STRAINERS FOR CHEMICAL INDUSTRY
AND PROCESS ENGINEERING












 


CONVINCING TECHNOLOGY


AT A GLANCE




• available in sizes d 20 to d 200 mm
• low pressure loss
• long service life
• baskets made of PVC U, PVC C, PP and stainless steel
• perforation of the baskets from 40 micron to 4,8 mm
• easy cleaning of the baskets
• single and double units available
• alternative operation modes according to application
• made of PVC U, PVC C ,PP and transparent copolyester
• silicone-free  O-ring seals











STRAINER


FOR PROTECTION OF PLANT COMPONENTS




Flowing liquids in pipe systems might be polluted by substances, which could lead to blocking the system and failure of plant components. For this reason, strainers are inserted either at the entry point of the fluid into specific parts of a pipe system, or directly upstream vulnerable plant parts (e.g. valves or pumps).


LOW PRESSURE LOSS
LONG LIFE



Plastic strainers find multiple applications in pipeline construction for the chemical industry and process engineering. As standard, we supply  Y-type strainers. The bodies of these strainers are put up similar to angle seat valves and Y-type one-way valves. Disadvantages are the small screening area and the low dirt absorbing capacity, with regard to the valve size. As a result of the small screening area, the pressure loss even of the clean strainer is rather high. When pollutants are in the line, this type of strainer will be blocked within shortest time.


EASY CLEANING OF THE SCREEN BASKET



Cleaning or replacing of the screen basket is a fast and trouble-free process.
The customer-provided stop-valves before and behind the strainer have to be closed, so cutting off the strainer from inlet and outlet. By unscrewing the drain plug on the housing and the ventilation plug in the cap, the strainer housing will be depressurized and partially emptied. After that, the strainer can be opened by twisting off the screw cap. The angled grips on the screw cap allow easy opening by hand.

The external thread of the housing has no contact with the medium, so that usually it is not necessary to clean the thread. The screen basket can be removed from above by means of the handle. During installation ensure that above the strainer enough space is left for dismantling (see also technical set-up and dimensions).

Our range of screen baskets you will find here.


 
 






CONNECTION VARIANTS


FOR MULTIPLE APPLICATIONS



PP/ST flanges, PE inserts, PP inserts, threaded sockets


 
 







STRAINER


FOR PROTECTION OF PLANT COMPONENTS




Should it be necessary to protect a plant or plant components against polluting substances by means of a strainer, it is most important to find a suitable basket. The basic rule is to choose a screen insert according to the particle size to be removed from the process fluid. A finer perforation or mesh size as necessary will lead to accelerated blocking of the strainer. If you have the choice between two differently perforated baskets, select the coarser one.

Guideline: Choose the mesh size resp. the perforation of the basket half the size of the particles you need to hold back.













SINGLE OR DOUBLE VERSION



When using strainers in pipe systems, there are two operating modes - normal operation and uninterrupted operation.

Normal operation means that the plant can be stopped for maintenance purposes or that it is possible to maintain the plant during daily or weekly downtimes. In this case a single-type strainer will be sufficient.

If an uninterrupted operation is required, which means that cleaning of the basket must be possible without interruption of the operation, use of a double-type strainer is indispensable. This type of strainer allows alternate use of the two strainers by switching over the combination valve. Consequently the maintenance intervals for Kwerk strainers are significantly longer.



 

 

SELECTION CRITERIA



The free flow area on the screen basket is an important aspect in the selection of strainers. Installing the strainers in pipelines with nominal sizes corresponding to the connection diameter of the housing, ensures usually that the basket has enough free flow area. Under no circumstances the pipeline should be reduced ahead of the strainer. Too small strainers will lead to high pressure loss.
Furthermore, viscosity of the process medium may also cause loss of pressure.
In case the viscosity of the medium used is higher than the viscosity of water, you should consult one of our application technicians. It might be recommended to choose a larger strainer or to operate multiple strainers in parallel, in order to reduce pressure loss.

A pressure loss on the clean strainer of more than 150 mbar shows that it is too small for that application.

After maintenance, when the basket is clean, the complete flow area is available. As soon as the basket begins to be blocked by pollutions, the relation between the pipe cross section and the flow area of the basket is getting continually smaller. Even though the strainer has been generously dimensioned, the free flow area can rather quickly get smaller than the pipe cross section. This will increase the pressure loss, reduce the flow rate through the strainer and require frequent cleaning.

Another aspect is the capability of holding back the pollutions. If for a specific application an increased pollution load has to be expected on regular basis, the basket will be filled within short time and cleaning of the basket becomes necessary. In order to extend the maintenance intervals, it is recommended to use in this case a larger strainer.



 

ESTIMATE OF PRESSURE LOSS



After having selected a strainer with suitable screen basket according to the above mentioned considerations, it is necessary to check the pressure loss arising under operating conditions.  The pressure loss has to be calculated with the following formula;

                        Q                    delta P =  pressure loss in bar 
delta P =[ ------------ ] ²        Kv = flow rate coefficient / Cv-value
                        Kv                  Q = flow rate in m³/h

The Cv-value for the particular strainer with corresponding basket, is listed in the table below.




CV VALUES - CALCULATORY ESTIMATE OF THE PRESSURE LOSS


basket particle size
in mm und µm
DN 15
d 20
DN 20
d 25
DN 25
d 32
DN 32
d 40
DN 40
d 50
DN 50
d 63
DN 65
d 75
DN 80
d 90
DN 100
d 110
DN 140
d 160
DN 200
d 200
PVC U/PVC C/PP perforated 0,8   12,6 15,1 16,8 46,2 48,7 50,4 243,4 251,8 293,7    
PVC U/PVC C/PP perforated 1,6   12,9 15,5 7,2 47,3 49,9 51,6 249,4 258,0 301,0    
PVC U/PVC C/PP perforated 3,2   16,9 20,3 22,6 62,1 65,5 67,8 327,5 338,8 395,2 608,1 456,1
PVC U/PVC C/PP perforated 4,8   19,0 22,8 25,4 69,7 73,5 76,1 367,7 380,4 443,8 702,2 526,6
1.4401 perforated 0,8   14,2 17,1 19,0 52,2 55,1 57,0 275,4 284,9 332,4 573,0 430,0
1.4401 perforated 1,2   16,3 19,5 21,7 59,6 62,8 65,0 314,2 325,0 379,2 653,8 490,4
1.4401 perforated 1,6   15,0 18,0 20,0 55,0 58,0 60,0 289,9 299,9 349,9 603,6 452,7
1.4401 perforated 2,0   18,2 21,9 24,3 66,9 70,5 73,0 352,7 364,9 425,7 734,7 551,1
1.4401 perforated 2,8   18,1 21,7 24,1 66,2 69,8 72,3 349,2 361,3 421,5 726,8 545,1
1.4401 perforated 3,2   16,9 20,3 22,6 62,1 65,5 67,8 327,5 338,8 395,2 684,2 513,1
1.4401 perforated 4,0   21,2 25,4 28,3 77,8 82,0 84,8 410,0 424,1 494,8 860,2 645,0
1.4401 perforated 4,8   19,0 22,8 25,4 69,7 73,5 76,1 367,7 380,4 443,8 766,1 574,6
1.4401 perforated 6,4   16,9 20,3 22,6 61,1 65,5 67,8 327,7 338,8 395,2 684,2 513,1
1.4401 weave   872 µm 14,5 17,4 19,4 53,2 56,1 58,1 280,6 290,3 338,7 585,2 438,9
1.4401 weave   385 µm 12,8 15,4 17,1 47,1 49,6 51,3 248,3 256,7 299,5 514,9 386,2
1.4401 weave   238 µm 11,8 14,1 15,7 43,2 45,5 47,1 227,7 235,5 274,8 474,9 356,1
1.4401 weave   179 µm 12,0 14,4 16,0 43,9 46,3 47,9 231,6 239,5 279,5 482,3 361,7
1.4401 weave   149 µm 11,8 14,1 15,7 43,2 45,5 47,1 227,7 235,5 274,8 473,4 355,1
1.4401 weave   74 µm 12,4 14,8 16,5 45,3 47,8 49,4 238,9 247,1 288,3 498,2 373,6
1.4401 weave   40 µm 11,7 14,0 15,6 42,8 45,2 46,7 225,8 233,6 272,5 471,2 353,5
 
Reserve technical changes




TECHNICAL DATA AND DIMENSIONS


- SIMPLEX STRAINER -



Housing material technical datas weight in kg content  
dimension PVC U PVC C PP-GF EASTAR** A B C D E F J K L union flange in Liter
DN 15 d 20 10,3 bar* 10,3 bar* 10,3 bar* 6,9 bar* 219 245 279 57 171 109 203 274 297 3,4 4,0 0,8
DN 20 d 25 10,3* bar 10,3 bar* 10,3* bar 6,9 bar* 219 245 279 57 171 109 203 280 297 3,4 4,0 0,8
DN 25 d 32 10,3* bar 10,3* bar 10,3* bar 6,9 bar* 219 245 279 57 171 109 203 296 297 3,4 4,0 0,8
DN 32 d 40 10,3* bar 10,3* bar 10,3* bar 6,9 bar* 324 340 343 83 241 156 327 397 394 6,4 7,5 2,7
DN 40 d 50 10,3* bar 10,3* bar 10,3* bar 6,9 bar* 324 340 343 83 241 156 327 404 394 6,4 7,5 2,7
DN 50 d 63 10,3* bar 10,3* bar 10,3* bar 6,9 bar* 324 340 343 83 241 156 327 414 394 6,4 7,5 2,7
DN 65 d 75 10,3* bar 10,3* bar 10,3* bar 6,9 bar* 384 504 406 123 377 184 438 534 566 13,0 15,0 10,6
DN 80 d 90 10,3* bar 10,3* bar 10,3* bar 6,9 bar* 384 504 406 123 377 184 438 517 566 13,0 15,0 10,6
DN 100 d 110 10,3* bar 10,3* bar 10,3* bar 6,9 bar* 384 504 406 123 377 184 438 562 566 13,0 17,0 20,6
DN 150 d 160 10,3* bar 10,3* bar       871 457 271 691 298 554 569     27,0 25,7
DN 200 d 200 10,3* bar 10,3* bar       871 457 271 691 298 740 640     36,0 34,1
 
- Technical changes reserved - * max. Operating pressure at 21 ° C - ** EASTAR - Strainer can only be used for water







TECHNICAL DATA AND DIMENSIONS


- DUBLEX STRAINER -




housing material technical datas weight in kg
dimension PVC U PVC C PP-GF EASTAR** A B C D E F G H J union flange
DN 15 d 20 10,3bar* 10,3bar* 10,3bar* 6,8bar* 105 132 693 57 397 171 521 127 279 9,0 9,5
DN 20 d 25 10,3bar* 10,3bar* 10,3bar* 6,8bar* 105 135 693 57 297 171 521 127 279 9,0 9,5
DN 25 d 32 10,3bar* 10,3bar* 10,3bar* 6,8bar* 105 143 693 57 297 171 521 127 279 9,0 9,5
DN 32 d 40 10,3bar* 10,3bar* 10,3bar* 6,8bar* 152 189 897 83 394 241 711 274 343 18,0 20,0
DN 40 d 50 10,3bar* 10,3bar* 10,3bar* 6,8bar* 152 193 897 83 394 241 711 274 343 18,0 20,0
DN 50 d 63 10,3bar* 10,3bar* 10,3bar* 6,8bar* 152 197 897 83 394 241 711 274 343 18,0 20,0
DN 65 d 75 10,3bar* 10,3bar* 10,3bar* 6,8bar* 178 250 1128 123 566 377 904 376 406 38,0 40,0
DN 80 d 90 10,3bar* 10,3bar* 10,3bar* 6,8bar* 178 243 1128 123 566 377 904 376 406 38,0 48,0
DN 100 d 110 10,3bar* 10,3bar* 10,3bar* 6,8bar* 237 299 1207 123 566 377 983 376 406 45,0 48,0
 
Technical changes reserved - * max. Operating pressure at 21 ° C - ** EASTAR - Strainer can only be used for wate






housing material technical datas weight
dimension PVC U PVC C A B C D E F G in kg
DN 150 d 160 10,3bar* 10,3bar* 887 874 218 218 438 1052 554 81,8
DN 200 d 200 10,3bar* 10,3bar* 1060 1025 293 293 438 1052 730 114,0
 
Technical changes reserved - max. Operating pressure at 21 ° C




DELIVERY RANGE SIMPLEX STRAINERS



Please note:
- besides the standard program, we supply also customized connection variants.
- sealing material EPDM, also available in FPM on request.. The PP version can be delivered only in FPM,



dimension connection PVC U PVC C PP-GF Transparent
DN 15 d 20 socket SB-1050-K-EPDM SB-2050-K-EPDM   SBC050-K-EPDM
DN 15 R 1/2 Zoll threaded socket SB-1050-G-EPDM SB-2050-G-EPDM SB4050-G-FPM SBC075-K-EPDM
DN 15 d 20 PE inlay part SB-1050-PE-EPDM SB-2050-PE-EPDM SB4050-PE-FPM SBC050-PE-EPDM
DN 15 d 20 PP inlay part SB-1050-PP-EPDM SB-2050-PP-EPDM SB4050-PP-FPM SBC050-PP-EPDM
DN 15 d 20 PP/steel flange SB-1050-F-EPDM SB-2050-F-EPDM SB4050-F-FPM SBC050-F-EPDM
             
DN 20 d 25 socket SB-1075-K-EPDM SB-2075-K-EPDM   SBC-075-K-EPDM
DN 20 R 3/4" threaded socket SB-1075-G-EPDM SB-2075-G-EPDM SB-4075-G-FPM SBC-075-G-EPDM
DN 20 d 25 PE inlay part SB-1075-PE-EPDM SB-2075-PE-EPDM SB-4075-PE-FPM SBC-075-PE-EPDM
DN 20 d 25 PP inlay part SB-1075-PP-EPDM SB-2075-PP-EPDM SB-4075-PP-FPM SBC-075-PP-EPDM
DN 20 d 25 PP/steel flange SB-1075-F-EPDM SB-2075-F-EPDM SB-4075-F-FPM SBC-075-F-EPDM
             
DN 25 d 32 socket SB-1100-K-EPDM SB-2100-K-EPDM   SBC-100-K-EPDM
DN 25 R 1" threaded socket SB-1100-G-EPDM SB-2100-G-EPDM SB-4100-G-FPM SBC-100-G-EPDM
DN 25 d 32 PE inlay part SB-1100-PE-EPDM SB-2100-PE-EPDM SB-4100-PE-FPM SBC-100-PE-EPDM
DN 25 d 32 PP inlay part SB-1100-PP-EPDM SB-2100-PP-EPDM SB-4100-PP-FPM SBC-100-PP-EPDM
DN 25 d 32 PP/steel flange SB-1100-F-EPDM SB-2100-F-EPDM SB-4100-F-FPM SBC-100-F-EPDM
             
DN 32 d 40 socket SB-1125-K-EPDM SB-2125-K-EPDM   SBC-125-K-EPDM
DN 32 R 11/4" threaded socket SB-1125-G-EPDM SB-2125-G-EPDM SB-4125-G-FPM SBC-125-G-EPDM
DN 32 d 40 PE inlay part SB-1125-PE-EPDM SB-2125-PE-EPDM SB-4125-PE-FPM SBC-125-PE-EPDM
DN 32 d 40 PP inlay part SB-1125-PP-EPDM SB-2125-PP-EPDM SB-4125-PP-FPM SBC-125-PP-EPDM
DN 32 d 40 PP/steel flange SB-1125-F-EPDM SB-2125-F-EPDM SB-4125-F-FPM SBC-125-F-EPDM
             
DN 40 d 50 socket SB-1150-K-EPDM SB-2150-K-EPDM   SBC-150-K-EPDM
DN 40 R 11/2" threaded socket SB-1150-G-EPDM SB-2150-G-EPDM SB-4150-G-FPM SBC-150-G-EPDM
DN 40 d 50 PE inlay part SB-1150-PE-EPDM SB-2150-PE-EPDM SB-4150-PE-FPM SBC-150-PE-EPDM
DN 40 d 50 PP inlay part SB-1150-PP-EPDM SB-2150-PP-EPDM SB-4150-PP-FPM SBC-150-PP-EPDM
DN 40 d 50 PP/steel flange SB-1150-F-EPDM SB-2150-F-EPDM SB-4150-F-FPM SBC-150-F-EPDM
             
DN 50 d 63 socket SB-1200-K-EPDM SB-2200-K-EPDM   SBC-200-K-EPDM
DN 50 R 2" threaded socket SB-1200-G-EPDM SB-2200-G-EPDM SB-4200-G-FPM SBC-200-G-EPDM
DN 50 d 63 PE inlay part SB-1200-PE-EPDM SB-2200-PE-EPDM SB-4200-G-FPM SBC-200-PE-EPDM
DN 50 d 63 PP inlay part SB-1200-PP-EPDM SB-2200-PP-EPDM SB-4200-PE-FPM SBC-200-PP-EPDM
DN 50 d 63 PP/steel flange SB-1200-F-EPDM SB-2200-F-EPDM SB-4200-F-FPM SBC-200-F-EPDM
             
DN 65 d 75 PP/steel flange SB-1250-F-EPDM SB-2250-F-EPDM SB-4250-F-FPM SBC-250-K-EPDM
DN 80 d 90 PP/steel flange SB-1300-F-EPDM SB-2300-F-EPDM SB-4300-F-FPM SBC-300-G-EPDM
DN 100 d 110 PP/steel flange SB-1400-F-EPDM SB-2400-F-EPDM SB-4400-F-FPM SBC-400-K-EPDM
DN 150 d 160 PP/steel flange SB-1600-F-EPDM      
DN 200 d 200 PP/steel flange SB-1800-F-EPDM      
 
Technical changes reserved - max. Operating pressure at 21 ° C




INFORMATION TO OUR DELIVERY PROGRAM



Plastic pipe systems


Overview of plastic pipe systems
Technical information on ABS pipe systems
Technical information on PVC  U pipe systems
Technical information on PVC  U transparent pipe systems
Technical information on PVC  C pipe systems
Technical information on PP pipe systems
Technical information on PP-R pipe systems
Technical information on PE pipe systems
Technical information on PVDF pipe systems

Chemiedur - pipe


Technical information on UP-GF (FRP) pipe systems
UP-GF (FRP) pipes
UP-GF (FRP) molded parts and connection
UP-GF-PP (FRP) molded parts and connection
UP-GF (FRP) adhesive collars
UP-GF (FRP) loose flanges

Plastic pipes


Calculator for cutting pipes
Guidelines for sawing plastic pipe
Leftovers in plastic pipe
Standardization of plastic pipes and molded parts
PVC U pipes deviations
Pressure loss in pipe systems out of PVC U, PVC C and ABS pipe systems
Distinction between Rp, R and G threads
Screw lengths for flange connections

Plastic fittings


PVC U transparent ball valves
Diaphragm valves
Block valves
Butterfly valves
Plastic needle valves
 

Plastic Valves according to ATEX


New EU guideline 2014/34/EU
Plastic Valves in EX zones
Y-Strainers PP-EL DN 15 - DN 50
Check valves PP-EL DN 15 - DN 50
Angle seat valves PP-EL DN 15 - DN 50

Bonding of plastic pipes


Bonding manual
Video showing the bonding of pipes

Plastic welding


Guidelines for extrusion welding


Grids / support grids


GFK grids
Grids out of PP -el electrically conductive
Profile support grids out of PP -el electrically conductive


Molded ventilation parts


Ventilation technology


Chemical hose


PVC transparent hose with fabric inlay


Industrial tanks and chemical containers


Dosing tanks and outer containers 35 – 1000 Liter
Salt dissolving tanks 60 -5000 Liter
Storage tanks and vats
Storage tanks for water
Safety and collecting troughs
Industrial tank delivery program
Dosing tanks with agitator
Dosing tank agitators
Dosing tanks with attachments
Dosing tanks made of sheet material
Customized chemical containers
Dosing tanks with level indicators



 

IBC TANKS/CONTAINERS


IBC screw caps DN 150/DN 200
IBC adapters out of PE
IBC adapters out of PP
MULTI FLEX BLOCK for IBC BULK CONTAINER



Attachment parts for tank construction


Vapor separators
CO2 - absorbes
Manholes
Revision nozzles
Block flange

Filter housings and filter cartridges


PENTEK 3G Slime Line filter housings
PENTEK 3G Standard filter housings
PENTEK Big Blue filter housings
PENTEK PP high temperature filter housings
PENTEK PP all nature filter housings
PENTEK filter bags for Big Blue filter housings
PENTEK surface filter cartridges
PENTEK filter cartridges for depth filtration
PENTEK filter cartridges with activated carbon
CINTROPUR filter systems
CINTROPUR water filters

Flange configurator


Blind flanges, loose flanges,  rectangular flanges

Chemical resistance


Table of chemical resistance for plastic pipe systems
 

Machined plastic parts


Inserts
Screw-in parts
Threaded fittings
Screw fittings

Milled plastic parts


Loose flanges and blind flanges made of sheet material

Static mixers


Static mixers made of plastic

Strainers


Single-type and double-type strainers
Pot strainer DN 300
Angle seat strainer DN 500


Flow meters


Variable area flow meters
Configuration tool for flow meters

Filter presses


Laboratory filter presses

Injection molded parts


Scraper made of PE for filter press


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