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PSF - PRESSURE SAND FILTER

Introduction ::

Water contains three major impurities Physical, Biological, Chemical. Physical impurities troubles in various industrial, commercial and domestic applications hence for better quality physical impurities required to reduce up to application standards.

Physical impurity is decreased by filtration, various kind of filtration system available for different application with different sharpness of removal in macro to micron.

Process ::

This is a Stainless Steel inside Rubber Lining (SSRL) pressure vessel, with internal distribution & collection systems. The frontal and inter connecting pipes and requisite ITALIC valves of BRASS construction along with one lot of sand, silex & pebbles. The necessary instruments like inlet / outlet, pressure gauges are provided with the system.

Function ::

The physical impurities of raw water i.e. suspended solids, dirt, dust, & all visible particles are removed in PRESSURE SAND FILTER up to 50 micron.

Resultant ::

The system reduces the physical impurity load to less then 2 ppm the system can take load of 20 ppm -25 ppm of suspended solutions.

Product Description ::

A typical pressure sand filter consists of a pressure vessel-this could be either vertical or horizontal-fitted with a set of frontal pipe work and valves, graded sand supported by layers of graded under bed consisting of pebbles and silex, a top distributor to distribute the incoming water uniformly throughout the cross section of the filter, and an under drain system to collect filtered water. Fig 1 shows the arrangement of a vertical pressure sand filter.

Working Principle ::

In pressure sand filter raw water flows down wards through the filter bed and as the suspended matter- which has usually been treated by addition of a coagulant like alum- is retained on the sand surface ands between the sand grains immediately below the surface. There is steady rise in the loss of head as the filtration process continues and the flow reduces once the pressure drop across the filter is excessive.

The filter is now taken out of service and cleaning of the filter is effected by flow reversal. To assist in cleaning the bed, the backwash operation is often preceded by air agitation through the under drain system. The process of air scouring agitates the sand with a scrubbing action, which loosens the intercepted particles. The filter is now ready to be put back into service.

Vertical Pressure Sand Filter

Horizontal Pressure Sand Filter

Operating Data ::

Capacity : Up to 100 M3 and Above

	* No of stream (As per design standards) . . . One and More
	* Mode of Plant Operation . . . Manual
	* Feed Water Flow Rate . . . 1 M3/Hr and above
	* Feed Water Pressure . . . 2.0-3.5 Kg/Cm2
	* Working hours / day . . . 20 Hrs.
	* Product Water produced/day . . . As per design std. Up to 100 m3 and Above

Feed Water Limited Conditions ::

	Turbidity ..... <1 NTU S.D.I. <5
	Heavy Metal ….. Nil
	Microorganism ….. Nil
	Oil & Grease ….. Nil
	BOD & COD ….. Nil
	Residual chlorine ….. Nil
	Temperature Deg. C. (Max.) ….. < 40
	Odor ….. Odorless

Water Route ::

Multi Media Filter

Type	Upflow / Downflow
Quantity Offered	One
Material of Construction	SSRL 316 L-Rubber lining
Operating Pressure	2.0 kg-Min-2.5 kg-Normal-3.5 kg-Max
Backwash Pressure	3.5 kg-Max
Operating Flow Rate	1 m3/hr and Above
Type of Media	Sand
Supporting Media	Gravels & Silex
Distribution System	One
Collecting System	One

Shell

Diameter - As per Design Standard (mm)
Height - As per Design Standard (mm)
Thickness - As per Design Standard (mm)
R.L. Thickness : As per Design Standard (mm)

Pipe

Pipe	Service	Backwash	Regn
Type	Sch.10	Sch.20	-
MOC	SS-316 L	AP
Size (Dia.)	As per Design Standard (mm)
Qty.	One lot	One lot	One lot

Valve

Type	Ball Valve
MOC	SS Outer Cover Brass
Size	As per Design Standard (mm)
Make	Italy - Imported
Qty.	5 Nos.