
Plant construction, vessel construction, steel construction and engineering for renewable energy and process engineering from the Salzburg Lungau region.
Stefan Ritzer GmbH
Mauterndorf (Austria)New on Amplifa
About us
Stefan Ritzer GmbH is a medium-sized plant construction company from Mauterndorf in the Salzburg Lungau region. The company produces customised solutions in the fields of plant construction, vessel construction, steel construction and engineering – including pressure vessels, buffer storage tanks, storage tanks, mixing vessels, flue gas condensation and heat recovery systems, air preheaters, steam generators and district heating transfer stations as compact stations and custom-made units. Production is mainly in steel and stainless steel; the in-house production includes plasma cutting, welding, pickling and painting in a 1,500 m² production hall. The range of services extends from basic engineering through design and manufacturing to installation including assembly supervision. Customers include the energy and timber industries, process engineering, the food sector as well as the Salzburg Festival, for which the steel structures for the stage of 'Jedermann' were produced in 2017. The company is certified, among others, to EN 1090-2, AD 2000 (HP0/HP100R), §14 Boiler Act and EN ISO 3834-2.
- Site
- Mauterndorf
- Processes
- Plant construction, Vessel construction (pressure vessels, buffer storage tanks, storage tanks, mixing vessels), Steel construction (steel structures), Engineering (basic engineering, design), Installation (on-site installation, assembly supervision), Plasma cutting, Pickling, Painting
- Materials
- Stainless steel, Steel, Special materials for pressure vessels, Glass, Plasma cutting, Pickling, Painting
- Certificates
- EN 1090-2, AD 2000 HP0 and HP100R, §14 Boiler Act, EN ISO 3834-2, AD 2000 HP0/HP100R, ISO 9001
- Founded
- 1989
- Employees
- approx. 40
- Industries
- Renewable energy, Energy industry, Process engineering, District heating, Timber industry, Food sector
- 01
Basic Engineering
- 02
Design
- 03
Plasma cutting
- 04
Welding / vessel and steel construction
- 05
Pickling
- 06
Painting
- 07
Installation
- 08
Quality assurance (IWT, including X-ray inspection)
Materials & Processes
Steel
Material for steel structures, pressure vessels, buffer storage tanks and apparatus in plant and vessel construction.
Stainless steel
Used, for example, for paint tanks, vessels in the food sector and systems with hygiene requirements.
Plasma cutting
In-house plasma cutting for sheet metal cutting in steel and stainless steel since the new production hall in 2008.
Pickling
Own pickling plant for surface treatment of stainless steel components, in a dedicated pickling hall since 2016.
Painting
Own painting facility or paint shop for corrosion protection of steel structures (since 2016).
Locations

Mauterndorf
ATHeadquarters, engineering, production, installation
- Materials
- Steel, stainless steel
- Production hall 1,500 m² (2008)
- Plasma cutting system
- Pickling plant
- Painting and pickling hall (2016)
- X-ray inspection (IWT)
Components & Systems






Inside the production














Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Plant constructionEngineering | – | – | – | – | – |
| Vessel construction (pressure vessels, buffer storage tanks, storage tanks, mixing vessels)Welding/Joining | – | – | – | – | Steel, Stainless steel |
| Steel construction (steel structures)Joining | – | – | – | – | Steel |
| Engineering (basic engineering, design)Engineering | – | – | – | – | – |
| Installation (on-site installation, assembly supervision)Installation | – | – | – | – | – |
| Plasma cuttingCutting | – | – | – | – | Steel, Stainless steel |
| PicklingSurface | – | – | – | – | Stainless steel |
| PaintingSurface | – | – | – | – | Steel |
| Welding (certified to EN ISO 3834-2, AD 2000 HP0/HP100R, EN 1090-2, §14 Boiler Act)Joining | – | – | – | – | Steel, Stainless steel |
| X-ray inspectionTesting | – | – | – | – | Steel |
| District heating transfer stations (compact stations, custom-made units)Installation | – | – | – | – | – |
| Double-walled vessels with vacuum interlayerWelding/Joining | – | – | – | – | – |
4 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Plasma cutting system | – | – | – | 2008 | Mauterndorf |
| Pickling plant | – | – | – | 2008 | Mauterndorf |
| Painting facility / paint shop | – | – | – | 2016 | Mauterndorf |
| Production hall | – | 1 | 1,500 m² | 2008 | Mauterndorf |
Additional services
Reference customers
Quality & Certification
Quality assurance is carried out internally, among other methods, by X-ray inspection; the company is certified to EN 1090-2, AD 2000 HP0/HP100R, §14 Boiler Act and EN ISO 3834-2.
| Evidence | Mauterndorf |
|---|---|
| EN 1090-2 | |
| AD 2000 HP0/HP100R | |
| EN ISO 3834-2 | |
| §14 Boiler Act | |
| ISO 9001 |
Company History
- 1989
Company founded – takeover of the one-man business of the late friend Rupert Klingler
- 1991
Hiring of the first employee
- 1995
Relocation to Steindorf 43, 5570 Mauterndorf, as a subtenant of the company Ilbau
- 1997
Construction of the first condensation system for the heating plant Mauterndorf
- 1999
Acquisition of the property
- 2001
Start of development and production of district heating transfer stations as well as first event 'Culture in the Workshop'
- 2007
Construction of the company's own biomass heating plant
- 2008
Completion of the new production hall with 1,500 m², plasma cutting and pickling plant
- 2009
Twentieth company anniversary as well as membership in the 'Netzwerk Metall' network
- 2011
Construction of the company's own photovoltaic system
- 2015
Certification to AD 2000, EN 1090 and further standards; start of the switch to e-mobility
- 2016
Workforce of approx. 40 employees; construction of a new painting hall and a pickling hall