Bellows sealing arrangement

A heat exchanger having a plurality of aligned ceramic heat exchange tubes mounted in an area for exchanging heat between a passageway defined within said aligned tubes and the outside of said tubes,

• an elongated bellows substantially axially aligned with said tubes and having a first end fixed to a mounting means,
• a system tube passing within said bellows and fixed to said bellows at said first end and defining a fluid chamber between said system tube and bellows,
• said system tube being aligned with said ceramic heat exchange tubes to allow through passage of fluid under pressure,
• means for permitting equalization of fluid pressure between pressure within said system tube and pressure within said chamber,
• said bellows arrangement being axially expandable upon pressurization so as to exert pressure on said heat exchange tubes related to the pressure in said chamber and to act to seal joints therebetween.