Penetration seal expansion bellows were designed to address the many
problems associated with penetrating the shell of a boiler or similar
pressure casing. Traditionally, when a tube or pipe penetrates the
casing, a slip joint packed type seal is used to allow the tube or
pipe to thermally expand and contract without damaging the surrounding
shell or pressure casing. The packing material in this joint is used
to help reduce the escape of heat and gas from the boiler. However,
these designs have many drawbacks. They require constant adjusting
to keep the seal from leaking excessively.
Because slip joint type
packed seals cannot be insulated, imposed stress on the tubes will
eventually cause the unit to leak and become so hot that maintenance
personnel are unable to get close enough to adjust them. Penseal bellows
offer a complete seal that eliminates the leakage of heat and other
emissions, reduces noise, and protects maintenance personnel. These
seals can be completely insulated which ensures the least amount of
heat loss at the point of penetration as well as helping to cool the
casing area around it.
Because PenSeal is a true expansion joint, it
is designed to accept axial, lateral and angular movements, therefore,
lowering the stress on the tubes and pipes they are attached to. Lastly,
and most importantly, PenSeal is maintenance free. Install it and forget!
Penseal