About Röhrenwerk Carl Hamm GmbH
Pipeline Constructor and Certified Welding Specialist with Tradition
What do we do?
The steel construction industry has many players. But where others offer only standard solutions, Carl Hamm goes a step further: When needed, we develop individual components as well as complex systems for all types of plants—and manufacture them in-house with the highest quality.
For our customers, this means: one point of contact takes care of everything—from the initial concept and production to expert welding and smooth, on-time delivery.
We place great value on exceptional quality, customer orientation, and innovation, ensuring that our piping systems are reliable, efficient, and tailored to our customers’ needs.
The company is currently managed by the managing partners Sebastian Hamm and Philipp Hamm, who continue the legacy of innovation and quality.
Our Piping Systems
We manufacture piping systems ranging in diameter from 17.2 mm to 2,000 mm and pressure ratings from PN 2.5 to PN 400, using various steel grades for the following applications:
Our Machinery
Our modern machinery enables a wide range of precise manufacturing processes. For material handling, we use overhead cranes with a capacity of 5 tons each, forklifts with lifting capacities ranging from 1.8 to 6 tons, and a heavy-duty roller system capable of handling up to 10 tons. Marking is performed using computer-controlled hard stamping and inkjet systems.
Mechanical Processing includes CNC lathes (turning diameter up to 500 mm, turning length up to 800 mm), conventional lathes (up to 1,000 mm diameter), NC milling machines, and vertical machining centers with travel distances of 1,000 x 600 x 600 mm.
Welding Capabilities include tank turning devices (DN 500–DN 3000, load capacity up to 10 tons), MAG welding machines (up to 400 A), mechanized welding systems for pipes (up to DN 1,400, length up to 16 m), as well as TIG and orbital welding equipment.
Cutting Systems feature band saws (up to DN 500), orbital saws (⌀15.5–⌀114.3 mm), and CNC plasma and oxy-fuel pipe cutting systems (up to DN 1,600). Our equipment is further enhanced by a sandblasting unit, plate rolling machines (bending capacity up to 20 mm, length 2.5 m), and hydrostatic test benches (up to 600 bar and 320 tons of elongation force).
For incoming goods inspection, we use state-of-the-art measuring devices such as the FARO 3D measuring arm (Fusion 12 ft, 7 axes), as well as hardness testers and wall thickness gauges.
Welding
As a specialized welding company, we are, of course, certified according to current regulations.
A wide range of procedure tests has been carried out, and personal certifications are available for MAG, TIG, submerged arc, and automated welding.
Submerged Arc Welding
This method ensures high weld seam quality and excellent protection against external influences. It is particularly well-suited for thick-walled components. Thanks to its automated process, it enables both high welding speeds and precise seam formation.
Orbital Welding
This process guarantees precise weld quality through continuous, uninterrupted operation. It is especially suitable for applications requiring hygienic standards and minimal tolerance for seam defects. It enables efficient production and high repeatability.
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Testing
Inhouse
Our in-house quality control is carried out by certified specialists according to DIN EN ISO 9712, Level 2. To ensure continuous monitoring of product quality, various testing methods in compliance with applicable standards are employed. These include non-destructive testing (NDT) of weld seams in accordance with the general principles of DIN EN ISO 17635. Specifically, this includes visual testing (VT) according to DIN EN 13018 and DIN EN ISO 17637, dye penetrant testing (PT) as per DIN EN ISO 3452-1, as well as magnetic particle testing (MT) in accordance with DIN EN ISO 9934-1 and DIN EN ISO 17638. We also perform radiographic testing (RT) based on DIN EN ISO 5579 and DIN EN ISO 17636. To ensure pressure resistance, we additionally conduct hydrostatic pressure tests using cold water.
External
Our external testing procedures are conducted using state-of-the-art technology and in accordance with the highest standards. Automatic ultrasonic testing (UT) of pipes is performed in compliance with DIN EN ISO 10893, offering a reliable method for detecting material defects. Manual ultrasonic testing (UT) is conducted according to DIN EN ISO 16810 and DIN EN ISO 17640, allowing for precise evaluation of specific areas or critical weld seams. Additionally, we carry out destructive testing tailored to our customers’ specific requirements. These tests provide detailed insights into mechanical properties, stress limits, and the overall suitability of the material for its intended application
Construction and Development
Inhouse
Technical drawings are created precisely according to customer specifications, using both 2D and 3D production formats. Product development is always carried out in close coordination with the customer to ensure tailored solutions. We also offer support in selecting suitable joining methods and provide comprehensive consulting on the predefinition of wall thicknesses and materials to achieve optimal results in both production and application.
External
We work closely with engineering firms to successfully implement individual requirements and projects. This includes material specification and wall thickness calculations to ensure maximum stability and efficiency. Our range of services also covers detailed planning and precise FEM (Finite Element Method) calculations to perform complex load and structural analyses and develop optimal solutions for our customers.
Quality Control
Our company has been ISO 9001 certified for many years and currently meets the requirements of ISO 9001:2015. In addition, we are certified according to DIN EN ISO 14001 for our environmental management system, underscoring our commitment to sustainability and environmental protection. Preparations for certification according to DIN ISO 45001, the occupational health and safety management system, are already well underway. Certification is expected to be completed by December 2024.
Our Locations
Essen
Our company is supported by an efficient organization and modern production capabilities. With a total of 105 employees—30 in administration and 75 in production—we cover a wide range of tasks. On a total site area of approximately 40,000 m², we operate with 12,000 m² of covered production and storage facilities, as well as 15,000 m² of outdoor storage space.
We maintain separate production halls for stainless steel and carbon steel to ensure the highest standards of quality and cleanliness. Additionally, we operate a shielded X-ray bunker that enables continuous weld seam inspection, ensuring uninterrupted quality control and compliance with all standards.
Johannesburg
Our site includes an administrative and service station with approximately 2,000 square meters of office and workshop space. Our team consists of 7 full-time employees and 4 part-time staff. We run a repair workshop specializing in the maintenance of pumps from companies represented by Carl Hamm PPS. Furthermore, we maintain a fully equipped workshop to carry out service and assembly work directly on-site.