Filterautomat

GB

The New Definition of Purity for Your Medium

Cooling Water Plate Heat Exchangers

River Water Spray Nozzles

Sea Water

Piping Systems Sinter and Scale Separation

Mechanical Seals Emulsions

Process Water Pumps

Mussel / Mussel Larvae Micro Filtration Separation

flow rate 5 m3/h to 10,500 m3/h

filter fineness ≥ 5 µm

operating pressure 0.8 to 63 bar

pressure loss with clean filter 0.1 to 0.3 bar

flange DN 50 to DN 1,000

temperature – 10 to + 110 °C automatic backwash ✓

Scope of Delivery voltage 230 V or 400 V • voltage 110 V to 690 V ∆ Pressure Equipment Directive (PED) • ASME ∆ explosion protection ∆ differential pressure gauging • differential pressure as 4 - 20 mA-signal ∆ automatic filter control • self-medium backwash • backwash with suction pump ∆ electric or pneumatic backwash valve • signal exchange with PLC • electrical cabling incl. connectors • documentation • certificates • ∆ functional test at manufacturer’s works •

included in the scope of delivery • available at extra charge ∆ Fig. 1

standard design sea water resistant design special design filter housing grey-cast iron nickel resist steel, stainless steel filter element stainless steel stainless steel stainless steel

Fig. 2 filter system on skid incl. backwash pump

Fig. 3 river water filtration for cooling plant

Fig. 4

Fig. 4 sealing water filtration in power plant

E

Filtration Process

The raw water enters the filter through the raw water inlet and disperses in the outer ring of the housing. Then it flows upwards in the housing and penetrates the three- part filter drum from outside to inside.

The filter drum rotates with approx. 5 - 7 rpm for ensuring an even loading on the filter element. The impurities contained in the raw water are thus retained on the outside of the segment-like openings of the filter drum’s outer part. The cleaned water leaves raw water inlet clean water outlet the filter through the clean water outlet.

Fig. 5

Fig. 6 Fig. 7

Filter Drum Sectional View

The filter drum consists of two rigid supporting cages, one in During assembly the upper part of the fil- another. The filter element is placed between these cages. Be- ter is inserted in the housing. The lower cause of their conical construction all three parts can be precisely part of the filter drum is centered by a fixed and screwed together. For protection against corrosion the ring surface in the filter housing. supporting cages are layered with a premium powder coating.

E

Backwash Process

The backwash process is triggered off by a defined differential pressure (pressure difference between raw and clean water side). Additionally an adjustable time lag relay in the electric con- raw water clean water trol permits the start of the backwash process. inlet outlet The filter cleaning starts off with the opening of the motor driven backwash valve. This leads to atmospheric pressure in the back- wash pipe and the backwash canals in the filter housing. Due to the overpressure on the clean water side in the filter drum the so- lids retained on the filter element’s outside are now compulsorily backwashed to atmosphere contrary to the filtration direction.

The rotating filter drum passing the backwash canals ensures a 100 % cleaning of the filter element. After 15 - 20 seconds the backwash process is finished and the backwash valve closes automatically.

Fig. 8 backwash water outlet During backwashing the filtration process is not interrupted.

Fig. 9 Fig. 10

Filter Drum Segments Filter Housing

Even rougher parts can be retained in The filter housing is coated with a two-component epoxy resin the segment-like openings of the filter as standard. Two backwash canals are situated on opposite drum’s outer part. During backwashing sides of the filter housing. Their backwash ports are entirely these are then flushed out of the system. closed off by seal surfaces, which prevent the raw water from entering the backwash canals during backwashing. Filter Element

The Slotted Sieve on the basis of welded stainless steel triangular support rods very sturdy design manufacturable in different stainless steel qualities filter fineness ≥ 30 µm ≥ 30 µm

The Wire-Cloth Screen the cloth is clamped in sandwich structure by two supports better utilization of the net filter area manufacturable in different stainless steel qualities ≥ 5 µm Fig. 12 filter fineness ≥ 5 µm Inspection Port The Perforated Plate rolled perforated plate with The filter housing’s construction with an inspection port along staggered perforations the length of the whole filter element provides insight into the manufacturable in different interior. Due to the slow rotation of the filter drum the complete stainless steel qualities filter element can be inspected. ≥ 350 µm filter fineness ≥ 350 µm Fig. 11

Fig. 13 Fig. 14

Venturi Nozzle and Backwash Valve Differential Pressure Gauging

The venturi nozzle is dimensioned according to the condi- Consisting of: tions at site for regulating the necessary backwash water optical inlet-pressure indicator amount and for avoiding pressure fluctuations in the piping optical indicator of the differential pressure system. As standard the backwash valve is equipped with an 2 adjustable micro-switches electric or a pneumatic drive. start filter backwash alarm signal with the customer’s control system (PLC): system control customer’s the with exchanges signal following the includes control standard The operation. filter automatic afully ensuring thus pressure differential and time / on depending off or started is process backwash The Control Electric loss. pressure related the and hour per rate flow the of function a as sizes filter the shows 18) (fig. chart The performance and the raw of water’s contamination. degree loss, pressure admissible maximal the fineness, its element, filter of choice the rate, flow the on depends size filter The Filter Determination Size Fig. 15 Fig. 17 external release of the backwash process backwash the of release external process backwash the of starting external backwashing is filter operation for ready indication fault collective

D = disassembly of filter drum

C

E B backwash pipe A DN 1 filter drive filter

DN inspection port µm filter fineness filter µm 400 for Chart Performance

Fig. 16 economical filter. economical an quote then will We us. contact please finenesses other The shown lines are valid for a filter fineness400 of µm. For 1000 Type 900 600 300 500 800 400 250 700 100 150 200 80 50 Fig. 18 1000 900 600 300 500 800 400 200 250 700 100 150 DN 80 50 2380 2380 1320 1575 1575 1145 600 800 660 400 530 320 470 3 915

flow rate in m /h A 490 485 485 225 225 280 720 240 720 180 150 125 425 318 B dimensions inmm differential pressure in bar in pressure differential 2040 2850 2850 1306 1805 1560 4250 4250 1221 2610 1121 879 978 791 C 3000 1800 1300 2320 5700 5700 2750 1670 1020 4160 1470 4150 4150 1150 D 1390 1390 1107 1107 600 362 939 775 381 275 192 475 241 416 E DN 200 200 100 100 100 150 150 50 80 80 50 50 50 32 1 weight 10000 10000 in kg 3600 4500 4500 1800 2770 1250 500 660 450 250 320 160 output motor in kW 0,55 0,55 1,50 1,50 1,50 1,50 1,50 1,50 0,37 0,75 0,75 0,75 3,0 3,0

Process Diagram

electric control unit

power supply

customer DDS

differential pressure manometer with 2 contacts

raw water clean water

automatic backwash valve customer DDS DDS customer backwash water pipe

bypass DDS customer

Fig. 19

Advantages high backwash speed (up to 4 - 10m/s) 100 % cleaning of the whole filter surface small water loss for backwashing robust construction crushing of coarse particles fine filtration ≥ 5 µm possible constant charging of the whole filter surface insert of slotted sieve, wire-cloth screen or perforated plate easy to maintain because of the inspection port inline construction tested unit with ready-made cabling Fig. 20

P.O.Box 100203 • 57002 Siegen • Hagener Straße 103 • 57072 Siegen, Germany Phone +49 (0) 271-401-4123 • Fax +49 (0) 271-401-4135 • E-mail: [email protected] www.dds-filter.com 09/2016 © Nutzwert Design