What size Industrial Water Pump do i need and how to determine pump size

by Eve W. SEO's little space

Many people every year lose lots of money because they decide to buy a diesel Industrial Water Pump before they designed their irrigation or transferring water system, and then discovered it wasn't the right type or size. Let's make it right and design pump first and then make a purchase.

 

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There are a few terms involved in to basic pump specification like: flow rate, head pressure, shut off head and a few other terms related to the engine type. Along with "flow rate," a pump's "head pressure" (or more accurately "pressure-head," "shut-off head," or "shut-off pressure") is a term often used in pump literature to describe how powerful a pump is. "Flow rate" is simply the volume of water a pump can move during a given amount of time. Pump flow rates are usually expressed in liters per hour or liters per minute.

 

"Head pressure" on the other hand is more complicated. "Head" may be simply defined as any resistance to the flow of a pump. When pump manufacturers list the head pressure, they are referring to the vertical discharge pressure head. Described in very simple terms, a pump's vertical discharge "pressure-head" is the vertical lift in height (usually measured in feet of water) at which a pump can no longer exert enough pressure to move water. At this point, the pump may be said to have reached its "shut-off" head pressure which means flow rate at that point is zero. So far we have established principle about how far water is going to be transfer and how high it goes.

 

Next important question to ask is: 'what type of pump do we need'?

Pumps commonly used for irrigation or water transfer fall into many categories based on the design of the pump, type of use and integrity. For this particular subject we will narrow our search to the Centrifugal Pump, which are the most popular pump used with Diesel or petrol engines

 

A centrifugal pump uses an "impeller" to spin the water rapidly in a "casing", "chamber", or "housing" (any of those terms may be used). This spinning action moves the water through the pump by means of centrifugal force. Centrifugal pumps may be "multistage", which means they have more than one impeller and casing, and the water is passed from one impeller to another with an increase in pressure occurring each time. Each impeller/casing combination is referred to as a "stage".

 

 

All centrifugal pumps must have a "wet inlet", that is, there must be water in both the intake (inlet) pipe and the casing when the pump is started. Pump can't suck water up into the intake pipe. They must be "primed" by adding water to the intake pipe and case before the first use. To prime them you simply fill the intake pipe with water and then quickly turn on the pump. To put it simply, this type of pump can't suck air, only water, so if there is no water already in the pump it won't pull any water up into it. Once it gets water in it the first time, most centrifugal pumps are designed to hold the water with a small valve so the pump doesn't need to be primed again every time you turn it on. It's also very important to seal suction line (make it air tight) to allowing correct priming.

 

Lastly but, not less important is to choose this right pump with the right engine.

There are two most common engines used for the centrifugal pumps petrol fueled and diesel. Petrol engines are recommended for short jobs where pump is often move from one place to another and do not run for long hours. Diesel Engines are ideal where pumps are going to work for long hours.

Unlike petrol engines, diesels have no spark plugs to replace, or carburetors to rebuild and service. Diesel generally burns less than half the fuel that petrol engines do to do the same amount of work. Diesels regularly outlast petrol engines ten-to-one. For example, the average single cylinder petrol engine powering a Industrial Water Pump will run for around 1000 hours before needing replacement or a complete overhaul. And that's an average. Many don't make it past a few hundred hours. The average diesel engine will run 10,000 hours before needing any service beyond routine maintenance, but many make it to 30,000 hours, and some a lot longer than that

 

There are many other factors influencing selection of Industrial Water Pump. Most of them will vary between site conditions, frequency of use and purpose. All of them need to be carefully considered before making right choice.

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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