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Building Excellence with High-Quality Plastic Tanks - Trust Kwerk GmbH for Your Demanding Applications


Plastic Tanks for Water Treatment, Chemical, and Process Engineering

Discover a comprehensive selection of high-quality plastic tanks for various applications in water treatment, chemical, and process engineering at Kwerk.de. Our product range includes dosing tanks, salt dissolvers, storage tanks, containment and cylindrical tanks, spill trays, holding racks, and custom-made solutions in the field of plastic tank construction. Our tanks are characterized by their chemical resistance, smooth interior walls, and seamless production using rotational melting processes. We offer a variety of options such as acid vapor separators, PE welding fittings, tank connectors, pipelines, optical and electrical level indicators, plastic fittings, steel frames, agitators, and much more. All common plastic tanks are available directly from stock.

Precision-Crafted Plastic Tanks and Accessories According to Your Requirements

Our experienced tank construction department manufactures welded thermoplastic cylindrical and rectangular tanks in accordance with DVS guidelines. We also offer custom-made special constructions such as process tanks, storage tanks, mixing tanks, dosing tanks, spill trays, and all necessary accessories. With our workshop and a dedicated team of technicians, we are available to provide you with expert advice in selecting the right plastic tank.

Cylindrical and Rectangular Tanks for Versatile Applications

Our plastic cylindrical tanks are standing tanks with a flat, welded bottom. They are manufactured using extrusion welding processes from seamless casing pipes or welded plates. With various lid and bottom options, as well as the necessary accessories, we offer flexible design possibilities. Before delivery, all tanks undergo leak testing and are provided with a factory certificate. To eliminate possible transport damage, we recommend conducting a trial filling with water before initial filling with the medium. The installation of the tanks requires a level foundation or installation surface and a secondary containment basin. Our rectangular tanks made of PP in accordance with DVS guidelines offer a space-saving solution with a large useful volume. They are custom-made and supplied with reinforced steel or stainless-steel frames. Thanks to a modular construction system, rectangular tanks can be prefabricated and adjusted and installed on-site as needed. Our rectangular tanks are made of high-quality PP, PE, PVDF, and other materials also used in cylindrical tanks.

At Kwerk.de, you will receive first-class quality at fair market prices. We prioritize precision and provide tailor-made solutions for your individual requirements. Please feel free to contact us for further information or personal consultation

Optimize your shopping experience with our detailed delivery information

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
Pot Strainer DN 200 - DN 500 Inliner PP/FRP Coated
Pot Strainer DN 200 - DN 500 Inliner FRP/CBL Coated
Angle Seat Strainer DN 200 - DN 400 Inliner FRP/CBL Coated
Manhole mad of FRP and PP/FRP

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 screw caps DN 150/DN 200
IBC adapters out of PE
IBC adapters out of PP

Attachment parts for tank construction

Vapor separators
CO2 - absorbes
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

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


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

Kwerk Practice Blog

The Kwerk team blogs from the field here

Partnership at the highest level.