How to select a water pump?

HOW TO CHOOSE A PUMP?

Notes: This Guide only serves for general users. Regularly, the advices from your Design Office or Pump Installing Departments should be taken into your first consideration.

Before purchasing a pump, please think over the following points in advance, which will do be enable you to know more about water pump and choose the most suitable one for you.

How many capacity and head do you need?

According to practical Capacity and Head requested, pick up the type of pump from the Performance Chart in this catalog, and it would be better to put the pumps’ optimal operating point among the running range of pumps. Optimal operating point of a pump is usually its rated point.

However, maybe there are some kinds of pumps satisfying both in the capacity and head on your need, in that case, please refer following points before come to a final decision.

What kind of pump would you choose?

We have three kinds of pumps for you to select, peripheral pump, centrifugal pump and Jet pump.

Suppose all kind of pumps when in a same power:

Peripheral pump would provide a higher Head but lower Capacity than centrifugal pump and JET pump. It can get higher Head in an economic way.

Centrifugal pumps provide larger Capacity. It has higher efficiency than that of peripheral and Jet pump. and it is a good choice for those pumps large expending in electrical power to save energy.

And JET pump provide more reliable output.

Please check feature of each pump in this catalog for detail.

In what particular field your pump is used for?

Pumps for different use, they cost different materials and the price is quite different, thought the performance and appearance of them are the same.

We divided our pumps to three kinds use: domestic, civilian and industrial.

Domestic pump is usually installed inside the house or in the courtyard with a shelter for domestic daily use; Usually it convey clean liquids and non-aggressive chemical fluids.

And the pumps for civil use are installed in storied building, worksite, store, workshop, country or farm for distributing water, irrigation, cooling, fireproofing, etc.

Industrial pump is mainly used in significant occasion such as equipped in an industries machine, buildings tall blocks, transferring chemical fluids, food liquid, etc.

Usually, a(the) pumps design only for domestic use, it would not be used for civilian and industrial use; otherwise, it will be worn out quickly or even be damaged some time. In the other hand, it is unnecessary to use a civilian or industrial pump for a domestic occasion.

What is the kind of fluid transmitted?

Pacific design different pumps for different fluid: clean water, dirty water, water with fine sand, hot water, diesel oil or hot oil. Make sure that your pump would be suitable for the transmitted fluid. Avoid using the clean water pump to deliver sewage because it will cause of blocked impeller and burning down the electric motor. Do not use a dirty water pump to deliver clean water to prevent the decline of its efficiency and waste energy. Ordinarily, the ambient temperature should not over 40℃ and the fluid temperature should not  exceed over Max temperature showing in this catalog.

If you need pumps for higher temperature fluid, Please advise us. We will find a solution for you.

What's the Suction Lift and NPSH (Net Positive Suction Head)?

Owning to the atmospheric pressure, for a certain fluid, there is a certain suction head. For example, for water, the maximum suction lift of an ordinary domestic pump is about 8m. Even when the suction pipe would be pumped to vacuum, it would be about 10M high suction head only. However, choose a deep well pump instead when a deeper suction-15m for example, is required. Because Deep Well pump consisted of two parts in fact, JET pump and Centrifugal pump. Its deeper head come from the combination of Jet pump’s head and centrifugal pump’s suction head. Take care to the NPSH when use industrial pump or civilian pump, to ensure the pump's stable and continual operation. But for pumps domestic using, usually we do not take NPSH into consideration.

Finally, please consider pump’s efficiency, appearance and the price before come to your final decision.

Advice:

. The pump drived by electromotor is more preferential to consider.

. it is preferential for pumps to be coaxal with the power source.

. Usually some pumps cannot be operated for its entire head. Avoid operating the Centrifugal pump under the condition of low head out of their range, or it will make the pump over-loaded---the lower the head is, the bigger power is required. To the contrary, never operate the peripheral pump under the condition of high head out of their range; for it will make the pump over loaded---the higher the head is, the bigger power is required. So take care for the pump running within operating range. For Jet pump, its power changes little when change its head or capacity. So it can be used for the whole Head.