ON-SITE JOB Belman carries out assembly work as a service to our customers. As a rule, this will be in connection with clamshell bellows, although it may also be in connection with the replacement, repair and/or installation of standard type compensators or parts of existing compensators.
Why assembly? Compensators and bellows are moving parts that are designed to absorb movement on the basis of predetermined design parameters. In order to achieve maximum service life, pressure resistance and reliability, it is vital that installation is performed properly. Having Belman carry out the installation, replacement and/or repair may put some customers' minds at rest. This is because Belman is experienced when it comes to handling and welding bellows and compensators and our staff have considerable experience in the field. This means that customers can be certain that an installation has been carried out properly and in accordance with instructions. Similarly, a customer may ask Belman to carry out assembly work because of the complexity of the installation, replacement and/or repair job.
Assembly at a chemical plant Most recently, Belman carried out assembly work at a chemical plant in China. The job involved replacing the bellows and inner sleeves of 6 lateral double compensators for the world's largest producer of plastic granulate (a raw material used in plastic production). The Chinese factory accounts for 80% of world consumption of this material. So the production system involved is large indeed. The compensators, the bellows and inner sleeves of which now needed replacing, were supplied by Belman several years ago. The compensators are fitted to gas turbines, of which the plant has three. One DN 800 mm compensator is located at the inlet of two of the gas turbines and two NB 1500 units at each of the two outlets. That is to say six compensators in all. The first stage of the job involved disconnecting the piping system from the compensators. Then the existing bellows and inner sleeves were removed and the new ones prepared for insertion and finally, the new bellows and inner sleeves were welded into place and the piping system reconnected. Belman's technicians were assisted during the process by Chinese staff at the chemical plant.
Technical data The technical data of the compensators on which replacement work was carried out are as follows: Dimensions: NB 1500 and NB 800. Built-in length: 920 mm and 1180 mm. Medium: Exhaust. Design temperature: +450ºC. Design pressure: 2 bar and 11 bar. Movements: Lateral movement: +/- 30 mm and +/- 40 mm. Material: Bellows: W.1.4404. Tie rods: W.1.4404. Flanges: W.1.4404. Inner sleeves: W.1.4404.
