REFRACTORY LINED EXPANSION JOINT

Typical Expansion Joint solution for a Steel Plant

Do you know these facts about typical expansion joint designs for a steel plant?. Let’s discuss this from a real-life solution that we delivered to one of our repeating customers.
We have been a trusted partner for manufacturing Expansion Joints for steel plants for many years. There are typical Expansion Joint designs that are using widely across steel plants with customization according to client requirements. Following case is a best example of a typical design applicability of expansion joints and the benefits for steel plant requirements.
Below shown expansion joint has been manufactured for a repeating order from one of our best clients in Germany. This is a DN 2200 unit designed for a steel plant and installed in a hot blast pipeline near the blast furnace.

The Expansion Joint design applicability for a steel plant

This expansion joint has been customized for the application by ensuring the installation and operating conditions of the steel plant.  Design calculations for the expansion joint construction was made in accordance with AD-B13-2011. Moreover, it is designed to absorb several types of movement simultaneously, including; axial, lateral and angular movements. Also, this design incorporates a double bellow construction with tie rods to assist further controlled absorption of the movements in the pipeline. There is a conical end at the top of the expansion joint due to the different sizes of the connecting pipes on each side of the expansion joint. Due to the medium’s high temperature, the inner sleeve is made from the heat resistant austenitic steel 1.4828, and the bellow is made from 1.4571.

Refractory Lining

A typical expansion joint design for a steel plant could consist of a refractory line solution as per the insulation requirements, mainly due to the pipeline on the installation point of the steel plant being usually refractory lined to reduce the temperature. Refectory lining is a certain level of cost-effective solution i.e. if there is protective insulation from the high temperature medium, the pipes and installed components would have to be produced from high alloy steel, which could result for a high material cost. Therefore, many such pipelines are made from regular stainless steel and then refractory lined to avoid the high-cost factor. For this project, the refractory lining was carried out by industry experts as per the specifications of the client.

The thing to think:

SINGLE PLY or MULTIPLY BELLOW DESIGN?</h2

It is a very popular design for steel plants to make a butt weld between bellows and pipe ends using a single ply bellow design. However, single ply bellow designs are quite traditional that used widely in the past by many manufacturers. Now, it is more common to use multiply bellows instead. Moreover, there could be advantages and disadvantages from the end user’s perspective.
What advantages and disadvantages do you see in the single-ply butt weld design vs multiply design ?. Would you like to share your knowledge with us?.
Then, you are kindly invited to participate in our open discussion here in Linkedin: https://dk.linkedin.com/company/belman-expansion-joints

Design parameters

• Dimension: DN 2200 • Length: 1888 mm • Design temperature: 300°C • Design pressure: 3,3 barG • Media: Gas • Bellows: 1.4571 • Inner sleeve: 1.4828 • AX:  +0/-30 mm • LA:  +/-2 mm • AN:  +/-1° • Design code: AD-B13:2011

Typical Expansion Joint solution for a Steel Plant