| Customization: | Available |
|---|---|
| Max.Head: | 30-50m |
| Max.Capacity: | >400 L/min |
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What is the relationship between flow low and pressure?
When the flow increases, the discharge pressure of the pump decreases, and when the flow decreases the discharge pressure increases
Can a pump be run at zero flow for an extended period of time?
Do not let a centrifugal pump operate for long periods of time at zero flow. The friction of the impeller will make water will boil, the mechanical seal will "burn", all plastic componenets will melt and water will possibly leak into the motor windings In residential systems, the pressure switch shuts the pump down when the pressure is high which means there is low or no flow.
What is a centrifugal pumps minimum flow rate?
There is no standard which establishes precise limits for minimum flow in pumps. Most centrifugal pumps should not be used at a flow rate less than 50% of the best efficiency point. If the system requires a flow rate of 50% or less then use a recirculation line to increase the flow through the pump keeping the flow low in the system. If a pump operates at at very low flows, it could overheat badly and cause noise, vibration, cavitation and mechanical damage.
Should a install pressure gauges in the system?
Make sure your pump has a pressure gauge on the discharge side close to the outlet of the pump this will help you diagnose pump system problems. It is also useful to have a pressure/ vacuum gauge on the suction side; the difference in pressure is proportional to the total head. The pressure gauge reading will have to be corrected for elevation since the reference plane for total head calculation is the suction flange of the pump.
Can a centrifugal pump run dry?
Make sure that the pump is always full of liquid; most centrifugal pumps cannot run dry. In residential systems, to make sure that the pump stays full of the liquid use a check valve in line or a foot valve at the end of the suction line. Use of check valves to isolate pumps installed in parallel.
What kind of isolation valves should I use?
Gate valves or full flow ball valves should be used as these offer no resistance to flow and can provide a tight shut-off. Butterfly valves are often used but they do provide some resistance and their presence in the flow stream can potentially be a source of hang-ups which would be critical at the suction. Butterfly valves close faster than gate valves but are not as leak proof.
What kind of reducer should I use on the suction side?
Always use an eccentric reducer at the pump suction when a pipe size transition is required. Put the flat on top when the fluid is coming from below or straight and the flat on the bottom when the fluid is coming from the top. This will avoid an air pocket at the pump suction and allow air to be evacuated.
Where do I install the isolation valve to control the pump flow?
If you need to control the flow, use a valve on the discharge side of the pump; never use a valve on the suction side for this purpose.
Why is there air in my system?
Avoid pockets or high point where air can accumulate in the piping. An ideal pipe run is one where the piping gradually slopes to the suction of the pump and up from the pump discharge. This will ensure that any air in the the pump can be evacuated.
What is Water hammer?
Water hammer or hydraulic shock is a pressure surge resulting when water in motion is forced to stop or change direction suddenly. Water hammer commonly happens when a valve is closed suddenly at an end of a pipeline system, and a pressure wave if formed in the pipe. This pressure wave can cause major problems, from noise and vibration to pipe collapse. It is possible to reduce the effects of the water hammer pulses with accumulators and other features. For pumps 500 GPM or larger use valves at the discharge that is controlled to open gradually when starting the pump. This will avoid water hammer during the initial start and damage to the piping system.
What pipe size should I use?
The right pipe size is a compromise between cost and excessive friction loss that will affect the pump performance. As a rule of thumb the discharge pipe size should not be smaller than the pump discharge connection. For the suction side, you can also use the same size pipe as the pump suction connection and increase it by one pipe size for every 50 feet of suction pipe. A typical velocity range used for sizing pipes on the discharge side of the pump is 8-12 ft/s and for the suction side 3-6 ft/s. The actual pipe sizes should be determined by calculating the friction loss of the whole system.
What happens when centrifugal pumps are run in parallel?
When two or more pumps are arranged in parallel their resulting performance curve is obtained by adding their individual capacities at the same head. Centrifugal pumps in parallel are used to deliver larger flows than one pump can handle alone. Parallel operation adds pump capacity while the head stays the same.
| TYPE | Inlet Size | Outlet Size | Max flow(LPM) | Max head(M) | Power(kw) | ||
| PP | PVDF | PPS | |||||
| DJ0.5PPE | DJ0.5KV | DJ0.5PPS | 3/4" | 3/4" | 50 | 5 | 0.065 |
| DJ1PPE | DJ1KV | DJ1PPS | 1'' | 1'' | 90 | 7 | 0.15 |
| DJ2PPE | DJ2KV | DJ2PPS | 1'' | 1'' | 120 | 9 | 0.37 |
| DJ2HPPE | DJ2HKV | DJ2HPPS | 1" | 1" | 160 | 15 | 0.55 |
| DJ3PPE | DJ3KV | DJ3PPS | 1-1/2" | 1-1/2" | 240 | 15 | 0.75 |
| DJ3HPPE | DJ3HKV | DJ3HPPS | 1-1/2" | 1-1/2" | 300 | 17 | 0.75 |
| DJ4PPE | DJ4KV | DJ4PPS | 1-1/2" | 1-1/2" | 350 | 17 | 1.1 |
| DJ5PPE | DJ5KV | DJ5PPS | 2" | 1-1/2" | 400 | 23 | 1.5 |
| DJ6PPE | DJ6KV | DJ6PPS | 2" | 1-1/2" | 500 | 26 | 2.2 |
| DJ7PPE | DJ7KV | DJ7PPS | 2- 1/2" | 2" | 800 | 31 | 3.75 |
| DJ8PPE | DJ8KV | DJ8PPS | 2- 1/2" | 2" | 980 | 35 | 5.5 |
| DJ9PPE | DJ9KV | DJ9PPS | 2- 1/2" | 2" | 1000 | 38 | 7.5 |
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