KRAH Technology
Discover the core of Krah USA's leadership in large HDPE pipe: our one-of-a-kind, state-of-the-art manufacturing technology. This isn't just advanced; it's a revolutionary, innovative system that sets us apart. We are currently the only USA HDPE pipe manufacturer capable of producing pipe in this unique and highly efficient way, allowing us to achieve unprecedented precision, superior structural integrity, and custom diameters unmatched by conventional methods. This proprietary technology ensures every pipe we deliver meets the highest standards for your most challenging projects.
Why Choose Krah USA?
Quality & Development
We work with the highest quality standards,
from project to construction
Quality defines our operations here at Krah USA. It is one of our fundamental pillars and what sets our products and services apart from the rest. Our quality system is based on constant training for our staff, the traceability of each product unit and the certification of our processes, in addition to the constant support of our clients.
How do we do it?
Through original software, our quality system ensures traceability for each unit of product. In the profile development stage, all initial tests are carried out to achieve the Technical Aptitude certificate issued by Bureau Veritas.
Once the Technical Aptitude has been achieved, each unit produced has a registration number engraved on the shaft and a barcode label that guarantees the traceability of the entire production process, including, among others:
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Raw material used
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Manufacturing date
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Equipment parameters
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Responsible in charge at each stage of the process
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Specifications, tests and measurements
This entire control system is based on the requirements of the application standards of each line, and it has the certification of Bureau Veritas by lot referenced to each product registration.
Joining Technology
Joining technology built into your custom solution
Krah's production technology employs a helical extrusion (spiral wound) process capable of crafting profiled pipes for gravity applications, solid-wall pressure pipes, and a wide array of special wall structures, including fittings, manholes, and accessories.
Electrofusion
Meet our flagship joining technology, Electrofusion. The whole pipe system becomes a homogenous unit. A welding wire, which is integrated into the socket or spigot is heated with the help of a special welding device whereby the two pipe ends (socket and spigot) are joined together. The electro-fusion jointing technique is a very favorable, simple and safe method to install pipes in even very narrow trenches in a short time. For further information please refer to our special brochure "E-fusion".
Extrusion Welding
The pipes and/or fittings which are to be connected are jointed by a socket and spigot joint. Similar to a V-seam connection, the two pipe ends are connected with the help of an extrusion welding device. The jointing can be carried out inside and/or outside of the pipe. This jointing is most suitable for low-pressure gravity pipes and manholes. The welding has to be done according to DVS 2207 part 4.
Butt Fusion
The pipes and fittings are joined with the help of a heating element Butt Fusion Machine. The ends of the pipes and fittings are butt-fused. This kind of jointing method is only recommended for pipes and fittings with a maximum wall thickness of 5,9 in. (150 mm) and with diameters from DN/ID 12 in. (300 mm) to DN/ID 118 in. (3000 mm). The welding has to be done according to DVS 2207 part 1 or equivalent welding standard.
Flange Connection
The ends of the pipes and fittings are joined with the help of a steel flange and a rubber gasket. Depending on the type of pipe, the flange adapters are completely manufactured from the pipe, or the flanges are available as separate fitting. This kind of jointing method is mostly used for open sea discharge applications and for tank connections. The greatest advantage of this connection is the facility of disjointing.
Gasket Connection
The Krah rubber sealing system consists of a solid plain bell and spigot, with integrated EPDM gaskets. The special double gasket design of Krah provides maximum safety for leak-free joints. Gaskets can be an alternative solution if detachable connection or a temporary joint is requested.
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