Greater strength and higher pressure rating:
The heavy duty metal reinforcing rings embedded in the carcass and arch provide additional hoop strength, increasing the ability to withstand higher external and internal pressure rating
Fully engineered and field proven:
All type 21EP have been engineered and tested in factory to ensure long life time and reliable service.
Bolt hole lining:
Totally rubber lined bolt holes prevent water from penetrating into the carcass through the holes and protect fabric and metal reinforcements in carcass, resulting in longer service life and durability.
When expansion joint piping system is submerged in water and the medium is conveyed through the pipe line, the expansion joint is subject to internal and external pressures as arch element is externally pressurized. Therefore, the joint in this pipe line must be engineered and designed to withstand external pressure as well as internal one and also to be suitable for vacuum service.