Top Answer
User Avatar
Wiki User
Answered 2012-08-23 06:38:30

I.GRAVITY TANK SYSTEMSL.NoADVANTAGESDISADVANTAGES1Extremely simple - there is no complicated or sophisticated controls.Tank must be elevated. Provisions must be made to support the water filled tank adequately. A tank on the roof is unsightly, and if it is enclosed and dressed up there is additional architectural expense.2Most reliable - It is the only system which has a reserve capacity in the event of a power or water supply failure.The weight of the water filled tank can increase structural costs.3Economical - Operating costs are much less, and capital expenditure is generally no higher than for other systems.Tanks required periodic cleaning and painting.4Minimum maintenance - The only requirement beyond those required for all systems is periodic cleaning and possible repairing of the tank.If a tank ruptures, large quantities are released which could cause extensive damage.5Uses less energy - Pump head and , therefore , horsepower is less than in other systems. The pumps operate only to replinish the tank, and then stop so that a high horse power pump is not required to satisfy low demands as is required in the booster Pump system. The pumps operate at the optimum point on the pump curve for greater efficiency and less energy wastage.Terrace floor is full of piping network and ring mains which is a draw back,then these terraces are not treated as common terrace area.6The pumps in a gravity system always operate at full capacity and peak efficiency, and shut down when there is no demand.Requires bulky overhead tanks7System pressure is less than 2Kg/sqcm and hence failure of CP fittings is remote.Equal pressure can not be achived at all the draw-off points.8Back-up power not necessary.9The fixtures at floor level immediately below over head tank will not have sufficient residual pressure for efficient operation / working of fixtures unless the staging of overhead tank is increased.10Not suitable for sloped roof terracesII.HYDROPNEUMATIC SYSTEMSL.NoADVANTAGESDISADVANTAGES1Less floor space is required as there are no large tanks to take up valuable space, and verticle pumps occupy considerably less area than horizontal pumps.Sophisticated controls - Manufacturer's trained personnel are usually required for adjustments and other routine maintenance2The intial cost can always be off setted with construction of OHT & its impact on structural members. Each system installation must be evaluated seperately.There is no emergency water reserve. Power supply must be 24/7, The building is without water if power failure occurs / with DG backup, the water supply is disrupted or the pumps fail to operate for any reason.3Uniform pressure can be achieved at all fixture outlets irrespective of the locationNoise problems - If other than multi-stage turbine pumps are used, there is a very serious problem. If centrifugal pumps are used, the danger of low-flow turbulence and high flow cavitation requires special attention.Over sized pumps aggravate the condition.4Eliminates Piping distribution networks at terrace Level. The piping cost is less compared to gravity system because of telescoping design.At least one pump must operate continuously, even for extremely small demands.5Best available option for sloped roof terracesThe pumps must operate over a wide range of capacities. The maximum operating efficiency of the pumps is lost. Operating costs is higher. At least one pump is always running. The horse power of the pumps is always greater than is required for the gravity tank system. The pumps do not always operate at the optimum point on their curves to achieve max effeciency.

User Avatar

Your Answer

Still Have Questions?

Related Questions

Difference between change in supply and change in quantity supply?


What is the Difference between supply voltage and input voltage?

no difference...

What is difference between individual supply curve and market supply curve?

The difference between individual supply curve and the market supply curve is tat individual supply curve is like a firm. To be able to get the market supply curve you have to have the individual supply curve.

What is the difference between supply function and supply curve?

supply function can be defined as the quantity of a good.

What is difference between provide and supply?

in business

What is the difference between price and supply?

The relationship between these things is that supply and demand work together to determine the price of a good or service.

What is the difference between a supply and demand?

Availablity versus demand

What were the difference between the north and south supply lines?

we have textbooks

What is the difference between individual supply and market supply?

One says individual and the other says market!

What is difference between SMPS And UPS?

The Main difference between a Switched Mode Power Supply and an Uninteruptable Power Supply is the function. SMPS are like a conditioner of electricity supply for a building, house, etc. UPS are the emergency backup power supply for vital computer based systems

Difference between an increase in Supply and an increase in quantity supplied?

check your answer

What is the difference between refrigeration and air conditioning?

One difference between air conditioning and refrigeration is the circulation systems. The point of supply for the gases they use is another difference.

What is the difference between the supply and the supply curve?

Supply is the quantities of commodities in a producer willing and able to offer for sale for a particular period of time while supply curve is the use of graphical method to show the relationship between the price and the quantity supply.

What is the difference between supply side gaps and demand side gaps?

Supply is the amount produced and demand is the amount that is wanted.

What is the difference between chillers and cooling towers?

The main difference between chillers and cooling towers is that a cooling tower uses pumps to circulate a water supply. On the other hand, a chiller uses a fan to circulate the water supply.

What is the difference between a rectifier and a power supply?

A power supply supplies power. A rectifier converts Alternating Current to Direct Current

Is there a difference between three phase and single phase electrical supplies?

Yes, there a difference between three phase and single phase electrical supply services.

What is the difference between AC and DC supply?

Why transformer rating is measured in KVA but not in KW

What is the inflationary gap?

its the difference between long run and short run aggregate supply

Difference between Indian and pak rupees?

Because of forex market and demand & supply

Difference between back EMF and induced EMF?

Backemf is supply voltage not apoosed

What is the difference between supplemental and supplementary?

They are both adjectives meaning 'added to supply what is needed'.

What is the difference between supply side and demand side?

THE ANSWER IS IN YOUR BRAIN ! you people are reaaly dumb

What is the difference between well and tubewell?

The difference between a well and tubewell are the amounts of water they supply. Wells can supply any amount to certain locations like crops. Tubewells involve pumping ground water in specifically measured amounts.

What is the difference between a spores and a seeds?

The main difference between a spore and a seed is the fact that seeds come with their own generous supply of food for the emerging shoots and roots.

Still have questions?