Independent structure
The deck support system is designed as a structural system rather than relying on pontoons to act as primary beams.
Engineered products
EZroof NC
Non-contact aluminium skin-and-pontoon internal floating roof
A deliberately robust non-contact IFR for applications where a skin-and-pontoon concept is the right answer — engineered around independent structure, reliable buoyancy and control of the vapour space beneath the deck.
Design intent
If the roof is non-contact, design for the physics of a non-contact roof.
A non-contact IFR contains vapour that has already formed beneath the deck. Escaped vapour is replenished by evaporation from the liquid surface below, so deck seams, penetrations and the integrity of the vapour envelope have a different significance than on a true full-contact roof.
EZroof NC is not positioned as the cheapest way to place aluminium above a liquid. The structural frame, pontoon arrangement, deck skin, fittings and process conditions are engineered so that the roof remains stable and buoyant without depending on fragile assumptions.
In practice
Non-contact roof construction
These archive photographs show typical skin-and-pontoon construction and structural arrangements. EZroof NC is engineered from the actual tank geometry, process conditions and required buoyancy margin.
Engineering priorities
What the design has to get right.
Buoyancy margin
Pontoon size, spacing, compartmentalisation and local loads are checked for the complete operating configuration.
Vapour envelope
Deck skin, seams, penetrations and rim sealing are treated as a containment system.
Process resilience
Filling, pigging, mixers, gas slugs and inlet conditions are considered before the roof is released for service.
Scope
Typical engineered configuration
- Aluminium structural frame with skin deck
- Project-selected aluminium pontoon system and buoyancy verification
- Perimeter rim, legs, anti-rotation and electrical bonding
- Rim seal selected to match the roof and measured tank geometry
- Penetrations, wells, vents and fitting seals
- Diffuser review where pigging, high inlet velocities or gas slugs may occur
Inputs
Application inputs
- Tank geometry, internal columns and roof-support arrangement
- Product properties and expected vapour pressure
- Maximum fill and withdrawal rates
- Pigging / gas-slug exposure and inlet arrangement
- Required seal type and secondary-seal height
- Inspection, landing, maintenance and access requirements
Standards & project basis
Designed from the application, then checked against the code.
EZroof NC is engineered against the applicable internal-floating-roof requirements for the project, typically including API 650 Appendix H together with the relevant material, fire-protection and site standards.
Related products
Part of the same tank system.
Application review
Start with the tank, the service and the result you need.
Emission Zero can review the application before turning it into a product configuration or project specification.