TPi March 2016

4-8 April 2016

Preventing pipe damage during logistics Dhatec specialises in developing and manufacturing products that protect pipes from damage during all logistics. The organisation shows pipe companies how they can guarantee safe, efficient and damage-free delivery of pipes through the entire supply chain. special sizes and extreme conditions. Dhatec also offers rental and recycling possibilities of its products to stimulate sustainability. Dhatec offers more than 3,000 solutions in the following categories: • Products for safe pipe transport, to transport a range of pipe diameters at the same time, on truck or train • Pipe storage – safe storage of line pipes can be facilitated by using Dhatec storage systems achieved with a range of pipe hooks and pipe rollers

• Pipe coating products for closure of pipes during blasting and temporary coupling during coating • Pipe preservation – pipe closure in combination with bevel protection, anti-corrosion products and stack covers to protect pipes against damage and contamination • Pipe handling – easy and efficient pipe handling and movement can be

• Pipe construction – for construction onshore, offshore and spool bases Dhatec offers products such as stalk joining clamps and masking rings

The company claims its products and technical support improve the quality, efficiency and safety of the processes, assisting project managers in organising the logistics of pipeline projects. Existing products are continuously customised to comply with the latest demands and specifications, including

Dhatec – The Netherlands info@dhatec.nl www.dhatec.nl

S t a n d n o . 4G18

Composite tubes with powerful bonding Hoesch Schwerter Profile GmbH develops its products in collaboration with specific fields of industry and customers. Modern power stations and industrial plants are just two areas where special steel solutions are used that are required to withstand the most extreme loads. subject to corrosive attack, triggered by the chemical element chlorine.

The high temperature structure steel and high alloy layer are formed simultaneously during the hot extrusion process at temperatures from 1,150°C to 1,250°C. The development of composite tubing pursued by Hoesch Schwerter Profile was undertaken with the aim of overcoming the known disadvantages of clad pipes. The carbon steel component and austenitic layer of the extrusion billet are manufactured in a common hot forming process at around 1,150°C to 1,250°C. The metallurgical connection between the two materials is achieved in the solid state using pressure- accelerated solid state diffusion. A diffusion zone approximately 10µm thick forms between the materials, which is responsible for a high-strength, oxide- free metallurgical bond of materials. The fine microstructure configuration of the layer and base material is preserved, with no variation in the alloy concentration. Smooth surface structures avoid deposition of corrosion- promoting ash and salt particles from the flue gas.

For this specific application, the conventional boiler tube used in plant construction with its proven component strength was equipped with a ‘coating’ using a corrosion-resistant austenitic material. The intention behind this combination of materials is to allow the carbon steel to handle the thermal- mechanical load on the tube, while the austenite provides protection against corrosion from the prevailing environment. ‘Combined materials’ tubing of this kind is often referred to as composite. If produced using the extrusion process, the term used to describe this is co-extruded tubing.

The classic seamless steel tube for pressure vessels is a key construction element in the building of thermal plants. The requirements for boiler construction steels become significantly more exacting if – instead of conventional boiler fuels such as coal, oil or gas – other sources of energy are used that result in strongly corrosive combustion products. For instance, boiler tubes in a waste incineration plant are not only exposed to thermal loads, but are also

Hoesch Schwerter Profile GmbH – Germany

S t a n d n o . 3B22

info@hoesch-profile.com www.hoesch-profile.com

Extruded tubing with internal and external layer

68

TUBE PRODUCTS INTERNATIONAL March 2016

www.read-tpi.com