6.3.5 LP cylinders
Steam connections to LP casings are made with bellows pieces to accommodate differential expansions. The bellows are short sections of pipe with thin corrugated walls, allowing relative movements of the ends in both longitudinal and transverse directions.
With underslung condensers, a rigid bolted joint can be used between the LP outer casing and the condenser, the condenser being mounted on springs to support its weight but allowing the required flexibility. Bellows can be used on the exhausts with a floor-mounted condenser but are inconvenient because of the large area of the exhausts and because the bellows, being flexible, transfer the vacuum forces to the cylinder and condenser foundations.