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Water Boosting

The water authorities are only obliged to provide a pressure of 0.7 bar and 9 litres per minute to the boundary of your property. URL: http://www.ofwat.gov.uk/consumerissues/rightsresponsibilities/standards/gud_pro_gss08.pdf

 

People who experience anything more than this pressure should understand that they are very fortunate. It is necessary therefore to increase the water pressure in certain areas where either the property pipe work is extremely restrictive or the property is significantly elevated and the water main pressure cannot overcome the static head pressure.

 

Unless in extreme circumstances (usually fire systems), you are not allowed to install an inline pressure pump that pulls directly from the main. - Instead you have to install a small break or water storage tank with a suitable air gap and overflow to avoid back washing into the authority main. From this tank you can boost the water to the required pressure and flow rate to the property.

 

Prices from - £000.00

Pump and Pipe Sizing - The Fundamentals

When choosing a pump, it is not only important to choose the correct type of pump, but also the correct size of pump. These are largely dependant on the pipe size, static head and length of run.

Each pump will have its output graphed as a 'pump curve' drawn up by the manufacturer. This graph should be used in conjunction with a system curve which will show an expected duty point on the graph.

If the pump is incorrectly sized it will be pumping against closed value or off the end of curve. So whereas often a pump will actually deliver the liquid to the destination, it is not always obvious that it can also be struggling to do it! This also means that the pump can possibly be running with excessive electrical loading and at incorrect temperatures. This will effect the lifespan of a pump.

 

The next most significant cause of pump failure is the selection of an inappropriate pump type. There are commonly two types of pump functions; a pump to deliver a high pressure and a pump to deliver high flow rates.

Fore instance, if your house had poor water pressure, you would need a high pressure output without necessarily wanting an increase in flow. Whereas if you were trying to empty a water tank over a short distance, you would need very little pressure but a high volume output without having an excessive wait to complete the job.

 

Higher pressure pumps (ie approx 2 bar upwards) generally have little dirty water handling capabilities. The tolerances in these types of pumps are so high that the composition of the fluids and particles can either be very abrasive or more commonly blind the tight passages in the pump and ultimately can block it. In addition to the pump running hotter whilst it is working harder to overcome the large resistance's, it also relies on the constant flow and surrounding water (or air if free standing) to cool it. Therefore one problem can quickly provoke other problems and contribute towards the demise of a pump. Apart from additionally installed pump protection systems (excluding electrical and thermal overloads), few installations are properly protected against blockages and dry running.

Prices from - £000.00

Dirty Water

Some (macerator/chopper) type pumps are designed to try and break down the solids in the waters to decrease the sizes to fit the free passage size of the pump. These types of pumps are needed where existing pipes can be too small or far, and therefore have a high friction loss requiring a lot more pressure to push the dirty water to their destinations.

These types of pumps are normally quite expensive and require more maintenance. When the cutters become blunt, the pump is prone to blocking and can become troublesome. However, these types of pumps can be a good choice when carefully selected for the application. If designing a new installation it is prudent to choose a larger bore pipe with a high free passage pump. Maintenance and blockages and running costs are normally significantly better.

 

High flow pumps are often equipped with a high free passage and are better at handling dirty water. It is important to exceed the minimum velocity of the fluid in the pipe (typically 1 metre per second) to prevent solids from settling out in the bottom of the pipes. Eventually this can cause blockages in the system. Likewise an excessively large bore delivery pipe will although have a minimal friction loss (which is ideal), may not always have enough velocity to prevent settlement.

 

A delivery pipe type and size must be perfectly matched with a correct pump type and size.

Prices from - £000.00

Ground Works

 

Any grounds works needed.

Prices from - £000.00

Boreholes and private water

The world of private water supplies and waste water/slurry systems can prove to be quite a worry when they are not properly understood. With over 500 private water supplies in West Dorset alone, it is one of the most concentrated areas in the UK. However, not all these supplies are without their own problems. Frequent questions like:

Why has my private water supply test now failed after 20 years of good water?  

And how can I be in breech of water regulations by simply plumbing mains water back into my system?

all have their individual answers.

The answers to these questions can be long and varying depending on each situation. But normally the principals are still the same. For instance, it is necessary to install an air gap between a mains supply and any system that can potentially backwash back into the mains supply. (Much the same as cattle troughs). Only this is usually achieved with a break tank with an overflow on the side that will allow water to overflow faster than it can fill in event of a valve failure. Water held in the tank can then be distributed to the farm via another pumped system. Water storage can be useful in event of a low yielding borehole as it can not only act as a buffer, but allow you time to repair the faulty borehole system. Some boreholes are plumbed directly into the farms’ distribution pipework where mains backup is not present or indeed not even an option.

 

Private water supplies can sometimes fail water testing due to external factors where contaminants have entered a watercourse, for example spraying or muck spreading in nearby fields. Likewise heavy rainfalls can wash other contaminants from surface water into shallow wells and holding tanks.

 

Other locations, particularly in North Dorset can suffer from ‘Greensand’ or high minerals such as ‘Iron’ or ‘manganese’. On the whole though, the minerals can be removed economically but still involve a high capital outlay involving thousands of pounds. Greensand for instance is often an uneconomic process to get removed from a water supply and proposed new borehole areas potentially prone to ‘Greensand’ are avoided where possible.

 

New boreholes are drilled all the time and with the extraction licence not normally starting until one uses over twenty cubic metres per day, it can often prove a good investment, wherever possible, to sink a hole. Typically new boreholes (where successful) can pay for themselves very quickly. Be warned though to make sure to have a hydro geological report completed before any drilling is attempted.

 

Prices from - £000.00

3 Core Pumping Systems Limited REGISTERED IN England and Wales COMPANY NUMBER 07499344