Monday, October 26, 2009

FILTRATION

Filter requirements are determined by the quality of the water source and the requirement of the particular emitter. Screens of various mesh size are the most common filtration device. Graded gravel and sand filters with back flushing capabilities can also be used. If large quantities of very fine sand are to be removed, a vortex separator is very efficient. A vortex separator will not remove organic debris and requires another filter (such as a screen), if this is a problem. Settling ponds are an efficient means of removing very large quantities of sand ans silt. Filtration of the mineral and organic particles from the water entering the system is of prime importance to the continued serviceability of a trickle system. A trickle system should receive 100% filtered water or no water at all



Plastic filters
Plastic filters 120 mesh filter element for 1 inch size
Plastic filters 120 mesh filter element for 11/2 inch size





Epoxy coated steel screen filtersSteel screen filter 120 mesh



Replaceable filter element Of size 3 inch flow 36 m/ hr

4 inch 72 m/ hr 6 inch 125 m/hr

Replaceable filter element Of size 3 inch flow 36 m/ hr
4 inch 72 m/ hr 6 inch 125 m/hr


Chemical injection.

An irrigation system offers the possibility of applying various chemicals through the system. Many different kinds of equipment are available for these applications. Fertilizers can be applied through a trickle system. Phosphorous is not recommended for the application through a trickle system due to problems with its solubility in water, its likelihood of precipitating and clogging emitters, and its immobility in soil.

Nitrogen fertilizers generally work well in trickle applications. Anhydrous ammonia and aqua- ammonia generally don’t work well due to volatilization of gaseous ammonia and precipitation of soluble calcium and magnesium that may be in the water. Potassium oxide works well in the trickle systems.

Caution should be used in supplying trace elements through a trickle system due to the low quantities needed, possible reaction with salts in the water and the possibility of excess levels being toxic. Chlorine (5-10ppm) can be injected into the trickle system to combat algae growth.

Acid can be injected into the system to remove bicarbonate buildup.
Herbicides can be be injected to control weed growth around emitters. Other chemicals may be suitable for irrigation application. Any unfamiliar compound being injected into an irrigation system first is tested for compatibility with system materials.




Epoxy coated fertilizer tank Inlet size ½ inch bsp female
Outlet size ½ inch bsp female Drain valve connection
1 inch size female Air relief valve connection ½ inch
Max operating pressure 8 bar

Figure shows the fertilizer tank and their spare parts.


Cleaning.
Fine sand, silt and clay tend to settle out in the slow flow at the ends of submains and laterals. Valves or capped ports should be placed at the end of each lateral and along submains to allow the periodic flushing of fine particles from the system.

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