Complete vapor-space encapsulation by both steel and fabric
The unique design of the Sealmaster is different from traditional mechanical shoe seals in that there is no shoe-to-fabric joint. With the Sealmaster, both the metallic compression plates and the vapor barrier fabric extend from the floating roof rim down into the liquid. Since the vapor barrier is spliced by heat welding, the resulting system is a gas-tight encapsulation of the entire vapor space.
Fully hardened compression plates
A critical aspect of the Sealmaster material selection is the compression plate system — comprised of fully hardened stainless steel which will not yield under compression or operating friction. This ensures long-lasting, reliable performance when compared with competitive models that use non-hardened plates.
Abrasion-resistant stainless-steel plates
Sliding parts in contact with the tank shell are wear resistant and the vapor barrier is protected from exposure to the tank shell.
Continuous compression system
The Sealmaster keeps the floating roof centered, dampening horizontal movement so the floating roof will not be blocked and the rim seal does not get squeezed in between the floating roof and the tank shell.
Can be designed to EEMUA or API working range standards
The R(-X/+3X) design working range feature is an HMT innovation. Under all circumstances, the Sealmaster rim seal will stay in contact with the tank shell. Or, if you prefer to use the API +/- 4” standard, the Sealmaster can also be designed to these parameters.
The stainless steel compression plates and PTFE vapor barrier comprise a virtually noncombustible assembly that prevents rim fires and keeps your floating roof safe (vapor barriers tested in accordance with DIN 22100/22188).