Avoiding specification traps in maritime waste water and waste systems
In ship design, it is often the small lines in a specification that determine how much flexibility remains later in the project. What appears to be a minor technical requirement can influence layout decisions, supplier competition, installation complexity and long-term operating cost.
When specifications become too narrow too early, the project can effectively lock itself up, reducing technical freedom, increasing risk, and limiting the ability to choose the most suitable solution once the vessel moves from concept to detailed engineering.
This is particularly visible in waste water and waste systems, where physical integration and operational realities quickly expose design constraints.
When space defines the solution
For biological wastewater treatment systems, space and accessibility are decisive parameters. In retrofit projects, especially, the available room may already be defined.
“You cannot simply exchange one system for another if the physical space is limited. We have seen installations where the unit is five to ten metres long. If the new system does not fit the existing footprint, you are suddenly looking at structural modifications,” says Michael Fønss Møller, Sales Manager at Atlas Incinerators & G&O Bioreactors.
In extreme cases, late design decisions can mean cutting steel or altering bulkheads — measures that significantly increase cost and complexity. The lesson for naval architects is clear: footprint, access routes, and service space must be considered early. A system that fits the general arrangement on paper must also work in practice, with sufficient room for maintenance and future adjustments.
The lock-out effect in incinerator specifications
In incinerator projects, the risk often lies in overly specific component requirements. “One example is the flue gas fan. If the specification names a very specific make and model without allowing for equivalent solutions, it can effectively lock out alternatives,” says Michael Fønss Møller.
The wording of a requirement can therefore determine whether competition remains open or becomes restricted to a single design philosophy. A more flexible formulation – allowing equivalent solutions in accordance with the maker’s design – preserves technical integrity while avoiding unnecessary constraints.
Designing for flexibility
For both system types, the underlying principle is the same: clarity without rigidity. Naval architects must define performance requirements, interfaces, and compliance criteria. At the same time, leaving room for technically equivalent solutions can prevent costly redesigning later in the process.
From G&O’s perspective, early dialogue is the simplest safeguard. “If we are involved before the specification is finalised, we can highlight where a requirement may unintentionally limit the project. That is easier than trying to change it once the design is frozen,” Michael Fønss Møller says.