FAQ’s

Pumps

Diaphragm Pumps - Variable Speed vs. Fixed Speed

Variable Speed Models (continuous pulse free output)

Continuous pumping, even while adjusting the percentage of output. See image below.

Graphical representation of the variable speed diaphragm pump injection characteristics.
Note: Your chemical or solution is mixed in the fluid. This image is only illustrating the feed characteristics.

Fixed Speed Models (intermittent cycle time output)

You control the pumps feed by using timers (built-in or external). See image below.Usually fixed speed outputs can be adjusted by:

  • Selecting the pump head diaphragm size.
  • Manual stroke length adjustment (cam style).
  • Choosing the desired RPM (revolutions per minute).

Graphical representation of the fixed speed diaphragm pump injection characteristics.

Note: Your chemical or solution is mixed in the fluid. This image is only illustrating the feed characteristics.

Diaphragm Pump Fixed

Peristaltic Pumps - Variable Speed vs. Fixed Speed

How to Choose Variable speed or fixed speed peristaltic pumps.

Variable Speed Models (continuous pulse free output)

Continuous pumping, even while adjusting the percentage of output. See image below.

Graphical representation of the variable speed peristaltic pump injection characteristics.
Note: Your chemical or solution is mixed in the fluid. This image is only illustrating the feed characteristics.
feedVariableSpeedPer610

Fixed Speed Models (intermittent cycle time output)

You control the pumps feed by using timers (built-in or external). See image below.

Usually fixed speed outputs can be adjusted by:

  • Selecting the pump head tube size.
  • Choosing the desired RPM (revolutions per minute).

Graphical representation of the fixed speed peristaltic pump injection characteristics.
Note: Your chemical or solution is mixed in the fluid. This image is only illustrating the feed characteristics.
peristalticPumpFixed610

How to: Calibrate Pumps (determine feed rate)

  1. With the pump installed under normal operating conditions, place the suction tubing in a graduated container.
  2. Fill the container with the same chemical normally injected, and run the pump until all air is removed. (Prime the pump).
  3. Refill the container if necessary, and with the foot valve in the solution, note the amount of chemical in the container.
  4. Using a stopwatch or timer, run the pump for a measured amount of time (example: 1 minute). Note the amount of chemical pumped during that time.

Tip: The longer the testing time, the more accurate the measurement.

Example:

During your 1 minute calibration period, say your injector pumped 2.5 ounces.

2.5 ounces per minute (OZM)

volumetricFormula2


volumetricTest2


Your pump is calibrated to pump 1.17 GPH – or – 28.08 GPD

How to: Pump and Fittings Maintenance

Periodically clean the injection fitting / check valve assembly, especially when injecting fluids that calcify such as sodium hypochlorite. These lime deposits and other build ups can clog the fitting, which will increase the back pressure and interfere with the pump accuracy.

Warning: Severe cases can physically damage the injection fitting and the increase back pressure can cause increased wear on the pump components; gears, bearings and pump tubes.

Please follow these steps when cleaning your injection fitting / check valves.

    1. Wash the pump, tubing and fittings out with clean water. To do this, place the “suction tubing” and “discharge tubing” (injection fitting too) in a container full of clean water.
    2. Let the pump run in the clean water for a couple of minutes to remove all traces of chemical.
    3. Remove the lime deposits with undiluted vinegar. To do this, place the “suction tubing” and “discharge tubing” in a container full of undiluted vinegar. See below image.
    4. Let the pump run in the undiluted vinegar for 5 to 10 minutes (longer if needed).
    5. Flush out your pump, tubing and fittings to remove any excess vinegar. To do this, repeat steps 1 and 2.

valveCleaning

limeDep_injection

Tip: If you have a diaphragm pump head that needs cleaning, follow the same steps above. Refer to the exploded view in your instruction manual when assembling the pump head.

Tip: Follow the same steps above to clean a foot valve.

Tip: Standard Injection Fittings are made of Polypropylene. PVDF Injection Fittings are recommended for use with aggressive chemicals which are not compatible with Polypropylene. PVDF Injection Fittings should be considered for use with chlorine at elevated temperatures.

Tip: Blue-White recommends that you purchase a spare Injection Fitting for your pump. This is commonly the most neglected part of most pump installations. You can purchase a spare Injection Fitting for around $30 (US).

How to: Injection Fitting (check valve) Installation

Injection fitting prevents backflow from a treated Line*


  • 1/4″ and 1/2″ Male NPT for pipe installation.
  • Available tubing connection sizes:
    • 1/4″ tube
    • 3/8″ tube

The Injection Fittings are provided as standard on all Blue-White diaphragm and peristaltic metering pumps.


InjFitting 1/4
1/4″ tube | 3/8″ tube


Injection Fitting (check Valve) installation.


The Injection Fitting is designed to install directly into either 1/4″ or 1/2″ female pipe threads (NPT).
You can trim the injection point (nose) if needed. See image to the right.

The nose section is designed to inject the chemical away from the wall of your pipe.

We do offer another Injector Fitting for smaller pipe sizes (such as 1/2″ and 1/4″). This fitting does not have the same length at the injection point (nose). See images to the right.


InjFitting_Dim



Install the Injection Fitting directly into a tee fitting.


The solution must inject directly into the flow stream.

Use PTFE® thread sealing tape on the pipe threads of the Injection Fitting.

This illustration shows the Injection Fitting installed in a tee fitting using the 1/2″ threads.


InjFitting_Color



You can install the Injection Fitting directly into your pipe.


Drill the correct size hole and then tap the hole for 1/4″ or 1/2″ NPT.

Use PTFE® thread sealing tape on the pipe threads of the Injection Fitting.

This illustration shows the Injection Fitting installed directly into pipe using the 1/4″ threads.


InjFitting_Pipe



Exploded View (ball check valve)


Injection_Fitting
Cut an appropriate length of discharge tubing (opaque tube). Push one side of the tubing onto the compression barb of the Injection Fitting. Use the tube nut to secure the tube. Hand tighten only.

The exploded view drawing above shows the “tube nut” on the far right hand side. The part to the left side of the “tube nut” is the “compression fitting” that the tube must fit onto.

Cleaning: The Injection Fitting (check valve) will require periodic cleaning, especially when injecting fluids that calcify such as sodium hypochlorite. See our “How To” page on cleaning your Injection Fittings.


Available Injection fittings with 1″ nose.


Model No.Tube connection (OD)Body materialCracking PressureO-ring
A-014N-4A1/4″ tubingPolypropylene1/2 lb.Viton / Aflas
C-395N-4A1/4″ tubingPolypropylene6 lb.Viton / Aflas
A-014N-6A3/8″ tubingPolypropylene1/2 lb.Viton / Aflas
C-395N-6A3/8″ tubingPolypropylene6 lb.Viton / Aflas
A-014NK-4A1/4″ tubingPVDF1/2 lb.Viton / Aflas
C-395NK-4A1/4″ tubingPVDF6 lb.Viton / Aflas
A-014NK-6A3/8″ tubingPVDF1/2 lb.Viton / Aflas
C-395NK-6A3/8″ tubingPVDF6 lb.Viton / Aflas

See an example of a Typical Installation drawing.

* This is not an anti-siphon valve

Flowmeters

How to: Variable Area Flowmeters - Reading Float

Variable Area Flowmeters (Rotameters)

Images to the right are examples of the floats physical characteristics in a Variable Area Flowmeter.

Your Blue-White Flowmeter is clearly marked where you will need to read the float. Use this chart as a reference.


Screen Shot 2013-08-14 at 12.12.34 AM

Read Float at Largest Diameter.

Please note the Floats up position when disassembling the flowmeter for cleaning.


Screen Shot 2013-08-14 at 12.12.20 AM

Read Float at Top.

Please note the Floats up position when disassembling the flowmeter for cleaning.


How_it_works3

Tapered Flow Tube.

The meter comprises a vertically tapered tube through which the fluid to be measured is passed, from the smaller end up to the larger. As the fluid flows through the tube, it forces an indicator (float) upward. The clearance space (area) between the float and tube increases as the float approaches the top of the meter. This increasing area requires a larger amount of fluid to force the float higher. By varying the taper of the tube, the mass of the float, and the length of the tube, different flow ranges can be calibrated.

The variable area flowmeter must be plumbed into a piping system the right way: that is, with the narrow part of the taper at the bottom. Usually printed on, or next to, the tube are the flow increments (scale). The flow rate can be read by matching the increments on the tube with the edge of the float.

How to: DIGI-METER Paddle Replacement

image

  • Please pay attention to which side the notch is facing (Step 1) before you try to push out the shaft (axle) in Step 2. The Shaft hole is smaller on one side than it is on the other.

How to: DIGI-METER Installation

Mounting Location for your Digi-Meter Paddlewheel Flowmeter

Although the Digi-Meter is designed to withstand outdoor conditions, a cool, dry location where the unit can be easily serviced is recommended.

  • The Digi-Meter can be mounted on horizontal or vertical runs of pipe. Mounting at the twelve o’clock position on horizontal pipe is recommended. Mounting anywhere around the diameter of vertical pipe is acceptable, however, the pipe must be completely full of water at all times. Back pressure is essential on downward flows.
  • The Digi-Meter accuracy is affected by disturbances such as pumps, elbows, tees, valves in the flow stream. Install the meter in a straight run of pipe as far as possible from any disturbances. The distance required for accuracy will depend on the type of disturbance. See illustrations and table below.

f1000_pipe_minmax

  • The pipe must be completely full at all times. Air bubbles or air pockets in the flow stream will adversely affect the reading. A small amount of back pressure is recommended in horizontal runs of pipe.

f1000_flow_disturb

Pipe Flow Stream Requirements

  • The Digi-Meter accuracy is based on steady, undisturbed flow with a fully developed turbulent flow profile. Pulsating, swirling and other disruptions in the flow stream will effect the meter’s accuracy.
  • The F-1000 is factory calibrated to ± 2% and the F-2000 is calibrated to ± 1% of full scale linearity. Accuracy is based on laboratory testing of nominal pipe dimensions. Your actual accuracy will vary based on your actual pipe I.D. And other installation factors.
  • There are two basic types of flow profiles; turbulent and laminar. Turbulent flow exists when the speed of the fluid flowing in the pipe is nearly constant across the entire width of the pipe. This is typical of low viscosity fluids; like water, flowing at high velocity. Laminar flow exists when the speed of the fluid flowing in the center of the pipe is greater than the speed of the fluid at the outer edge near the pipe wall. This is typical of high viscosity fluids flowing at low velocity. Because the Digi-Meter is measuring the fluid near the pipe wall only (especially in larger pipe sizes), a constant flow velocity across the flow stream is required.

f1000_turbulent1

To determine which type of flow exists in your installation, the following is required:

Flow rate of the fluid in GPM – Q
Specific gravity of the fluid – G
Pipe inside diameter in inches – D
Fluid viscosity in Centipoise – V

Use the following equation to determine the REYNOLDS NUMBER:

REYNOLDS NUMBER  =  (3160 x Q x G)  /  (D x V)

Flow conditions with a Reynolds Number greater than 4000 is fully developed turbulent flow. A Reynolds Number less than 2000 is laminar flow. The Digi-Meter requires a Reynolds number greater than 4000 to maintain accuracy.

How To: Sonic-Pro Zero Calibration

    Sonic-Pro® Zero Calibration – PC Software

    Sonic-Pro® Zero Calibration – S3 Touchpad