Secondary Compression Plate Seal “U” (CPU)

The Secondary Compression Plate Seal “U” (CPU) is a rim mounted sealing system for floating-roof tanks of any size storing all grades of crude or refined products. Its design allows installation while the tank remains in service, minimising downtime.

Each seal incorporates a robust compression plate, a synthetic rubber wiper and a vapour-barrier membrane. The compression plate can be supplied in galvanised or stainless steel, while the membrane is typically made from polyurethane-coated nylon fabric with very low vapour-permeability properties. Depending on your requirements, alternative materials such as PVC Nitrile, PTFE/Teflon or Firestop can be specified.

All fixings are located on the outside of the seal, leaving the tank-shell side completely smooth to reduce the risk of damage when the roof floats above the shell. The Secondary Compression Plate Seal “U” (CPU) can be attached to either a vertical upstand or a horizontal angle, and the compression-plate dimensions can be adjusted to suit a wide range of nominal rim spaces.

Material Specification:

Compression Plate and Clamp Channels:
Galvanised / Stainless Steel

Wiper:
Synthetic rubber – high tensile strength good wear resistance, excellent weathering

Vapour Barrier:
Teflon (Fiberglass) / Calcium Silicate / Urethane / Polyurethane.

Shunts:
Stainless Steel

Typical Service Life:
10-20 years

Technical data:

Rim space:
200 mm ± 100 mm (standard)

Aromatic resistance:
100%