EXPANSION JOINTS FOR
EXHAUST GAS CLEANING
(SCRUBBER)

Belman has vast experience in design and manufacture of expansion joints for exhaust gas cleaning (scrubber). Exhaust gas cleaning systems are also known as scrubbers, scrubber systems, wet gas scrubbers, exhaust gas scrubbers among many other designations. No matter the designation, it has the same purpose; to control air pollution by cleaning the exhaust gas. Belman delivers expansion joints that ensure ship owners, shipyards and maintenance crew smooth, optimum and reliable operation their exhaust gas cleaning systems in order to meet the emission limits of allowable emission in low emission zones.

Various sizes and types – Customised solutions
Type and size of Belman Expansion joints for exhaust gas cleaning are determined by the dimension of the scrubber and its piping/duct work. Furthermore, the shape of piping on scrubber inlet and outlet and the design and type of the scrubber determines the type of expansion joint needed. The design of the expansion joint is specified by the amount of movements in the system.
Diameter, installation length and design criteria can be changed upon customer’s request and are available in all sizes up to DN 12.000, all designs and all materials.

Materials:

• 1.4541
• 1.4404
• 254 SMO
• Duplex
• Superduplex
• Other materials are also available on request

As the scrubber can be susceptible to damage from vibrations and movements, the installation of expansion joints is required to protect the scrubber and connected equipment. The expansion joints are therefore placed at different locations around the scrubber. No two scrubbers look exactly the same and are designed and manufactured in many different ways. In most cases an expansion joint is placed at the inlet and a second one is positioned at the outlet.

For most applications, the expansion joints used are single bellow or double bellow expansion joints with flanges. The movements they are to absorb are typically axial movements.

Belman Expansion joints for exhaust gas cleaning (scrubber) are typically installed in various exhaust cleaning system types on board marine vessels, such as:

• Cruise liners
• Container ships
• Ferries
• Cargo ships
• Freighters
• Passenger ships
• Oil tankers etc.

Bellows for different scrubber designs
No matter what the design, Belman excels in customizing the expansion joints for the exact scrubber specification, such as demonstrated in this passenger ship project. The expansion joints for scrubbers are typically made from 1.4541 or 1.4404 (most often located at the inlet) and 254 SMO or duplex or super duplex – these materials are often specified when sea water is used for cooling (most often located in the outlet). The media and the operating criteria of the process/scrubber of course determines the material of the expansion joints. The exhaust gas that is fed into the scrubber is dry and heated and therefore AISI 316L is sufficient. However, when the media exits the scrubber it has cooled and can be wet/humid with acidic properties. For these reasons the expansion joint is made from 254 SMO and since the media in most situations has the possibility to run-back the expansion joint is further equipped with an inner sleeve also made from 254 SMO.

Belman design and manufacture expansion joints for both new build and retrofit projects. Our customers benefit from Belman’s product expertise and our ability to deliver customized solutions with short lead times.