Steam systems, pressure vessels, welded assemblies and CNC parts from our own production in Waldkirch SG.
Aerni AG
9205 Waldkirch SG, SwitzerlandNew on Amplifa
About Aerni AG
Aerni AG is a mechanical and plant engineering company in Waldkirch SG (Switzerland) that has been in existence since 1965. Its core business is turnkey steam system construction, from design via the R&I diagram and 3D planning through to manufacturing in its own production halls, on-site installation and commissioning including SVTI acceptance. The portfolio includes large water-space boilers, rapid steam generators, in-house manufactured electric steam generators of 38–100 kW, thermal oil heater systems, pressure vessels per CE1253/2014/68/EU, as well as piping construction for steam, condensate and hot water. For the medical and pharmaceutical industries, the company plans and installs clean steam systems, steam exchange stations and components such as stainless steel condensate collection vessels. In addition, Aerni AG manufactures contract welded assemblies (MAG, WIG) in small to large series from steel, chrome-nickel steel and high-strength steels, as well as CNC turned and milled parts for individual parts and small series. Materials are steel, stainless steel and mixed joints thereof.
- Site
- Waldkirch SG
- Processes
- Steam system construction (planning, manufacturing, installation, commissioning), Steam generator manufacturing (large water-space boilers, rapid steam generators, electric steam, In-house manufacture of electric steam generators, Thermal oil heater systems, Pressure vessel construction (certified per CE1253 / 2014/68/EU), Manufacture of feedwater vessels, condensate collection vessels, mixing coolers, steam distributors,, Piping construction for steam, condensate and hot water (in-house prefabrication + installation), MAG welding
- Materials
- Steel (carbon steel), Chromium steel, Chrome-nickel steel, High-strength steels, Stainless steel 1.44/1.43, Mixed joints of the mentioned steels, Chromium steel / stainless steel
- Certificates
- ISO 9001:2015, ISO 3834-2:2021, EN 15085-2 CL1, 2014/68/EU (Pressure Equipment Manufacturing), European Adhesive Bonder (EAB) per DVS/EWF 3305, CE 1253 (Pressure Equipment), 2014/68/EU (Pressure Equipment), EAB per DVS/EWF 3305, IATF 16949
- Founded
- 1965
- Industries
- Medical sector (sterilisation), Pharmaceutical industry, Food / dairies, Process industry, Vehicle and mechanical engineering, Chemicals
- 01
Consulting and needs analysis
- 02
Engineering: design, R&I diagram, 3D planning/room scan
- 03
Manufacturing in our own production halls (vessels, piping,
- 04
On-site installation
- 05
Commissioning and SVTI acceptance
- 06
Maintenance, service, operation and remote monitoring
Materials and Processes
Steel (carbon steel)
Base material for pressure vessels, steam system components and piping.
Chromium steel / stainless steel
For pressure vessels, condensate collection vessels, mixing coolers and clean steam systems in medicine and pharma.
Chrome-nickel steel
Used for MAG and WIG welded assemblies with high purity and corrosion requirements.
High-strength steels
For demanding welded constructions and mixed joints in assembly fabrication.
Stainless steel 1.44/1.43
Piping routing in the steam and condensate network, especially for clean steam.
Locations
Waldkirch SG
CHHeadquarters, production halls with manufacturing, workshop, welding and CNC area
- Lot size
- Individual parts to large series
- Materials
- Steel, chromium steel, chrome-nickel steel, high-strength steels
- CNC machines (turning/milling)
- MAG/WIG welding equipment
- Testing technology RT, VT, PT
Components and Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Steam system construction (planning, manufacturing, installation, commissioning)Plant engineering/Engineering | – | – | – | – | – |
| Steam generator manufacturing (large water-space boilers, rapid steam generators, electric steamPlant engineering/Engineering | – | – | 10 kg/h – 50'000 kg/h (steam capacity) | – | – |
| In-house manufacture of electric steam generatorsPlant engineering/Engineering | – | – | 38 kW – 100 kW | – | – |
| Thermal oil heater systemsPlant engineering/Engineering | – | – | – | – | – |
| Pressure vessel construction (certified per CE1253 / 2014/68/EU)Welding/Joining | – | – | – | – | Steel, Chromium steel |
| Manufacture of feedwater vessels, condensate collection vessels, mixing coolers, steam distributors,Welding/Joining | – | – | – | – | Steel, Chromium steel |
| Piping construction for steam, condensate and hot water (in-house prefabrication + installation)Assembly | – | – | – | – | 1.44/1.43 (stainless steel), Carbon steel |
| MAG weldingJoining | – | – | – | – | Steel, Chrome-nickel steel, High-strength steels, Mixed joints |
| WIG weldingJoining | – | – | – | – | Steel, Chrome-nickel steel, High-strength steels, Mixed joints |
| Assembly fabrication in small to large series (incl. welded constructions with machining,Assembly | – | – | – | Small series – Large series | Steel, Chrome-nickel steel, High-strength steels |
| Testing methods in-house: X-ray (RT), visual inspection (VT), penetrant testing (PT),Testing | – | – | – | – | – |
| Engineering: design, construction, R&I diagram, 3D planning/room scanEngineering | – | – | – | – | – |
| CNC machining (turned and milled parts), individual parts and small seriesMachining | – | – | – | Single part – Small series | – |
| Steam boiler service: maintenance, repair, revision, operation, conversions, remote monitoringService/Assembly | – | – | – | – | – |
| Steam rental systems (mobile rental systems)Plant engineering/Engineering | – | – | 50 kg/h – 6'000 kg/h | – | – |
| Steam flow measurement (invasive and non-invasive, clamp-on or permanently installed)Testing/Measurement | – | – | – | – | – |
| Clean steam systems for medicine/pharma: planning, installation, carbon steam/clean steam exchangePlant engineering/Engineering | – | – | – | – | Stainless steel/Chromium steel |
| Manufacture of condensate lift stations, steam reduction stations, control valve stations,Assembly/Joining | – | – | – | – | Chromium steel |
| Support during SVTI revision / acceptance by authoritiesTesting | – | – | – | – | – |
1 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| CNC machines (turning/milling) | – | – | – | – | Waldkirch |
Additional services
Reference customers
Quality and Approvals
Aerni AG works with certified welding personnel and secures weld seams in-house using X-ray (RT), visual inspection (VT) and penetrant testing (PT); pressure vessels are manufactured in accordance with CE1253 or 2014/68/EU. The quality management system is certified to ISO 9001:2015, complemented by ISO 3834-2, EN 15085-2 CL1 and the EAB adhesive bonding qualification.
| Evidence | Waldkirch SG |
|---|---|
| ISO 9001:2015 | |
| ISO 3834-2:2021 | |
| EN 15085-2 CL1 | |
| 2014/68/EU (Pressure Equipment) | |
| EAB per DVS/EWF 3305 | |
| IATF 16949 |
Company History
- 1965
Founded at the Felsenhof with a focus on general repairs.
- 1970er
First orders and expansion; first steam boiler delivered to the Hauptwil dairy, first feed stand to the Edliswil dairy.
- 1982
CH representation of Big Dutchmann (Germany) for feeding controls; expansion into steam boiler systems and pig feeding systems.
- 1988
Development of the first mobile steam system.
- 1994
Move into the new building at Brüelstrasse 8 in Waldkirch.
- 1998
Introduction of the first CNC machines.
- 2000
Takeover by daughter and son-in-law (Hansjörg Müller); introduction of the profit centre organisation (agriculture, industry, manufacturing).
- 2010er
Investment in modern CNC machines; expansion of the portfolio to include vessel construction, piping construction and planning.
- 2020
Takeover by Jan Siegmund and Levin Schmid; closure of the agricultural engineering division; focus on steam system construction, contract manufacturing of assemblies and CNC manufacturing.