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Sequence Pump Installation & Pond Plumbing Hints
From The Water Garden & the Makers of Sequence Pumps

Acrobat PDF version of this file for printing

We hope you will find the following suggestions and comments regarding pump installation to be helpful. We do not claim that any of these suggestions are the only way to accomplish your job, but in general they will solve many of the commonly found problems and help you prevent many others.

Please note that Sequence pumps are out-of-pond pumps.  Do not submerge!

  1. Locate the pump as close to the source as possible. It is best to have your main (longest) run of pipe on the discharge side of the pump. The pump is designed to push water, not pull it.
  2. Install the pump outside the pond, and if possible below the level of the surface of the pond (flooded suction). This will help insure a proper supply of water to the pump. Remember, a pump can’t pump out water if there isn’t any available. Even if your supply line comes up and over the top of the pond wall, it will still offer a flooded suction if it has no breaks to atmosphere before it goes back down below the surface level, and if all air is removed.

When pulling water from a skimmer install a check valve to keep the pump primed and unions for easy disconnect of the pump and plumbing. A gate valve should be installed on the suction side of the pump.

skimmer plumbing cut-a-way

 

3. If it is not possible to provide a flooded suction installation then:
  1. Position the pump as low as possible, and as near the source as possible. (A pump one foot above the surface works better than one six feet above the surface.)
  2. Install basket strainer on the inlet of the pump or provide some other priming source.
  3. Suction piping should slope gently upward to the pump or strainer inlet.
  4. Install a foot valve, or a check valve in the inlet line below the water level.
  5. Always prime the entire inlet line, basket strainer, and pump before turning it on.
  6. If your pipe has a high spot (as in lower right illustration), install a tee at the highest spot and use this spot to prime the suction line, (or to bleed off air if pump is higher than the tee)

  1. Always have your inlet pipe diameter equal to, or larger than, the discharge line. This helps prevent cavitation.
  2. Minimize friction losses by using large diameter pipe. Determine the approximate flow rate you want, and the total length of your pipe. Consult The Water Garden's friction loss chart and calculator to choose the proper diameter pipe. (The size of the pumps suction and discharge ports does not indicate your proper pipe size.) Choose a pipe diameter that keeps your friction loss below about five feet per hundred feet of pipe. Even if you have a section of small diameter pipe that you can’t change, as with a through the wall fitting, it is still beneficial to use larger pipe on the majority of the run. The following chart can help you determine your correct pipe diameter.
Discharge Diameter   Max. Recommended Flow
  US gph
3/4" tubing 300 - 600
1" tubing 600 - 900
1 1/4" tubing 900 - 2,200
1 1/2" flexible PVC pipe 2,200 - 3,500
2" flexible PVC pipe 3,500 - 5,000
  1. Use a filtration system that does not require a lot of pressure. It costs money to create pressure. Biological filters work well and require very little pressure.
  2. Never allow a out-of-pond centrifugal pump and motor unit to become submerged. Use a GFI circuit for protection.  If this ever accidentally occurs, shut the unit down, disconnect it, and have a reputable service shop examine the motor before re-using it.
  3. Never run a pump dry. This may damage the mechanical seal and impeller. They are designed to pump fluid, not air. Insure the pump is full of water before you turn it on, and that it doesn’t out pump the supply. Note: if you have purchased a dry run seal, it can run without water for a limited period of time.
  4. Cover the pump and motor unit with a suitable shelter. When protected from rain and dust the motor will last longer. The covering should allow the motor to have suitable air recirculation for proper cooling.
  5. If your pump is producing too much flow, you can reduce the flow by partially closing a valve on the discharge line. Never restrict the inlet!!! Always allow a couple gallons per minute to flow to prevent heat build up inside the pump housing.
  6. If more flow is required than a single pump can produce, consider using two or more pumps in parallel. This also offers the benefits of being able to vary the flow rates, insure partial flow if one units needs servicing, and can often save a substantial amount of electricity compared to using a single, larger pump.
  7. Choose a pump that can give you the required flows at the lowest possible power consumption. Since pumps often operate continuously, the power consumption (watts - not amps), and its effect on your monthly utility bill can be very significant.
  8. Check to be sure the motor electrical connections are set up to match the supply voltage.
  9. Install shut off valves before and after the pump, so you can easily remove it from the line without having to drain your system.  Be sure to use ball valves, as they have low friction loss characteristics.
  10. Use Teflon paste (not tape) for sealing threaded joints.
  11. Make sure all your pipe joints are airtight. This is especially important on the suction side.

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Above information: Copyright © 2001 MDM Incorporated (Manufacturer of Sequence Pumps)

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5212 Austin Road, Chattanooga TN 37343
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Phone: 423.870.2838   Fax: 423.870.3382

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