Manufacture of electric heating elements, high-power and high-voltage resistors, and voltage measurement systems for industry
Schniewindt GmbH & Co. KG
Neuenrade · Schöntaler Weg 46New on Amplifa
About Schniewindt
Schniewindt is an owner-managed family company founded in 1829, headquartered in Neuenrade (Sauerland), today managed by the sixth generation. The company, with around 200 employees worldwide, develops and manufactures electric heating technology (tubular heaters, screw-in heaters, cartridge heaters, flange heaters, flow heaters, air heaters, industrial immersion heaters) as well as customer-specific high-power and high-voltage resistors such as braking, earthing, discharge and filter/damping resistors based on the Schniewindt grid invented in 1902. A third pillar is power transmission technology with RC voltage dividers for voltage measurement up to 1100 kVDC. Production is mainly from stainless steels (including 1.4404, 1.4435, 1.4571, 1.4539) and nickel alloys; the manufacturing spectrum includes fusion welding according to ISO 3834-2, the manufacture of pressure equipment under Module H, as well as engineering, assembly and commissioning of complete systems, such as electric steam generation systems in containers. Customers include mechanical and plant engineering, chemical plant construction, pharmaceutical technology, energy technology, thermal process engineering, rail transport and naval technology; deliveries are made worldwide via trading partners.
- Site
- Neuenrade
- Processes
- Manufacture of electric tubular heaters (Ø 6.5/8.5/11.5/16 mm), Manufacture of flange heaters up to 10000 kW (NW 1000), Manufacture of screw-in heaters (including Ex version up to 21 kW), Manufacture of cartridge heaters/heating cartridges (including Ex version, high-power heating, Manufacture of flow heaters up to 10000 kW, Manufacture of air heaters (up to 2000 kW, overpressures up to 500 mbar, up to 650°C), Manufacture of industrial immersion heaters and tank heaters (up to 20 kW), Manufacture of explosion-proof heating elements (Ex d, Ex de, Ex det, zones 1 and 2)
- Materials
- Stainless steel, Nickel alloy, Nickel 200, Painted steel, Stainless steel (band elements), Stainless steel 1.4404, Stainless steel 1.4435, Stainless steel 1.4571
- Certificates
- ISO 9001:2015, ISO 14001:2015, ATEX QAN (BVS 24 ATEX ZQS/E401, Directive 2014/34/EU Annex IV/VII), DIN EN ISO 3834-2, DNV Approval of Manufacturer (welded pressure equipment class I & II), Module H (Pressure Equipment Directive 2014/68/EU), AD 2000-HP0, PED Annex I No. 3.1, EN 15085-2 (welding of rail vehicles), EN 1090-1, CCC (93Ex, 94Ex, 95Ex), ATEX (2014/34/EU Annex IV/VII), DNV Approval of Manufacturer, Module H (2014/68/EU), EN 15085-2
- Founded
- 1829
- Employees
- approx. 200
- Industries
- Mechanical and plant engineering, Chemical plant construction, Pharmaceutical technology, Energy technology, Petrochemicals, Thermal process engineering
- 01
Engineering/design
- 02
Manufacture of heating elements and resistors
- 03
Fusion welding/housing construction
- 04
Assembly including control technology
- 05
Testing (VT, LT, PT) and approvals
- 06
Commissioning at the customer
Materials & Processes
Stainless steel 1.4404
Stainless steel for heating elements in food technology and chemistry with high corrosion resistance requirements.
Stainless steel 1.4435
Used in food technology applications with defined surface roughness and dead-space-free design.
Stainless steel 1.4571
Material for braking resistors and heating elements with increased temperature and corrosion resistance.
Stainless steel 1.4539
High-alloy stainless steel for braking resistors under aggressive environmental conditions.
Nickel alloy 2.4851
Active material for resistors at high operating temperatures.
Nickel 200
Conductor material for temperature-resistant connecting wires up to approx. 1,200 °C for resistors.
Steel
Steel, also painted, for housings, resistors and pressure equipment.
Fusion welding according to ISO 3834-2
Certified welding of metallic materials for pressure equipment and systems.
Location
Neuenrade
DEHeadquarters, engineering and manufacturing
- Materials
- Steel, stainless steel, nickel alloys
- Tubular heater manufacture up to 7,000 mm length
- Welding production (ISO 3834-2, DNV)
- Pressure equipment manufacture (Module H)
Components & Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Manufacture of electric tubular heaters (Ø 6.5/8.5/11.5/16 mm)Surface | – | 7000 mm | – | – | Stainless steel |
| Manufacture of flange heaters up to 10000 kW (NW 1000)Surface | – | – | – | – | Stainless steel |
| Manufacture of screw-in heaters (including Ex version up to 21 kW)Surface | – | – | – | – | Stainless steel |
| Manufacture of cartridge heaters/heating cartridges (including Ex version, high-power heatingSurface | – | – | – | – | Stainless steel |
| Manufacture of flow heaters up to 10000 kWSurface | – | – | – | – | Stainless steel |
| Manufacture of air heaters (up to 2000 kW, overpressures up to 500 mbar, up to 650°C)Surface | – | – | – | – | Stainless steel |
| Manufacture of industrial immersion heaters and tank heaters (up to 20 kW)Surface | – | – | – | – | Stainless steel |
| Manufacture of explosion-proof heating elements (Ex d, Ex de, Ex det, zones 1 and 2)Surface | – | – | – | – | Stainless steel |
| Manufacture of resistors (braking, earthing, discharge, pre-charge, filter/damping resistors)Surface | – | – | – | – | 1.4404, 1.4571, 1.4539, 2.4851, Nickel 200 |
| Manufacture of RC voltage dividers for voltage measurement up to 1100 kVDCSurface | – | – | – | – | Composite material |
| Fusion welding of metallic materials (DIN EN ISO 3834-2 certified, DNV weld inspection)Joining | – | – | – | – | Steel, Stainless steel |
| Manufacture of pressure equipment (pressure vessels, heat exchangers, thermal oil heaters)Casting | – | – | – | – | Steel, Stainless steel |
| Manufacture of steam generators and complete plants including control technology (engineering,Engineering | – | – | – | – | Steel, Stainless steel |
| Non-destructive testing (VT, LT, PT by in-house personnel)Testing | – | – | – | – | – |
Additional services
Reference customers
Quality & Approvals
Schniewindt manufactures according to a certified quality management system (ISO 9001:2015, ISO 14001:2015) with in-house non-destructive testing (VT, LT, PT) by qualified personnel. Approvals include ATEX, DNV, Module H (Pressure Equipment Directive), AD 2000-HP0, EN 15085-2 and EN 1090-1.
| Evidence | Neuenrade |
|---|---|
| ISO 9001:2015 | |
| ISO 14001:2015 | |
| ATEX (2014/34/EU Annex IV/VII) | |
| DIN EN ISO 3834-2 | |
| DNV Approval of Manufacturer | |
| Module H (2014/68/EU) | |
| EN 15085-2 | |
| EN 1090-1 |
History
- 1829
Founded by Carl Schniewindt in Altena; the company later moved to Neuenrade.
- 1902
Invention of the "Schniewindt grid", the beginning of the success story in electric resistance technology.
- 2021
Start of the Haru Oni project: development of an electric steam generation plant (850 kW flange heater) in two 20-foot containers for the e-fuel pilot plant in Chile.
- 2022
Delivery of the container-based plant to South America in spring.