump check valves.

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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?

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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.

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What is wrong

You decide

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Engineers Drawing

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Contractor’s Installation

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What’s Wrong

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Inlet Stabilizer

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Pump Installation

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FET UP!

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Pump Installation

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Pump Installation

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What is the Red Hose

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10 lbs in a 5lb building

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What’s Wrong

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What is wrong

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What is wrong

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What’s wrong

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Questions

Any Questions

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Thank you

Thank you